Document:

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                                                                 EXHIBIT 4.16

                         COMMON STOCK PURCHASE AGREEMENT

     This Common Stock Purchase Agreement (this "AGREEMENT" ) is made as of this
28th day of April, 2000 by and between American Bio Medica Corporation, a New
York corporation (the "COMPANY"), and Seaside Partners, L.P., a Delaware limited
partnership (the "INVESTOR").

     THE PARTIES HEREBY AGREE AS FOLLOWS:

     1.   PURCHASE AND SALE OF CONVERTIBLE PREFERRED STOCK.

          1.1  Investment by the Investor. Subject to the terms and conditions
of this Agreement, at the Closing (as defined below), the Company will issue and
sell to the Investor, and the Investor will purchase from the Company, an
aggregate of 1,408,450 common shares, par value $0.01 per share, of the Company
(the "COMMON STOCK") at a purchase price per share equal to $1.42 (the "CLOSING
PRICE"), for an aggregate purchase price of $2,000,000 (the "INVESTMENT
AMOUNT"). The Common Stock, together with the Warrants and the Warrant Shares
(each as defined below) are collectively referred to as the "SECURITIES".

          1.2  Closing. The purchase and sale of the Common Stock (the
"CLOSING") shall take place at the offices of Buchanan Ingersoll Professional
Corporation, 650 College Road East, Princeton, New Jersey 08540 at 10:00 a.m. on
April 28, 2000, or such other date as the parties may mutually agree (the
"CLOSING DATE").

          1.3  Use of Proceeds. The Company will use the proceeds from the sale
of the Common Stock solely for the purposes set forth on SCHEDULE 1.

     2.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company hereby
represents and warrants to the Investor, except as disclosed on the Schedule of
Exceptions attached hereto as SCHEDULE 2, such disclosures specifically
identifying the subsection of this SECTION 2 that they modify, as follows:

          2.1  Organization, Good Standing and Qualification. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of New York. The Company has all requisite power and authority to
carry on its business as now conducted and as proposed to be conducted. The
Company has all requisite power and authority to enter into and perform this
Agreement and the transactions contemplated hereby and is duly qualified to
transact business and is in good standing in each jurisdiction in which the
failure so to qualify could have a material adverse effect on its business,
properties, operations, earnings, assets, liabilities, condition (financial or
otherwise) or prospects (collectively, "CONDITION").

          2.2  Capitalization.

               (a)  After giving effect to the transactions contemplated by this
Agreement, and immediately after the Closing, the capital stock of the Company,
as authorized by its Certificate of Incorporation, will consist of: (i) an
aggregate of 5,000,000 authorized 8% Series D Convertible Preferred Shares,
$0.01 par value (the "SERIES D STOCK"), no shares of

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which shares are issued and outstanding; (ii) an aggregate of 30,000,000
authorized common shares, par value $0.01 per share, of which (A) 18,045,548
shares will be validly issued and outstanding, (B) 1,263,142 shares will be
reserved for future issuance to key employees, non-employee directors and
consultants of the Company under the Company's Fiscal 1997 Non-Statutory Stock
Option Plan; (C) 985,000 shares will be reserved for future issuance to key
employees, non-employee directors and consultants of the Company under the
Company's Fiscal 1998 Non-Statutory Stock Option Plan; (D) 1,000,000 shares will
be reserved for future issuance to key employees, non-employee directors and
consultants of the Company under the Company's Fiscal 2000 Non-Statutory Stock
Option Plan; (E) 250,000 shares will be reserved for future issuance to Dr.
Steiner under that certain Consulting Agreement dated December 31, 1999 between
Dr. Steiner and the Company; (F) up to 2,134,016 shares (the "WARRANT SHARES")
will be reserved for issuance upon exercise of the Warrants (as defined below)
and (G) 309,342 shares will be reserved for future issuance upon exercise of
certain other outstanding warrants. The rights, privileges and preferences of
the Series D Stock and the Common Stock are as stated in the Company's
Certificate of Incorporation.

               (b)  Except for Common Stock reserved for issuance as described
in SECTION 2.2(a), as of the Closing, the Company will not (i) have outstanding
any capital stock or other securities convertible into or exchangeable for any
shares of its capital stock and, except as otherwise contained in the
Certificate of Incorporation or pursuant to the terms of any of the Purchase
Documents (as defined in SECTION 2.3), no person will have any right to
subscribe for or to purchase (including conversion or preemptive rights), or any
options for the purchase of, or any agreements providing for the issuance
(contingent or otherwise) of, any calls, commitments or other claims of any
character relating to, any capital stock or any stock or securities convertible
into or exchangeable for any capital stock of the Company; (ii) have any capital
stock, equity interests or other securities reserved for issuance for any
purpose; or (iii) be subject to any obligation (contingent or otherwise) to
repurchase or otherwise acquire or retire any shares of its capital stock or any
convertible securities, rights or options of the type described in the preceding
clause (i). All of the issued and outstanding shares of Common Stock and Series
D Stock have been duly and validly issued and are fully paid and nonassessable
and all of the shares of Conversion Stock and the Warrant Shares, when issued as
contemplated hereby, will be validly issued, fully paid and nonassessable. To
the best knowledge of the Company, there are no agreements among the Company's
stockholders with respect to the voting or transfer of the Company's capital
stock, other than the agreements contained herein. SCHEDULE 3 attached hereto
includes a complete and correct list of the name of each of the Company's
current or former officers, directors, employees or Persons that beneficially
own in excess of 5.0% of the outstanding equity interest of the Company (each, a
"PRINCIPAL OWNER") and the number of shares of Common Stock owned by each such
Principal Owner as of the Closing Date.

          2.3  Authority; Execution and Delivery; Requisite Consents;
Nonviolation. The Company has, and as of the Closing will have, all requisite
power and authority to execute, deliver and perform this Agreement and each
other document or instrument executed by it, or any of its officers, in
connection herewith or therewith or pursuant hereto or thereto (this Agreement,
together with all of the foregoing documents and instruments, are sometimes
collectively referred to herein as the "PURCHASE DOCUMENTS"), and to consummate
the transactions contemplated hereby and thereby. The execution, delivery and
performance of this Agreement and the other

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Purchase Documents and the consummation of the transactions contemplated hereby
and thereby have been duly and validly authorized by all necessary action on the
part of the Company. This Agreement and each of the other Purchase Documents
that has been executed as of the date hereof are, and each of the Purchase
Documents will be as of the Closing, duly executed and delivered by the Company
and the legal, valid and binding obligation of the Company, enforceable against
the Company in accordance with its terms, except as the enforceability thereof
may be limited by bankruptcy, insolvency or other similar laws affecting the
enforceability of creditors' rights in general or by general principles of
equity. The execution, delivery and performance of this Agreement and the other
Purchase Documents, the consummation by the Company of the transactions
contemplated hereby and thereby (including, without limitation, the offer, sale
and delivery by the Company of the Securities) will not: (a) require the
consent, license, permit, waiver, approval, authorization or other action of, by
or with respect to, or registration, declaration or filing with, any court or
governmental authority, department, commission, board, bureau, agency or
instrumentality, domestic or foreign ("GOVERNMENTAL AUTHORITY") or any other
individual, partnership, corporation, unincorporated organization or
association, limited liability company, trust or other entity (collectively, a
"PERSON"); (b) violate or conflict with any provision of the Certificate of
Incorporation or the By-laws of the Company, complete and correct copies of
which have been provided to counsel to the Investor; or (c) constitute a default
(with or without the giving of notice or lapse of time or both) under, violate
or conflict with, or give rise to a right of termination, cancellation or
acceleration or to a loss of a material benefit under any Law (as defined in
SECTION 2.6), Permit (as defined in SECTION 2.6), Order (as defined in SECTION
2.5), or contract, agreement, arrangement or understanding, written or oral, to
which the Company is or hereafter may be a party to or by which the Company or
its properties are or hereafter may be bound.

          2.4  Subsidiaries. The Company has no subsidiaries and does not, and
prior to the Closing will not, own or control, directly or indirectly, any
partnership interests, stock or other equity interests in any partnership,
corporation or other entity or any voting rights or right to control the
policies and direction of any partnership, corporation or other entity.

          2.5  Litigation. There is no action, suit, proceeding, investigation
or governmental approval process (collectively, "ACTIONS") pending or, to the
best knowledge of the Company, threatened against it, or affecting any of its
properties or assets (including, without limitation, any of its Permits) which
individually or in the aggregate could have a material adverse effect on its
Condition, nor is there any basis for any such Action. To the best knowledge of
the Company, there is no Action against any of its directors, officers or
employees in connection with its business which, in the event of an adverse
judgment against any such Person, could have a material adverse effect on the
Condition of the Company, nor is there any basis for any such Action. The
foregoing includes, without limitation, any Action pending or, to the Company's
best knowledge, threatened (or any basis therefor known to the Company)
involving the prior employment of any employees of the Company, their use in
connection with the business of the Company of any information or techniques
allegedly proprietary to any of their former employers, or their obligations
under any agreements with prior employers. Neither the Company nor any of its
assets or properties, nor, in connection with its business, to the Company's
best knowledge, any of its stockholders, directors, officers or employees, is
subject to any order, judgment, writ, injunction, decree, ruling or decision
(collectively, an "ORDER") of any

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Governmental Authority which is material to the Condition of the Company. There
is no Action by the Company currently pending or which the Company intends to
initiate which is material to its Condition.

          2.6  Compliance with Laws; Permits. Assuming the accuracy of the
representations made by the Investor pursuant to SECTION 3, the offer and sale
of the Securities to the Investor will be in compliance with all applicable
federal and state securities laws. The Company has not violated or failed to
comply with, in any material respect, any statute, law, ordinance, rule,
regulation or policy of any Governmental Authority (collectively, "LAWS") to
which it or any of its properties or assets is subject. The Company has all
permits, licenses, orders, certificates, authorizations and approvals of any
Governmental Authority (collectively, the "PERMITS") that are material to the
conduct of its business as presently conducted and as proposed to be conducted;
all such Permits are, and as of the Closing will be, in full force and effect;
no violations or notices of failure to comply have been issued or recorded in
respect of any such Permits; and the Company has no knowledge of any reason why
such Permits may be revoked or suspended. All applications, reports, notices and
other documents required to be filed by the Company with all Governmental
Authorities have been timely filed and are complete and correct in all material
respects as filed or as amended prior to the date hereof. With respect to any
required Permits, applications for which are either pending or contemplated to
be made pursuant to the business strategy of the Company, the Company knows of
no reason why such Permits should not be approved and granted by the appropriate
Governmental Authority. Neither the Company nor, to the Company's best
knowledge, any of its officers, employees or agents has made any illegal or
improper payments to, or provided any illegal or improper inducement for, any
governmental official or other Person in an attempt to influence any such Person
to take or to refrain from taking any action relating to the Company.

          2.7  Absence of Certain Changes or Events. Since December 31, 1999,
there has been no change in the Condition of the Company, except for changes in
the ordinary course of business consistent with past practice which have not
been, in the aggregate, materially adverse to the Company.

          2.8  Title to Assets. The Company has good and marketable title to all
of its assets and properties, free and clear of any liens, pledges, security
interests, claims, encumbrances or other restrictions of any kind (collectively,
"LIENS"). With respect to any assets or properties it leases, the Company holds
a valid and subsisting leasehold interest therein, free and clear of any Liens,
is in compliance, in all material respects, with the terms of the applicable
lease, and enjoys peaceful and undisturbed possession under such lease. All of
the assets and properties of the Company that are material to the conduct of
business as presently conducted or as proposed to be conducted by it are in good
operating condition and repair, subject to ordinary wear and tear. The inventory
of the Company is in good and marketable condition, does not and will not
include any material quantity of items which are obsolete, damaged or slow
moving, and is salable (or may be leased) in the normal course of business as
currently conducted by it, at current applicable prices and within normal
inventory "turn" experience.

          2.9  Contracts. True and correct copies of all contracts, agreements,
notes, instruments, franchises, leases, licenses, commitments, arrangements or
understanding, written or oral (collectively, "CONTRACTS") which are material to
the Condition of the Company have been

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made available to the Investor. All of the Contracts are in full force and
effect and constitute legal, valid and binding obligations of the Company and,
to the best knowledge of the Company, the other parties thereto; the Company
and, to the best knowledge of the Company, each other party thereto, has
performed in all material respects all obligations required to be performed by
it under the Contracts, and no material violation or default exists in respect
thereof, nor any event that with notice or lapse of time, or both, would
constitute a default thereof, on the part of the Company or, to the best
knowledge of the Company, any other party thereto; none of the Contracts is
currently being renegotiated; and the validity, effectiveness and continuation
of all Contracts will not be materially adversely affected by the transactions
contemplated by this Agreement.

          2.10 Intellectual Property. (a) (i) The Company owns, or has the right
to use, all United States and foreign patents, trademarks, service marks, trade
names, brand names, computer software and programs, franchises, technology,
know-how and processes, and registered copyrights, and any applications for any
of the foregoing (collectively, the "INTELLECTUAL PROPERTY") of any kind in
which the Company has an interest or which is otherwise used in, or relates to
its business. SCHEDULE 4 hereto contains a true, correct and complete list of
all registered trademarks and service marks, all reserved trade names, all
registered copyrights and all filed patent applications and issued patents that
are used in the Company's business or are otherwise necessary for the conduct of
its business as heretofore conducted and all licenses or agreements that in any
way affect the rights of the Company to any of its Intellectual Property or any
trade secret material (the "INTELLECTUAL PROPERTY LICENSES").

                    (ii)  Subject to the limitations set forth in the
Intellectual Property Licenses, the Company has all right, title and interest in
all of the Intellectual Property, free and clear of all Liens. The Company owns
or has the exclusive or non-exclusive right to use all Intellectual Property or
trade secrets necessary to conduct its business as now being conducted or as
proposed to be conducted. The Company owns or possesses sufficient licenses or
other rights to use all Intellectual Property covered by its patents or patent
applications necessary to conduct its business as now being conducted and as
proposed to be conducted by the Company.

                    (iii) The Company has not disclosed, other than in the
ordinary course of business and consistent with past practice and pursuant to
the Intellectual Property Licenses, any proprietary information relating to the
Intellectual Property or the Intellectual Property Licenses to any person other
than the Investor and the previous investors in the Company. The Company has at
all times maintained reasonable procedures to protect and has enforced all of
its trade secrets. The Company has disclosed trade secrets to other Persons
solely as required for the conduct of its business and solely under
nondisclosure agreements that are enforceable by the Company. Other than
pursuant to the Intellectual Property Licenses, the Company is not under any
contractual or other obligation to disclose any proprietary information relating
to the Intellectual Property, any trade secret material to the Company or the
Intellectual Property Licenses, nor, to the best knowledge of the Company, is
any other party to the Intellectual Property Licenses under any such obligation
to disclose proprietary information included in or relating to the Intellectual
Property, any trade secret material to the Company or the Intellectual Property
Licenses to any Person, and no event has taken place, including the execution
and delivery of this Agreement and the transactions contemplated hereby or any
related change in the business activities of the Company, that would give rise
to such obligation.

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                    (iv)  The consummation of the transactions contemplated
hereby will not alter, adversely affect or impair the rights of the Company to
any of the Intellectual Property, any trade secret material to it, or under any
of the Intellectual Property Licenses.

               (b)  (i)   No claim with respect to the Intellectual Property,
any trade secret material to the Company, or any Intellectual Property License
which would adversely affect the ability of the Company to conduct its business
as presently conducted and as proposed to be conducted is currently pending or,
to the best knowledge of the Company, has been asserted, or overtly threatened
by any Person, nor does the Company know of any grounds for any claim against
the Company: (A) to the effect that any operation or activity of the Company
presently occurring or contemplated, including, among other things, the
manufacture, use or sale of any product, device, instrument, or other material
made or used according to the patents or patent applications included in the
Intellectual Property or Intellectual Property Licenses, infringes or
misappropriates any United States or foreign copyright, patent, trademark,
service mark or trade secret; (B) to the effect that any other Person infringes
on the Intellectual Property or misappropriates any trade secret or know-how or
other proprietary rights material to the Company; (C) challenging the ownership,
validity or effectiveness of any of the Intellectual Property or trade secret
material of the Company; or (D) challenging the license of the Company or other
legally enforceable right under, any Intellectual Property or the Intellectual
Property Licenses.

                    (ii)  The Company is not aware of any presently existing
United States or foreign patents or any patent applications which if issued as
patents would be infringed by any activity contemplated by the Company.

               (c)  (i)   The United States and foreign patents and patent
applications owned by the Company listed in SCHEDULE 5 hereto (the "PATENTS AND
APPLICATIONS") as part of the Intellectual Property have been properly prepared
and filed on behalf of the Company as named therein and are being diligently
pursued by the Company. The inventions described in the Patents and Applications
are assigned or licensed to the Company and no other entity or individual has
any right or claim in any of the inventions, Patents and Applications or any
patents to be issued therefrom, except as set forth in the Intellectual Property
Licenses. To the Company's best knowledge, there are no defects in any of the
Patents and Applications that would cause any of them to be held invalid or
unenforceable. All relevant prior art of which the Company is aware has been
filed in the Patents and Applications.

                    (ii)  The Company has delivered to the Investor all
information in its possession or of which it has knowledge concerning the
Patents and Applications and has no knowledge of any objection or proceeding,
pending or threatened, that would affect the validity of any patent issued
pursuant thereto. The Company has furnished to the Investor all prior art, of
which it presently has knowledge, that may be material to the validity or
enforceability of the patent claims being prosecuted in the Patents and
Applications.

                    (iii) Except in connection with the prosecution of the
patent applications listed in SCHEDULE 5 hereto, there are no pending judicial
or governmental proceedings, including but not limited to interferences and
oppositions, relating to any of the Patents and Applications or any other
proprietary information to which the Company is a party or

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by which any property (including rights pursuant to licenses or options or other
rights to acquire licenses) of the Company is subject, and no such proceedings
are threatened or contemplated by Governmental Authorities or other Persons.

               (d)  Nothing has come to the attention of the Company that has
caused it to believe that this SECTION 2.10, as of the date hereof and as of the
Closing, contains any untrue statement of a material fact or omits to state a
material fact required to be stated herein or necessary to make the statements
herein not misleading.

          2.11 Insurance. The Company has in full force and effect all insurance
policies as are sufficient for compliance with all requirements of Law and
applicable agreements.

          2.12 Labor Union Activities; Employee Relations. No employee of the
Company is represented by any labor union or covered by any collective
bargaining agreement; nor, to the best knowledge of the Company, has any labor
union sought to represent any of its employees of the Company. There is no
strike or other labor dispute involving the Company pending, or to the best
knowledge of the Company, threatened. To the best knowledge of the Company, no
officer or key employee intends to terminate his employment with it. To the best
knowledge of the Company, no officer or key employee of it is a party to or
bound by any Contract, or subject to any restrictions (including, without
limitation, any non-competition restriction), which would restrict the right of
such person to participate in the affairs of the Company.

          2.13 ERISA. The Company does not maintain (nor has it ever maintained)
nor does it have (nor has it ever had) any obligation under (including, without
limitation, any obligation to contribute to) an employee benefit plan as
described in Section 3(3) of the Employee Retirement Income Security Act of
1974, as amended ("ERISA").

          2.14 Taxes. All federal, state, city, county, local and foreign
income, franchise, sales, use and value added tax returns and reports, and all
other material tax returns and reports required to be filed by the Company in
those or in any other jurisdiction (collectively, "RETURNS") have been timely
filed. All such Returns are true, correct and complete in all material respects.
All taxes, assessments, fees, interest, penalties and other charges with respect
thereto (collectively, "TAXES") due or claimed to be due from the Company have
been paid except to the extent reserved against on the Company's financial
statements. No income tax return of the Company has been audited by the
applicable Governmental Authority, and there are in effect no waivers of the
applicable statute of limitations for Taxes in any jurisdiction for the Company
for any period.

          2.15 Environmental Matters. The business, assets and properties of the
Company are and have been operated and maintained in compliance with all
applicable federal, state, city, county and local environmental protection laws
and regulations (collectively, the "ENVIRONMENTAL LAWS"). No event has occurred
which, with or without the giving of notice or the passage of time or both,
would constitute non-compliance by the Company with, or a violation by the
Company of, the Environmental Laws. The Company has not caused or permitted to
exist, as a result of an intentional or unintentional act or omission, a
disposal, discharge or release of solid wastes, pollutants or hazardous
substances, on or from any site

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which currently is or formerly was owned, leased, occupied or used by it, except
where such disposal, discharge or release was in compliance with the
Environmental Laws.

          2.16 Books and Records. The books of account, ledgers and records of
the Company accurately and completely reflect in all material respects all
information relating to its business, the nature, acquisition, maintenance,
location and collection of its assets, and the nature of all transactions giving
rise to its obligations or accounts receivable. The minute books of the Company
fully set forth all action taken by its Board of Directors, stockholders and, if
any, executive committee (or other committee thereof).

          2.17 Transactions with Affiliates. Except for the loan from the
Company to Stan Cipkowski reflected as "Due from Officers" on the Company's most
recent balance sheet filed with the Securities and Exchange Commission (the
"SEC"), the Company has not had any direct or indirect dealings with any
Principal Owner or with any of such Principal Owner's Affiliates, associates or
relatives and the Company has no obligation to or claim against any Principal
Owner, or any of such Principal Owner's Affiliates, associates or relatives, and
no such Person has any obligation to or claim against the Company. All products,
services or benefits provided to the Company by any such Person, or provided by
the Company to any such Person are provided at a charge equal to the fair market
value of such products, services or benefits. No Principal Owner, nor to the
Company's best knowledge any of such Principal Owner's Affiliates, associates or
relatives, has any direct or indirect interest of any kind in any business or
entity which is competitive with the Company. An "AFFILIATE" of a specified
Person shall mean a person that directly, or indirectly through one or more
intermediaries, controls or is controlled by, or is under common control with,
the Person specified.

          2.18 Registration Rights. Except for the registration rights granted
to the Investor by this Agreement and the registration rights granted to the
holders of outstanding Warrants, no Person has, and as of the Closing no Person
shall have, demand, "piggy-back" or other rights to cause the Company to file
any registration statement under the Securities Act of 1933, as amended (the
"SECURITIES ACT"), relating to any of its securities or to participate in any
such registration statement.

          2.19 No Brokers or Finders. Neither the Company nor any of its
respective Affiliates has entered or will enter into any agreement pursuant to
which the Company or the Investor will be liable, as a result of the
transactions contemplated by this Agreement or any of the Purchase Documents,
for any claim of any person for any commission, fee or other compensation as
finder or broker and the Company agrees to indemnify the Investor for any
liability resulting from any such agreement.

          2.20 Investment Company Act. The Company is not an "Investment
Company" nor is the Company directly or indirectly controlled by or acting on
behalf of any Person which is an "Investment Company" within the meaning of the
Investment Company Act of 1940, as amended.

          2.21 Business Plan. Any business information of the Company previously
submitted to the Investor in any form, including the projections contained
therein, was prepared by the senior management of the Company, is based on
assumptions which are reasonable, and

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reflects management's best judgment based on present circumstances of the most
likely set of conditions and courses of action and most likely financial
condition and results of operations, for the period(s) reflected therein. The
Company is not aware of any fact or condition which could reasonably be expected
to result in the Company not achieving the results described in such business
plan.

          2.22 Disclosure. In connection with the purchase of the Securities by
the Investor as contemplated hereby, the Company has, to its knowledge,
disclosed to the Investor all material facts and information concerning the
Company, its Condition and the Securities, and has not, to its knowledge, made
any untrue statement of a material fact or omitted to state any material fact
necessary in order to make the statements contained herein or in any of the
other Purchase Documents not misleading.

          2.23 SEC Documents. The Company has filed, pursuant to the Securities
Act and the Securities Exchange Act of 1934, as amended (the "EXCHANGE ACT"),
all SEC Documents (as defined below) required to be filed with respect to the
business and operations of the Company under each of the Securities Act and
Exchange Act, and the business and operations of the Company under each of the
Securities Act and the Exchange Act, and the respective rules and regulations
thereunder, and all of the SEC Documents complied in all material respects with
all applicable requirements of the Securities Act or the Exchange Act, as the
case may be, and the appropriate act and the rules and regulations thereunder in
effect on the date each such report was filed. At the respective dates they were
filed, none of the SEC Documents contained any untrue statement of a material
fact or omitted to state any material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading. The consolidated financial statements of
the Company included in the SEC Documents complied in all material respects with
the applicable accounting requirements and the published rules and regulations
of the Securities and Exchange Commission with respect thereto, have been
prepared in accordance with GAAP consistently applied throughout the periods
involved (except as may be indicated therein or in the notes thereto) and fairly
present the consolidated financial position, results of operations and cash
flows of the Company as of the dates and for the periods indicated therein,
subject, in the case of the unaudited statements, to normal year-end adjustments
and the absence of certain footnote disclosures. "SEC DOCUMENTS" means all
material, forms, statements, reports and documents (including all exhibits,
amendments and supplements thereto) required to be filed with respect to the
business and operations of the Company under each of the Securities Act and the
Exchange Act, and the respective rules and regulations thereunder.

     3.   REPRESENTATIONS AND WARRANTIES OF THE INVESTOR. The Investor hereby
represents and warrants to, and agrees with, the Company as follows:

          3.1  Organization. The Investor is, and as of the Closing will be,
duly organized, validly existing and in good standing under the laws of its
jurisdiction of organization.

          3.2  Authorization. The Investor has, and as of the Closing will have,
all requisite power and authority to execute, deliver and perform this Agreement
and to consummate the transactions contemplated hereby. The execution, delivery
and performance of this Agreement, and the consummation of the transactions
contemplated hereby, have been duly and

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validly authorized by all necessary action on the part of the Investor. This
Agreement has been duly executed and delivered by the Investor and constitutes
its legal, valid and binding obligation, enforceable against the Investor in
accordance with its terms, except as its enforceability may be limited by
bankruptcy, insolvency or other similar laws affecting the enforceability of
creditors' rights in general or by general principles of equity.

          3.3  No Legal Bar; Conflicts. Neither the execution and delivery of
this Agreement, nor the consummation by the Investor of the transactions
contemplated hereby, violates any law, statute, ordinance, regulation, order,
judgment or decree of any court or governmental agency applicable to the
Investor, or violates, or conflicts with, any contract, commitment, agreement,
understanding or arrangement of any kind to which the Investor is a party or by
which the Investor is bound.

          3.4  No Litigation. No action, suit or proceeding against the Investor
relating to the consummation of any of the transactions contemplated by this
Agreement nor any governmental action against the Investor seeking to delay or
enjoin any such transactions is pending or, to the Investor's knowledge,
threatened.

          3.5  Investment Intent. The Investor (i) is an accredited investor
within the meaning of Rule 501(a) under the Securities Act, (ii) is aware of the
limits on resale imposed by virtue of the nature of the transactions
contemplated by this Agreement and is aware that the certificates representing
the Investor's respective ownership of Common Stock will bear related
restrictive legends and (iii) except as otherwise set forth herein, is acquiring
the shares of the Company hereunder without registration under the Securities
Act in reliance on the exemption from registration contained in Section 4(2) of
the Securities Act, for investment for its own account, and not with a view
toward, or for sale in connection with, any distribution thereof, nor with any
present intention of distributing or selling such shares. The Investor has been
given the opportunity to ask questions of, and receive answers from, the
officers of the Company regarding the Company, its current and proposed business
operations and the Common Stock, and the officers of the Company have made
available to the Investor all documents and information that the Investor has
requested relating to an investment in the Company. The Investor has been
represented by competent legal counsel in connection with its purchase of the
Common Stock and acknowledges that the Company has relied upon the Investor's
representations in this SECTION 3 in offering and selling Common Stock to the
Investor.

          3.6  No Brokers or Finders. Neither the Investor nor any of its
respective Affiliates has entered or will enter into any agreement pursuant to
which the Investor or the Company will be liable, as a result of the
transactions contemplated by this Agreement or any of the Purchase Documents,
for any claim of any person for any commission, fee or other compensation as
finder or broker and the Investor agrees to indemnify the Company for any
liability resulting from any such agreement.

          3.7  Economic Risk; Restricted Securities. The Investor recognizes
that the investment in the Securities involves a number of significant risks.
The foregoing, however, does not limit or modify the representations, warranties
and agreements of the Company in SECTION 2 or the right of the Investor to rely
thereon. The Investor is able to bear the economic

                                      -10-
<PAGE>   11

risks of an investment in the Securities for an indefinite period of time, has
no need for liquidity in such investment and, at the present time, can afford a
complete loss of such investment.

     4.   CONDITIONS TO THE INVESTOR'S OBLIGATION TO CLOSE. The obligation of
the Investor to purchase the Securities to be purchased by it at the Closing is
subject to the fulfillment, to the Investor's satisfaction, prior to or at the
Closing, of each of the following conditions:

          4.1  Representations and Warranties. The representations and
warranties of the Company contained in this Agreement and the other Purchase
Documents shall be true and correct in all material respects on and as of the
Closing Date as if made on and as of such date.

          4.2  Performance. The Company shall have performed and complied with
all agreements and conditions required by this Agreement and the other Purchase
Documents to be performed or complied with by it prior to or at the Closing.

          4.3  Stock Certificates. Etc. At the Closing, the Company shall have
tendered to the Investor a certificate representing the Investor's shares of
Common Stock, all in form and substance satisfactory to the Investor and
sufficient to transfer to, and vest in, the Investor good and valid title to the
Common Stock, free and clear of any Lien.

          4.4  Conduct of Business. The Company shall carry on its business
diligently and shall not make or institute any unusual methods of management,
accounting or operation, except as agreed to in writing by the Investor. All of
the property of the Company shall be used, operated, repaired and maintained in
a normal business manner consistent with past practice.

          4.5  Compliance With Laws. The Company will comply in all material
respects with all laws and regulations which are applicable to it, its ownership
of its assets or to the conduct of its business and will perform and comply in
all material respects with all contracts, commitments and obligations by which
it is bound.

          4.6  No Material Adverse Change. There shall not have occurred any
material adverse change in the Condition of the Company.

          4.7  Consents. The Company shall have obtained all consents, approvals
or waivers from Governmental Authorities and third Persons necessary for the
execution, delivery and performance of this Agreement, the other Purchase
Documents and the transactions contemplated hereby and thereby, all without
material cost or other adverse consequences to the Company. Without limiting the
generality of the foregoing, if applicable, each of the Company's existing
stockholders shall have waived any preemptive right or right of first offer any
such stockholder may have to purchase any of the Securities.

          4.8  No Litigation. There shall not be any Action of or before any
Governmental Authority or other Person pending or threatened with respect to
this Agreement, the other Purchase Documents or the transactions contemplated
hereby or thereby or which might materially adversely affect the Condition of
the Company.

          4.9  Opinion of Counsel. The Investor shall have received from Hopkins
& Sutter an opinion dated as of the Closing, in the form attached hereto as
EXHIBIT A.

                                      -11-
<PAGE>   12

          4.10 Compliance Certificate. The Investor shall have received a
certificate dated as of the day of the Closing executed by the President of the
Company certifying that the conditions specified in this SECTION 4 have been
fulfilled.

          4.11 Related Documents. The Purchase Documents shall have been
executed and delivered by each of the parties thereto and be in full force and
effect.

          4.12 Due Diligence. The Investor shall have completed its business,
financial and legal due diligence to its satisfaction, in its sole and
unreviewable judgment.

          4.13 Financing. The Investor shall have consummated on or before the
Closing Date a financing on such terms, subject to such conditions and in such
amount as are acceptable to the Investor, in its sole discretion.

          4.14 Voting Agreement. The Investor, the Company and the holders of at
least 5,000,000 of the outstanding common shares of the Company have entered
into a voting agreement (the "VOTING AGREEMENT"), substantially in the form
attached as EXHIBIT B.

          4.15 Proceedings and Documents. All proceedings in connection with the
transactions contemplated hereby and all documents and instruments incident to
such transactions shall be satisfactory in substance and form to the Investor
and its counsel, in all material respects, and the Investor shall have received
all such counterpart originals or certified or other copies of such documents as
the Investor may reasonably request.

          If at the Closing the Company fails to tender to the Investor the
documents specified herein which are required to be delivered to the Investor at
the Closing or if at the Closing any of the conditions specified in this SECTION
4 shall not have been fulfilled to the Investor's reasonable satisfaction, the
Investor shall, at its election, be relieved of all further obligations under
this Agreement.

     5.   CONDITIONS OF THE COMPANY'S OBLIGATIONS AT CLOSING. The obligations of
the Company to the Investor under this Agreement are subject to the fulfillment,
prior to or at the Closing, of each of the following conditions:

          5.1  Representations and Warranties. The representations and
warranties of the Investor contained in this Agreement shall be true and correct
in all material respects on and as of the Closing Date as if made on and as of
such date.

          5.2  Payment of Purchase Price. The Investor shall have delivered to
the Company the Investment Amount.

          5.3  No Litigation. There shall not be any Action of or before any
Governmental Authority or other Person pending or threatened with respect to
this Agreement or the transactions contemplated hereby.

          5.4  Proceedings and Documents. All proceedings in connection with the
transactions contemplated hereby and all documents and instruments incident to
such transactions shall be satisfactory in substance and form to the Company and
its counsel, and the

                                      -12-
<PAGE>   13

Company shall have received all such counterpart originals or certified or other
copies of such documents as it may reasonably request.

          If at the Closing the Investor fails to tender to the Company the
payment or documents specified herein which are required to be delivered to the
Company at the Closing or if at the Closing any of the conditions specified in
this SECTION 5 shall not have been fulfilled to the Company's reasonable
satisfaction, the Company shall, at its election, be relieved of all further
obligations to the Investor under this Agreement.

     6.   CERTAIN POST-CLOSING COVENANTS OF THE COMPANY. The Company covenants
and agrees with the Investor as follows:

          6.1   Voting Agreement. If not delivered at the Closing, the Company
shall enter into and deliver the Voting Agreement to the Investor within thirty
(30) days after the Closing.

          6.2   Annual Meetings. The Company will hold an annual meeting of all
shareholders at which information with respect to its business will be furnished
and discussed.

          6.3   Information. The Investor and its assignees shall be entitled to
receive, and the Company agrees to provide to the Investor and its assignees,
the following:

          (a)   Financial and Related Data.

          (i)   If not timely filed with the SEC, as soon as available, but in
any event not later than forty-five (45) days after the end of each fiscal
quarter, the unaudited balance sheet as at the end of such quarter of the
Company and the related unaudited statements of operations, stockholders' equity
and cash flows of such quarter and for the elapsed period of such fiscal year,
all in reasonable detail and stating in comparative form the figures as of the
end of and for the comparable period of the preceding fiscal year and budgeted
figures for the period. All such financial statements shall be complete and
correct in all material respects subject to year-end adjustments, and shall be
accompanied by a certificate of the President or chief financial officer of the
Company to such effect.

          (ii)  If not timely filed with the SEC, as soon as available, but in
any event within 90 days after the end of each fiscal year of the Company, the
audited balance sheet of the Company as at the end of such fiscal year and the
related audited statements of operations, stockholders' equity and cash flows of
the Company for such fiscal year, all in reasonable detail and stating in
comparative form the figures as at the end of and for the previous fiscal year
and budgeted figures for the fiscal year, accompanied by an opinion of an
accounting firm of nationally recognized standing selected by the Company with
respect to such financial statements, which opinion shall state that such
accounting firm's audit was conducted in accordance with generally accepted
auditing standards and, accordingly, included such tests of accounting records
and such other auditing procedures as were considered necessary under the
circumstances and which opinion shall not be subject to any qualification
resulting from a limit on the scope of the examination of the financial
statements or the underlying data or which could be eliminated by changes in the
financial statements or the notes thereto or by the creation of or

                                      -13-
<PAGE>   14

increase in a reserve or a decreased carrying value of assets. All such
financial statements shall be complete and correct in all material respects and
prepared in reasonable detail and in accordance with GAAP applied, except as
stated therein, on a consistent basis throughout the periods reflected therein.

          (iii) As soon as available, but in any event not later than 30 days
following the end of each fiscal year of the Company, the financial plan and
business plan of the Company for the next succeeding fiscal year, including but
not limited to cash flow and balance sheet projections and operating budget,
calculated monthly, and any updates or revisions as soon as available.

          (iv)  If not timely filed with the SEC, promptly, but in any event
within ten (10) days, after any distribution to its stockholders generally or to
specific stockholders by agreement, to its directors, to prospective investors
or to the financial community of an annual report, proxy statement, registration
statement or other similar report or communication, a copy of each such report,
proxy statement, registration statement or other similar report or
communication; and promptly, but in any event within ten (10) days after any
filing with the Securities and Exchange Commission or with any national
securities exchange or with the National Association of Securities Dealers,
Inc., of any publicly available annual or periodic or special report or proxy
statement or registration statement, a copy of such report or statement; and
promptly, but in any event within two (2) business days, after released, copies
of all press releases and other statements made available generally by the
Company to the public concerning material developments.

          (v)   From time to time, and promptly, such additional information and
financial data regarding results of operations, financial condition, business,
affairs or prospects of the Company, which the Investor may reasonably request.

                (b)  Access to Properties. The Company shall permit
representatives designated by the Investor, upon reasonable prior notice to the
Company, to visit and inspect each of the Company's properties, to examine its
respective corporate and financial records (and make copies thereof or extracts
therefrom), to discuss its respective affairs, finances and accounts with the
Company's directors and officers, and, through the President or chief financial
officer of the Company's, as the case may be, its key employees and accountants,
all at such reasonable times as may be requested by the Investor.

          6.4   Exemption from Investment Company Act. The Company shall conduct
its business so that it shall not become an "investment company" within the
meaning of the Investment Company Act of 1940, as amended.

          6.5   Accounting and Reserves. The Company shall maintain a standard
and uniform system of accounting and shall keep proper books and records and
accounts in which full, true and correct entries shall be made of its
transactions, all in accordance with GAAP applied on a consistent basis through
all periods, and shall set aside on such books for each fiscal year all such
proper reserves for depreciation, obsolescence, amortization, bad debts and
other purposes in connection with its operations as are required by such
principles so applied.

                                      -14-
<PAGE>   15

          6.6   Transactions with Affiliates. Except for arrangements for
development research involving aggregate amounts less than $50,000, the Company
shall not, directly or indirectly, enter into any transaction or agreement with
any stockholder of the Company or any Affiliate of the Company, unless the
transaction or agreement is (i) reviewed and approved by a majority of
Disinterested Directors (as defined below) and (ii) on terms no less favorable
to the Company than those obtainable from a non-Affiliated Person. A
"DISINTERESTED DIRECTOR" shall mean an individual who is not and who has not
been an officer or employee of the Company and who is not a member of the family
of, controlled by or under common control with, any such officer or employee.

          6.7   Additional Covenants.

                (a)  The Company shall timely file all such SEC Documents
required to be filed by it pursuant to the Exchange Act in order to permit sales
under Rule 144 of the Securities Act.

                (b)  During any period in which the Company is not subject to
Section 13 or 15(d) of the Exchange Act, the Company shall make available
information required to be provided by Rule 144A(d)(4), upon request.

                (c)  Upon the request of the Investor and the certification of
the Investor that it qualifies under Rule 144(k) of the Securities Act, the
Company shall, without further requirement, remove all restrictive legends from
the Investor's Securities, insofar as such restrictions relate to the transfer
of such securities under the Securities Act.

          6.8   Issuance of Warrants. In the event that upon the six-month
anniversary of the Closing Date (the "ANNIVERSARY DATE") the average of the
closing prices of the Common Stock on the Nasdaq SmallCap Market (or such other
quotation system or securities exchange upon which the Company's Common Stock is
then traded) as reported by the Nasdaq Stock Market on the 10 consecutive
trading days immediately preceding the Anniversary Date (the "ANNIVERSARY
PRICE") is less than 1.5 times the Closing Price, the Company shall grant to the
Investor five-year warrant (the "WARRANTS"), to purchase, at an exercise price
equal to the Anniversary Price, such number of shares of the Common Stock as
determined in accordance with the following formula:

W=(I/CP)x50%x((1.5 x CP)-AP)
             ---------------
               0.50 x CP

where:

W = the number of Warrants issuable pursuant to this SECTION 6.8.

I = the Investment Amount.

CP = the Closing Price.

AP = the Anniversary Price.

                                      -15-
<PAGE>   16

Notwithstanding the foregoing, the number of Warrants issuable pursuant to this
SECTION 6.8 shall not exceed 2,134,016. The Warrants shall be substantially in
the form attached hereto as EXHIBIT C.

          6.9   Registration of Shares of Common Stock and the Warrant Shares.

                (a)  The Company agrees to register the shares of Common Stock
by filing a registration Statement on Form S-3 (or any successor form thereto)
with respect to the Common Stock and to have such registration statement
declared effective on or prior to the Anniversary Date. The Company shall cause
such registration statement to remain effective for (5) years following the
Anniversary Date unless the Investor informs the Company that it has liquidated
its position.

                (b)  The Company agrees to register the Warrant Shares by filing
a registration statement on Form S-3 (or any successor form thereto) or, if
permissible, by filing a post-effective amendment to the Form S-3 filed to
register the shares of Conversion Stock, as soon as practicable after the
Anniversary Date, but in no event later than sixty (60) days after the
Anniversary Date, and using its best efforts to have such registration statement
or post-effective amendment, as the case may be, become effective as soon as
practicable, but in no event later than ninety (90) days after the Anniversary
Date. The Company shall cause such registration statement to remain effective
for five (5) years following the Anniversary Date unless the Investor informs
the Company that it has liquidated its position.

                (c)  In the event the Company fails to satisfy its obligations
to the Investor under this SECTION 6.9, the Company shall be obligated to pay to
the Investor liquidated damages in an amount equal to five percent (5%) per
month (or any part thereof), compounded monthly, on the Investment Amount
pursuant to Section 6.9(a) or on the amount determined by multiplying the number
of Warrants issuable pursuant to Section 6.8 by the Anniversary Date pursuant to
Section 6.9(b), until such time the Company is no longer in breach of this
SECTION 6.9. Any payments due to the Investor pursuant to this SECTION 6.9(C)
shall be made no later than the fifteenth (15th) day of the month following the
month in which such liquidated damages were incurred.

     7.   MISCELLANEOUS.

          7.1  Hedging Activities. The Investor shall not engage in any hedging
transactions (including short sales, put and call options, cashless collar
transactions or other forms of derivative security transactions) with respect to
the Common Stock that may have an impact on the market price of the Common
Stock.

          7.2  Expenses. The Company shall pay all of the Investor's legal fees
relating to the preparation of this Agreement and all documents related hereto.

          7.3  Publicity. Except as may be required by Law, or in connection
with a public offering, the Company shall neither use the name of, nor make
reference to, the Investor or

                                      -16-
<PAGE>   17

any of its Affiliates in any press release or in any public manner without the
Investor's prior written consent.

          7.4  Indemnification. The Company agrees to indemnify the Investor and
each officer, director, employee, agent, partner, stockholder and Affiliate of
the Investor (collectively, the "INDEMNIFIED PARTIES") for, and hold each
Indemnified Party harmless from and against: (i) any and all damages, losses,
claims and other liabilities of any and every kind, including, without
limitation, judgments and costs of settlement, and (ii) any and all
out-of-pocket costs and expenses of any and every kind, including, without
limitation, reasonable fees and disbursements of counsel for such Indemnified
Parties (all of which expenses periodically shall be reimbursed as incurred), in
each case, arising out of or suffered or incurred in connection with any of the
following: (a) any misrepresentation or any breach of any warranty made by the
Company herein or in any of the other Purchase Documents, (b) any breach or
non-fulfillment of any covenant or agreement made by the Company herein or in
any of the other Purchase Documents, and (c) any claim relating to or arising
out of a violation of applicable federal or state securities laws by the Company
in connection with the sale of the Securities by the Company to the Investor.

          7.5  Survival. All representations, warranties, covenants and
agreements contained in or made pursuant to this Agreement or contained in any
certificate delivered pursuant to this Agreement, shall remain operative and in
full force and effect, regardless of any investigation made by or on behalf of
any party hereto, and shall survive the transfer and payment for the Securities
and the consummation of the transactions contemplated hereby.

          7.6  Assignment. This Agreement and all the provisions hereof shall be
binding upon and shall inure to the benefit of the parties hereto and their
respective successors and assigns, if any, except that neither this Agreement
nor any rights or obligations hereunder shall be assigned or delegated by the
Company without the prior written consent of the Investor. After the Closing,
the Investor and its successors and assigns may, without the consent of the
Company, assign this Agreement and/or any of the Investor's rights hereunder and
under the other Purchase Documents (including, without limitation, any or all of
the Securities), in whole or in part, to (i) any Affiliate of the Investor; (ii)
any other transferee of at least 20% of the Securities acquired by the Investor;
or (iii) in connection with an estate transfer, provided, however, that the
Company shall not be required to permit such Assignment if such Assignment is in
violation of federal securities regulations or relevant state "blue sky" laws.

          7.7  Amendment; Waiver. Any term, covenant, agreement or condition of
this Agreement may be amended, and compliance therewith may be waived (either
generally or in a particular circumstance and either retroactively or
prospectively), by one or more substantially concurrent written instruments
signed by the Company and by the Investor. Any amendment or waiver effected in
accordance with this paragraph shall be binding upon the Investor and the
Company.

          7.8  Applicable Law. The laws of the State of New Jersey shall govern
the interpretation, validity and performance of the terms of this Agreement,
regardless of the law that might be applied under principles of conflicts of
law.

                                      -17-
<PAGE>   18

          7.9  Judicial Proceedings. Any judicial proceeding involving any
dispute, controversy or claim arising out of or relating to this Agreement or
the rights or interests of the Investor or the Company or the breach or alleged
breach of this Agreement, whether arising during or at or after the termination
of this Agreement (each of the foregoing disputes, controversies and claims
hereinafter referred to as an "AGREEMENT DISPUTE"), shall be brought only in a
federal or state court located in the county, city and state of New Jersey, and
each of the parties hereto (i) unconditionally accepts the exclusive
jurisdiction of such courts and any related appellate court and irrevocably
agrees to be bound by any judgment rendered thereby and (ii) irrevocably waives
any objection such party may now have or hereafter has as to the venue of any
such proceeding brought in such a court or that such court is an inconvenient
forum. Each of the parties hereto hereby waives trial by jury in any judicial
proceeding to which they are parties involving an agreement dispute.

          7.10 Notices. All notices and other communications provided for herein
shall be dated and in writing and shall be deemed to have been duly given (x) on
the date of delivery, if delivered personally or by telecopier, receipt
confirmed, (y) on the second following business day, if delivered by a
recognized overnight courier service, or (z) seven days after mailing, if sent
by registered or certified, return receipt requested, postage prepaid, in each
case, to the party to whom it is directed at the following address (or at such
other address as any party hereto shall hereafter specify by notice in writing
to the other parties hereto):

          (i)  If to the Company, to it at the following address:

               American Bio Medica Corporation
               122 Smith Road
               Kinderhook, New York 12106
               Attention:  President

          (ii) If to the Investor, to it at the following address:

               Seaside Partners, L.P.
               623 Ocean Avenue
               Sea Girt, New Jersey 08750
               Attention: Managing Director

               with a copy to:

               Buchanan Ingersoll Professional Corporation
               650 College Road East
               Princeton, New Jersey 08540
               Attention: David J. Sorin, Esq.
               Telephone:  (609) 987-6800
               Telecopier:  (609) 520-0360

          7.11 Integration. This Agreement and the documents referred to herein
or delivered pursuant hereto or pursuant to such documents, including all
exhibits and schedules,

                                      -18-
<PAGE>   19

contain the entire understanding of the parties with respect to their subject
matter and supersede all prior agreements and understandings between the parties
with respect to their subject matter.

          7.12 Severability. Each provision of this Agreement shall be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement is held to be prohibited or invalid under
applicable law, such provision will be ineffective only to the extent of such
prohibition or invalidity, without invalidating the remainder of this Agreement.

          7.13 Descriptive Headings. The section and other headings contained in
this Agreement are for convenience of reference only and shall not affect the
meaning or interpretation of this Agreement. Unless otherwise stated, all
references herein to "sections" shall be deemed to be references to sections or
subsections, as appropriate, of this Agreement.

          7.14 Counterparts. This Agreement may be executed in two or more
counterparts, each of which when so executed and delivered shall be deemed to be
an original and all of which together shall be deemed to be one and the same
agreement.

                            [SIGNATURE PAGE FOLLOWS]

                                      -19-
<PAGE>   20

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

                                 AMERICAN BIO MEDICA CORPORATION

                                 By:
                                     ----------------------------------------
                                     Name:  Stan Cipkowski
                                     Title:  President and CEO

                                 SEASIDE PARTNERS, L.P.

                                 By:
                                     ----------------------------------------
                                     Name: William J. Ritger
                                     Title:   Managing Director

                                      -20-<PAGE>   1

                                                                    Exhibit 10.6

                                CONTRACT OF SALE

               CONTRACT OF SALE made as of May 19, 1999, between

AVOBA, INC., a domestic corporation
Address:  Smith Road, Kinderhook, New York, 12106
Federal I.D. No:

                        hereinafter called "Seller", and

AMERICAN BIO MEDICA CORPORATION, a New York Corporation
Address:  300 Fairview Avenue, Hudson, New York 12534
Federal I.D. No:

                        hereinafter called "Purchaser".

THE PARTIES HEREBY AGREE AS FOLLOWS:

1.   PREMISES.  Seller shall sell and convey and Purchaser shall purchase the
     property, together with all buildings and improvements thereon
     (collectively the "Premises"), more fully described on a separate map
     marked "Schedule A", annexed hereto and made a part hereof.

     Together with Seller's ownership and rights, if any, to land lying in the
     bed of any street or highway, opened or proposed, adjoining the Premises to
     the center line thereof.

     The deed of conveyance shall be drawn as per the survey description on said
     map.

2.   PERSONAL PROPERTY.  This sale also includes all fixtures, equipment and
     articles of personal property now attached or appurtenant to the Premises.
     This sale, for the same consideration, shall include all furnishings and
     furniture currently located in the premises all as set forth and generally
     identified on Schedule "B" annexed hereto and made a part hereof. The sum
     of Twenty Thousand ($20,000) shall be allocated to the purchase of the said
     items of personal property.

3.   PURCHASE PRICE.  The purchase price is One Million Three Hundred Thousand
     Dollars ($1,300,000) payable as follows:

<PAGE>   2
      (a) Twenty Thousand Dollars ($20,000) on the signing of this contract, by
      Purchaser's check payable to the Escrowee (as hereinafter defined),
      subject to collection, the receipt of which is hereby acknowledged, to be
      held in escrow pursuant to paragraph "4" of this contract (the
      "Downpayment");
      (b) One Million Two Hundred Eighty Thousand Dollars ($1,280,000); balance
      at Closing in accordance with paragraph "5".

4.    DOWNPAYMENT IN ESCROW. (a) Seller's attorney ("Escrowee") shall hold
      the Downpayment for Seller's account in escrow in a segregated bank
      account at until Closing or sooner termination of this contract and shall
      pay over and apply the Downpayment in accordance with the terms of this
      paragraph. Escrowee shall hold the Downpayment in an interest-bearing
      account for the benefit of the parties. Interest shall be paid to the
      party entitled to the Downpayment and the party receiving the interest
      shall pay any income taxes thereof. The Federal Identification numbers of
      the parties shall be furnished to Escrowee upon request. At Closing, the
      Downpayment shall be paid by Escrowee to Seller. If for any reason Closing
      does not occur and either party gives Notice (as defined in paragraph
      "21") to Escrowee demanding payment of the Downpayment, Escrowee shall
      give prompt Notice to the other party of such demand. If Escrowee does not
      receive Notice of objection from such other party to the proposed payment
      within ten (10) business days after the giving of such Notice, Escrowee is
      hereby authorized and directed to make such payment. If Escrowee does
      receive such Notice of objection within such ten (10) day period or if for
      any other reason Escrowee in good faith shall elect not to make such
      payment, Escrowee shall continue to hold such amount until otherwise
      directed by Notice from the parties to this contract or a final,
      nonappealable judgement, order or decree of a court. However, Escrowee
      shall have the right at any time to deposit the Downpayment and the
      interest thereon with the clerk of a court in the county in which the
      Premises are located and shall give Notice of such deposit to Seller and
      Purchaser. Upon such deposit or other disbursement in accordance with the
      terms of this paragraph, Escrowee shall be relieved and discharge of all
      further obligations and responsibilities hereunder.

5.    ACCEPTABLE FUNDS. All money payable under this contract, unless otherwise
      specified, shall be paid by:
      (a) Cash, but not over $1,000.;
      (b) Good certified check of Purchaser drawn on or official check issued by
      any bank, savings bank, trust company or savings and loan association
      having a banking office in the State of New York, unendorsed and payable
      to the order of Seller, or as a Seller may otherwise direct upon not less
      than three (3) business days notice (by telephone or otherwise) to
      Purchaser;
      (c) As to money other than the purchase price payable to Seller at
      Closing, uncertified check of Purchaser up to the amount of $5,000.; and
<PAGE>   3

     (d) As otherwise agreed to in writing by Seller or Seller's attorney.

6.   MORTGAGE CONTINGENCY. This contract is contingent upon the purchaser, at
     its own cost and expense, obtaining Industrial Development Revenue Bond
     financing from the Columbia County Industrial Development Agency or some
     other appropriate agency or other lending institution at the purchaser's
     option. Such financing may include renovation and revisions to the building
     and the purchase of manufacturing equipment.

     The contingency for said financing shall expire ninety (90) days following
     the amendment of the Zoning Ordinance of the Town of Stuyvesant as set for
     hereinafter in paragraph "19(b)". If said financing is not obtained, either
     party upon ten (10) days written notice to the other may rescind this
     agreement and upon the return of the deposit by the seller to the
     purchaser, all rights of the parties hereunder shall terminate.

7.   PERMITTED EXCEPTIONS.  The Premises are sold and shall be conveyed subject
     to:
     (a)  Subdivision laws and regulations, and landmark, historic or wetlands
     designation, provided that they are not violated by the existing buildings
     and improvements erected on the property or their use;
     (b) Real estate taxes that are a lien, but are not yet due and payable; and
     (c) The other matters, if any, including a survey exception, as set forth
     on Schedule "B" of the Certificate and Report of Title, Title No. P-14865,
     Items 5(a), (b), (c), (d) and (e) and Item 8; a copy of which is annexed
     hereto and made a part of this agreement, Exhibit "C".

8.   GOVERNMENTAL VIOLATIONS AND ORDERS. (a) Seller shall comply with all notes
     or notices of violations of law or municipal ordinances, orders or
     requirements noted or issued as of the date hereof by any governmental
     department having authority as to lands, housing, buildings, fire, health,
     environmental and labor conditions affecting the Premises. The Premises
     shall be conveyed free of them at Closing. Seller shall furnish Purchaser
     with any authorizations necessary to make the searches that could
     disclose these matters.

9.   SELLER'S REPRESENTATIONS. (a) Seller represents and warrants to Purchaser
     that:
     (i)   The Premises abut or have a right of access to a public road;
     (ii)  Seller is the sole owner of the Premises and has the full right,
     power and authority to sell, convey and transfer the same in accordance
     with the terms of this contract;
     (iii) Seller is not a "foreign person", as that term is defined for
     purposes of the Foreign Investment in Real Property Tax Act, Internal
     Revenue Code ("IRC") Section 1445, as amended, and the regulations
     promulgated thereunder (collectively "FIRPTA");
     (iv)  The Premises are not affected by any exemptions or abatements of
     taxes; and
     (b)   Seller covenants and warrants that all of the representations and
     warranties set forth in this contract shall be true  and correct at
     Closing.
<PAGE>   4

     (c) Except as otherwise expressly set forth in this contract, none of
     Seller's covenants, representations, warranties or other obligations
     contained in this contract shall survive Closing.

10.  CONDITION OF PROPERTY.

     (a) This sale is conditioned upon the results of a Phase I (and Phase II,
     if necessary) Environmental Site Assessment showing no evidence of adverse
     environmental impact due to past and present use of the premises or release
      of hazardous materials on the premises. The Environmental Site Assessment
     shall be performed at the sole cost and expense of the purchaser and
     completed no later than (10) days prior to the closing as identified in
     Paragraph 13. The seller consents to the taking of any samples deemed
     necessary or appropriate by the testing firm.

     If the report shows evidence of adverse environmental impact, the purchaser
     may, cancel this agreement and upon the refund of the deposit, this
     agreement shall be of no further force or effect.

     (b) Purchaser shall have until ten (10) days prior to the closing, as
     identified in Paragraph 13, to conduct an inspection of the improvements on
     the premises by a licensed architect or engineer for the purpose of
     determining that the premises are free from major structural defects. In
     the event that the inspection reveals a material defect in the structural
     condition of the premises, Purchaser may give notice to Seller of
     Purchaser's election to rescind this contract, whereupon the Seller shall
     return to the Purchaser the down payment made hereunder and on such payment
     this contract shall thereupon become null and void.

11.  INSURABLE TITLE. Seller shall give and Purchaser shall accept such title
     as recognized New York State Title Insurance Company shall be willing to
     approve and insure in accordance with its standard form of title policy
     approved by the New York State Insurance Department, subject only to the
     matters provided for in this contract.

<PAGE>   5

12.  CLOSING, DEED, TITLE AND BILL OF SALE.  (a) "Closing" means the settlement
     of the obligations of Seller and Purchaser to each other under this
     contract, including the payment of the purchase price to Seller, and the
     delivery to Purchaser of a Bargain and Sale with covenant against grantor's
     acts deed in proper statutory short form for record, duly executed and
     acknowledged, so as to convey to Purchaser fee simple title to the
     Premises, free of all encumbrances, except as otherwise herein stated. The
     deed shall contain a covenant by Seller as required by subd. 5 of Section
     13 of the Lien Law.

     (b) The Seller shall also deliver possession of all items of personal
     property as set forth on Schedule B, as well as a Bill of Sale conveying
     good title to the same, free of all liens and encumbrances.

13.  CLOSING DATE AND PLACE. The Purchaser shall be obligated to proceed to
     closing at the Ganje Law Office, Two Tower Place, Albany, New York, or at a
     lending institution, within ninety (90) days after the time has expired to
     commence an Article 78 Proceeding against the Town of Stuyvesant modified
     Zoning Ordinance which would permit the industrial use of the subject
     premises as further defined in Paragraph "19(c)", provided, however, that
     no such proceedings have been commenced and are unresolved.

14.  CONDITIONS OF CLOSING.  This contract and Purchaser's obligation to
     purchase the Premises are also subject to and conditioned upon the
     fulfillment of the following conditions precedent:
     (a)  The accuracy, as of the date of Closing, of the representations and
     warranties of Seller made in this contract.
     (b)  The delivery by Seller to Purchaser of a duly executed Combined Real
     Estate Transfer Tax Return and Credit Line Mortgage Certificate (in form
     prescribed by law).
     (c)  The delivery by Seller to Purchaser of a certification stating that
     Seller is not a foreign person, which certification shall be in the form
     then required by FIRPTA.
     (d) The delivery of the Premises and all building(s) and improvements
     comprising a part thereof, vacant and free of leases or tenancies.
     (e)  All plumbing (including water supply and septic systems), heating and
     air conditioning, electrical and mechanical systems, equipment and
     machinery in the building(s) located on the property and all appliances
     which are included in this sale being in working order as of the date of
     Closing. The Seller shall insure that the water supply system shall have
     easements to insure access to the water source located off premises.
     (f)  The delivery by the parties of any other affidavits required as a
     condition of recording the deed.

<PAGE>   6

15.  DEED TRANSFER AND RECORDING TAXES.  At Closing, certified or official bank
     checks payable to the order of the appropriate State, City or County
     officer in the amount of any applicable transfer and/or recording tax
     payable by reason of the delivery or recording of the deed or mortgage, if
     any, shall be delivered by the party required by law or by this contract to
     pay such transfer and/or recording tax, together with any required tax
     returns duly executed and sworn to, and such party shall cause any such
     checks and returns to be delivered to the appropriate officer promptly
     after Closing. The obligation to pay any additional tax or deficiency and
     any interest or penalties thereon shall survive Closing.

16.  APPORTIONMENTS AND OTHER ADJUSTMENTS.  (a) To the extent applicable, the
     following shall be apportioned as of midnight of the day before the day of
     Closing:
     (i)  Taxes on the basis of the fiscal period for which assessed.
     (b)  If Closing shall occur before a new tax rate is fixed, the
     apportionment of taxes shall be upon the basis of the tax rate for the
     immediately preceding fiscal period applied to the latest assessed
     valuation.
     (c)  Any errors or omissions in computing apportionments or other
     adjustments at Closing shall be corrected within a reasonable time
     following Closing. This subparagraph shall survive Closing.

17.  ALLOWANCE FOR UNPAID TAXES, ETC.  Seller has the option to credit Purchaser
     as an adjustment to the purchase price with the amount of any unpaid taxes,
     assessments, water charges and sewer rents, together with any interest and
     penalties thereon to a date not less than five (5) business days after
     Closing, provided that official bills therefor computed to said date are
     produced at Closing.

18.  AFFIDAVIT AS TO JUDGMENTS, BANKRUPTCIES, ETC.  If a title examination
     discloses judgments, bankruptcies or other returns against persons having
     names the same as or similar to that of Seller, Seller shall deliver an
     affidavit at Closing showing that they are not against Seller.

19.  ZONING.
     (a) Seller represents to the Purchaser that the premises to be
     conveyed are located within a RR (Rural Recreational) Zoning District in
     the Town of Stuyvesant, Columbia County, New York. The Town of Stuyvesant
     Zoning Board of Appeals granted a Special Permit for the construction and
     use of the premises which are the subject of this agreement, dated August
     27, 1987. The Special Permit was issued pursuant to Article 411 of the
     Zoning Ordinance. The Special Permit allowed for the construction and use
     of an industrial facility not to exceed 50,000 square feet for BioForce of
     America, Inc. to grow, process, store and ship herbs grown on the 175 acres
     of land which are the subject of this
<PAGE>   7
     agreement. The Seller acknowledges that the industrial facility was
     constructed and used to store, process and ship herbs and other
     agricultural products.

     (b)Purchaser's obligation to purchase the premises are conditioned upon the
     Town Board of the Town of Stuyvesant amending the Zoning Ordinance of the
     Town of Stuyvesant to permit the use of the facility and at least fifteen
     (15) acres adjacent lands which are the subject of this agreement for
     "industrial purposes" as a permitted use under the ordinance without
     restrictions other than the issuance of site plan approval. Upon closing,
     the Lease Agreement between the Seller and the Purchaser of even date
     herewith, shall terminate and all obligations thereunder cease with prorata
     adjustments of rent to the day of closing.

20.  DEFAULTS AND REMEDIES.
     (a)If Purchaser defaults hereunder, Seller's sole remedy shall be to
     receive and retain the Downpayment as liquidated damages, it being agreed
     that Seller's damages in case of Purchaser's default might be impossible
     to ascertain and that the Downpayment constitutes a fair and reasonable
     amount of damages under the circumstances and is not a penalty.
     (b) If Seller defaults hereunder, Purchaser shall have such remedies as
     Purchaser shall be entitled to at law or in equity, including, but not
     limited to, specific performance.

21.  NOTICES. Any notice or other communication ("Notice") shall be in writing
     and either (a) sent by either of the parties hereto or by their respective
     attorneys who are hereby authorized to do so on their behalf or by the
     Escrowee, by registered or certified mail, postage prepaid, or by
     facsimile to either parties counsel.

22.  BROKER. Seller and Purchaser each represents and warrants to the other that
     it has not dealt with any broker in connection with this sale.

23.  POSSESSION. Possession of the premises herein shall be delivered to
     Purchaser on the closing date.

24.  AUTHORIZATION OF SALE. The Seller will provide a resolution of its board
     of directors authorizing the sale and delivery of the deed, and a
     certificate of the secretary or assistant secretary of the corporation
     certifying such resolution and setting forth facts showing that the
     transfer is in conformity with the requirements of Section 909 of the
     Business Corporation Law. The deed in such case shall contain a recital
     sufficient to establish compliance with that section.

25.  MISCELLANEOUS. (a) All prior understandings, agreements, representations
     and warranties, oral or written, between Seller and Purchaser are merged
     in this contract; it completely expresses their full agreement and has been
     entered into after full investigation,
<PAGE>   8

     neither party relying upon any statement made by anyone else that is not
     set forth in this contract.
     (b)  Neither this contract nor any provision thereof may be waived, changed
     or cancelled except in writing. This contract shall also apply to and bind
     the heirs, distributees, legal representatives, successors and permitted
     assigns of the respective parties. The parties hereby authorize their
     respective attorneys to agree in writing to any changes in dates and time
     periods provided for in this contract.
     (c)  Any singular word or term herein shall also be read as in the plural
     and the neuter shall include the masculine and feminine gender, whenever
     the sense of this contract may require it.
     (d)  The captions in this contract are for convenience of reference only
     and in no way define, limit or describe the scope of this contract and
     shall not be considered in the interpretation of this contract or any
     provision hereof.
     (e)  This contract shall not be binding or effective until duly executed
     and delivered by Seller and Purchaser.
     (f)  Seller and Purchaser shall comply with IRC reporting requirements, if
     applicable. This subparagraph shall survive Closing.
     (g)  Each party shall, at any time and from time to time, execute,
     acknowledge where appropriate and deliver such further instruments and
     documents and take such other action as may be reasonably requested by the
     other in order to carry out the intent and purpose of this contract. This
     subparagraph shall survive Closing.
     (h)  This contract is intended for the exclusive benefit of the parties
     hereto and, except as otherwise expressly provided herein, shall not be for
     the benefit of, and shall not create any rights in, or be enforceable by,
     any other person or entity.

     IN WITNESS WHEREOF, this contract has been duly executed by the parties
hereto.

                                        AVOBA, INC.

     /s/ David Ganje
---------------------------
David Ganje, Esq.   5/20/99             By:   /s/ A. Ruf       /s/ R. Baldinger
Escrowee                                   ----------------  -------------------
                                             A. Ruf            R. Baldinger
                                                               Seller

                                        Date:  May 18th, 1999

                                        AMERICAN BIO MEDICA CORPORATION

                                        By:   /s/
                                           -------------------------------------
                                                                       Purchaser

                        OFFICIAL LEGALIZATION  Back side

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