Document:

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                                                                     Exhibit 4.6

                                  June 9, 2000

Corrpro Companies, Inc.
1090 Enterprise Drive
Medina, Ohio 44256

Ladies and Gentlemen:

         Reference is made to that certain Note Purchase Agreement, dated as of
January 21, 1998 (as amended from time to time, the "NOTE AGREEMENT"), between
Corrpro Companies, Inc., an Ohio corporation (the "COMPANY"), and The Prudential
Insurance Company of America ("PRUDENTIAL"), pursuant to which the Company
issued and sold its 7.60% Senior Notes due January 15, 2008 in the original
aggregate principal amount of $30,000,000 (the "NOTES"). Capitalized terms used
herein and not otherwise defined herein shall have the meanings assigned to such
terms in the Note Agreement.

         Pursuant to the request of the Company and in accordance with the
provisions of paragraph 11C of the Note Agreement, the Company and the
undersigned holders of the Notes executing this letter agree as follows:

         SECTION 1. AMENDMENTS TO NOTE AGREEMENT. From and after the date this
Section 1 becomes effective in accordance with the terms of Section 3 hereof,
the Note Agreement is amended as follows:

         1.1. Paragraph 5 of the Note Agreement is amended by adding new
paragraphs 5I and 5J thereto, such paragraphs to read as follows:

                  "5I. SUBSEQUENT GUARANTORS. The Company covenants that if at
         any time any Person, which is not a Significant Subsidiary as of the
         Effective Date, shall become a Significant Subsidiary (other than a
         Foreign Subsidiary or a Subsidiary owned by a Foreign Subsidiary), the
         Company will cause such Person to execute and deliver to the holders of
         the Notes a Guaranty substantially in the form of the Guaranty
         delivered pursuant to the June 2000 Modification and will cause such
         Person to comply with the provisions of paragraph 5J hereof.

                  5J. DELIVERIES; FURTHER ASSURANCES. The Company covenants to,
         and to cause each Significant Subsidiary (other than a Foreign
         Subsidiary or a Subsidiary owned by a Foreign Subsidiary) to, until the
         Security Interest Release Date, at its sole expense, promptly execute
         and deliver, or cause to be executed and delivered, to the holders of
         the

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         Notes or the Collateral Agent, in due form for filing or recording (the
         Company hereby agrees to pay the cost of filing or recording the same
         (including without limitation any and all filing fees and recording
         taxes)) in all public offices necessary or deemed necessary by the
         Required Holder(s) or the Collateral Agent, such collateral
         assignments, security agreements, pledge agreements, mortgages,
         leasehold mortgages, warehouse receipts, bailee letters, consents,
         waivers, financing statements and other instruments and documents, and
         do such other acts and things, including, without limitation, all acts
         and things as the Required Holder(s) or the Collateral Agent may from
         time to time reasonably request, to establish and maintain to the
         satisfaction of the Required Holder(s) and the Collateral Agent a valid
         and perfected first priority security interest in favor of the
         Collateral Agent in all of the present and/or future Collateral free of
         all other Liens whatsoever (subject only to Permitted Liens), and to
         deliver to the Collateral Agent or the holders of the Notes such
         certificates, documents, instruments and opinions in connection
         therewith as may be reasonably requested by the Collateral Agent or the
         Required Holder(s), each in form and substance reasonably satisfactory
         to the Collateral Agent and the Required Holder(s); provided that
         neither the Company nor any Subsidiary shall be required to pledge more
         than 65% of the stock of any Foreign Subsidiary. In the event that the
         Company or any Subsidiary hereafter acquires any real property or
         interest in real property on which a Lien is required to be granted to
         the Collateral Agent pursuant to this paragraph, then the Company shall
         also supply to the Collateral Agent and the holders of the Notes, at
         the Company's sole cost and expense, a survey, environmental report,
         hazard insurance policy and a mortgagee's policy of title insurance
         from a title insurer reasonably acceptable to the Required Holder(s)
         insuring the validity of such Lien on the real property or interest in
         real property encumbered thereby, each in form and substance reasonably
         satisfactory to the Collateral Agent and the Required Holder(s). The
         Company hereby irrevocably makes, constitutes and appoints the
         Collateral Agent (and all other persons designated by the Collateral
         Agent for that purpose) as the Company's true and lawful agent and
         attorney-in-fact to, if the Company fails to do so as required upon the
         request of the Required Holder(s) or the Collateral Agent, sign the
         Company's name on any such agreements, instruments and documents
         referred to in the preceding sentences and to deliver such agreements,
         instruments and documents to such Persons as the Required Holder(s) or
         the Collateral Agent in their sole discretion may elect."

         1.2. Paragraph 6A(2) of the Note Agreement is amended in its entirety
to read as follows:

                  "6A(2). INTEREST COVERAGE RATIO. The Interest Coverage Ratio
         to be less than (i) 2.00 to 1.00 at the end of the fiscal quarter
         ending March 31, 2000 or June 30, 2000, (ii) 1.95 to 1.00 at the end of
         the fiscal quarter ending September 30, 2000, or (iii) 2.00 to 1.00 at
         the end of any fiscal quarter ending after September 30, 2000."

         1.3. Paragraph 6A(3) of the Note Agreement is amended in its entirety
to read as follows:

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<PAGE>   3

                  "6A(3). DEBT COVERAGE RATIO. The Debt Coverage Ratio to exceed
         (i) 4.00 to 1.00 at any time on or before March 31, 2000, (ii) 4.50 to
         1.00 at any time after March 31, 2000 and on or before June 30, 2000,
         (iii) 4.60 to 1.00 at any time after June 30, 2000 and on or before
         September 30, 2000, (iv) 4.25 to 1.00 at any time after September 30,
         2000 and on or before December 31, 2000, (v) 3.25 to 1.00 at any time
         after December 31, 2000 and on or before March 31, 2002, or (vi) 3.00
         to 1.00 at any time after March 31, 2002."

         1.4. Paragraph 6A of the Note Agreement is amended by adding new
paragraph 6A(4) thereto, such paragraph 6A(4) to read as follows:

                  "6A(4). FIXED CHARGE COVERAGE RATIO. The Fixed Charge Coverage
         Ratio, determined as of the end of any fiscal quarter, to be less than
         (i) 1.40 to 1.00 for the quarter ending March 31, 2000 or June 30,
         2000, (ii) 1.45 to 1.0 for the quarter ending September 30, 2000, or
         (iii) 1.50 to 1.00 for any fiscal quarter ending thereafter."

         1.5. Paragraph 6B(1) of the Note Agreement is amended (i) by amending
the definition of "Permitted Liens" contained therein to mean the Liens
specified in clause (i) - (vii) of paragraph 6B(i), (ii) by renumbering existing
clause "(vii)" thereof as clause "(viii)", and (iii) by adding new clause (vii)
thereof, such clause (vii) to read as follows:

                           "(vii) Until the Security Interest Release Date,
                  Liens in favor of the Collateral Agent, provided that the
                  Intercreditor Agreement shall be in full force and effect,
                  such Liens, and the Debt secured thereby, shall be subject to
                  the Intercreditor Agreement, and the holders of such Debt
                  shall be parties to the Intercreditor Agreement."

         1.6. Paragraph 6 of the Note Agreement is amended by adding new
paragraphs 6C, 6D and 6E thereto, such paragraphs to read as follows:

                  "6C. ACQUISITIONS. The Company will not, nor will it permit
         any Subsidiary to, make any Acquisition of any Person, except
         Acquisitions so long as (A) the Company or a Subsidiary shall be the
         surviving or continuing corporation thereof, so long as any new
         Subsidiary formed in connection with such Acquisition within sixty (60)
         days of such Acquisition, either (x) is merged into the Company, or (y)
         executes a Guaranty limited to the consideration paid by the Company or
         such Subsidiary in connection with such Acquisition, (B) immediately
         before and after such merger or Acquisition, no Default or Event of
         Default shall exist or shall have occurred and be continuing and the
         representations and warranties contained in paragraph 8 shall be true
         and correct on and as of the date thereof (both before and after such
         Acquisition is consummated) as if made on the date such Acquisition is
         consummated, (C) the aggregate amount paid or payable in cash for (x)
         all such Acquisitions by the Company during any fiscal year and until
         March 31, 2002 does not exceed $15,000,000, and (y) all such
         Acquisitions by the Company after the Effective Date through March 31,
         2002 does not exceed $30,000,000, (D) after giving effect to such
         Acquisition, the Available Aggregate Commitment (as

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         defined in the Credit Agreement as in effect on the Effective Date)
         shall be not less than $6,250,000, and (E) prior to the consummation of
         any such Acquisition which would result in the total consideration paid
         or to be paid by the Company for Acquisitions since the Effective Date
         through March 31, 2002 to exceed $3,000,000, the Company shall have
         provided to the holders of the Notes a certificate of the chief
         financial officer of the Company (attaching computations and pro forma
         financial statements to demonstrate pro forma compliance with all
         financial covenants hereunder both before and after such Acquisition
         has been completed), stating that (x) such Acquisition complies with
         this paragraph 6C, (y) the Debt Coverage Ratio, both before and after
         such Acquisition has been completed, does not exceed 3.00 to 1.00, and
         (z) that any other conditions under this Agreement relating to such
         transaction have been satisfied. For purposes of calculating
         consideration to be paid in connection with any Acquisition, the amount
         of any earn-out which may be paid by the Company in connection with
         such Acquisition shall be excluded. Notwithstanding the foregoing, the
         Company and its Subsidiaries may make investments in joint ventures;
         provided that, from and after the Effective Date and through March 31,
         2002, such investments shall not exceed in an aggregate amount (i)
         $1,000,000 with respect to any joint venture, and (2) $3,000,000 in the
         aggregate.

                  6D. MOST FAVORED LENDER. Unless otherwise specified in writing
         by the Required Holder(s), the Company will not, and will not permit
         any Subsidiary to, agree to, with or for the benefit of the holder(s)
         of any other Debt of the Company or any Subsidiary in an aggregate
         outstanding principal amount in excess of $2,000,000 or with or for the
         benefit of Persons with commitments to provide loans or other financial
         accommodations to the Company or any Subsidiary in an aggregate amount
         in excess of $2,000,000, any financial or restrictive covenants or
         events of default which are more restrictive than, or in addition to,
         the financial or negative covenants or Events of Default contained in
         this Agreement, unless the Company has entered into, or has caused such
         Subsidiary to enter into, an agreement with the holders of the Notes,
         in form and substance reasonably satisfactory to the holders of the
         Notes, whereby such financial or negative covenants or events of
         default are added to this Agreement for the benefit of the Notes, and
         any conditions precedent to the effectiveness of such agreement have
         been satisfied; provided, however, that the foregoing provisions shall
         not require the Company to cause the provisions of Section 6.19.3 of
         the Credit Agreement, as in effect on the Effective Date, to be added
         to this Agreement.

                  6E. FINANCIAL CONTRACTS. The Company will not, nor will it
         permit any Subsidiary to, enter into or remain liable upon any
         Financial Contract for purposes of financial speculation."

         1.7. Paragraph 7A of the Note Agreement is amended by the following new
clauses (xiv) and (xv) thereto:

                           "(xiv) any Guaranty shall cease to be in full force
                  and effect with respect to any Guarantor, any Guarantor shall
                  fail (subject to any applicable grace period) to comply with
                  or to perform any applicable provision of a Guaranty, or any

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                  Guarantor (or any Person by, through or on behalf of such
                  Guarantor) shall deny in any manner the validity, binding
                  nature or enforceability of a Guaranty with respect to such
                  Guarantor; or

                           (xv) prior to the Security Interest Release Date any
                  Collateral Document shall cease to be in full force and effect
                  in any material respect with respect to the Company or any
                  Guarantor, the Company or any Guarantor shall fail (subject to
                  any applicable grace period) to comply with or to perform any
                  applicable provision of any Collateral Document to which such
                  entity is a party, or the Company or any Guarantor (or any
                  Person by, through or on behalf of the Company or such
                  Guarantor) shall deny in any manner the validity, binding
                  nature or enforceability of any Collateral Document; or"

         1.8. The definition of "Consolidated Cash Flow from Operations" in
paragraph 10B of the Note Agreement is amended by adding the following to the
end thereof:

         ", adjusted to add back unusual charges not in excess of $2,000,000
         recorded during the fiscal quarter ended March 31, 2000 relating to
         legal fees or a reserve established therefor and the discontinuance of
         certain product lines of the Company."

         1.9. Clause (ii) of the definition of "Permitted Investments" in
paragraph 10B of the Note Agreement is amended by adding the following to the
end thereof:

         "; provided that such purchase or acquisition is permitted under
paragraph 6C hereof;"

         1.10. Clause (xi) of the definition of "Permitted Investments" in
paragraph 10B of the Note Agreement is amended by adding the following to the
end thereof:

         "; and further provided that such acquisition is permitted under
paragraph 6C hereof."

         1.11. Paragraph 10B of the Note Agreement is amended to delete the term
"Credit Agreement" presently appearing therein and to add the following defined
terms thereto in appropriate alphabetical order:

                  "ACQUISITION" shall mean any transaction, or any series of
         related transactions, consummated on or after the Effective Date, by
         which the Company or any of its Subsidiaries (i) acquires any going
         business or all or substantially all of the assets of any firm,
         corporation or limited liability company, or division thereof, whether
         through purchase of assets, merger or otherwise or (ii) directly or
         indirectly acquires (in one transaction or as the most recent
         transaction in a series of related transactions) at least a majority
         (in number of votes) of the securities of a corporation which have
         ordinary voting power for the election of directors (other than
         securities having such power only by reason of the happening of a
         contingency) or a majority (by percentage or voting power) of the
         outstanding ownership interests of a partnership or limited liability
         company.

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<PAGE>   6

                  "BANK AGENT" shall mean Bank One, Michigan, in its capacity as
         agent for the Banks under the Credit Agreement, and its successors and
         assigns in that capacity.

                  "BANKS" shall mean Bank One, Michigan, PNC Bank, Key Bank,
         First Merit Bank, Comerica Bank and Fifth Third Bank, Northeastern
         Ohio, and their respective successors and assigns.

                  "CAPITALIZED LEASE" of a Person shall mean any lease of
         property by such Person as lessee which would be capitalized on a
         balance sheet of such Person prepared in accordance with GAAP.

                  "COLLATERAL" shall mean all accounts, accounts receivable,
         inventory, machinery, equipment, general intangibles, real estate,
         fixtures and all other tangible or intangible property, real, personal
         or mixed, of the Company and its Domestic Subsidiaries, whether now
         owned or hereafter acquired and whether now or hereafter existing.

                  "COLLATERAL AGENT" shall mean Bank One, Michigan, in its
         capacity as collateral agent under the Intercreditor Agreement, and its
         successors and assigns in that capacity.

                  "COLLATERAL DOCUMENTS" shall mean the Security Agreement, the
         Mortgages, and any other agreement, document or instrument in effect on
         the Effective Date or executed by the Company or any Subsidiary after
         the Effective Date under which the Company or such Subsidiary has
         granted a lien upon or security interest in any property or assets to
         the Collateral Agent to secure all or any part of the obligations of
         the Company under this Agreement or the Notes or of any Guarantor under
         any Guaranty, and all financing statements, certificates, documents and
         instruments relating thereto or executed or provided in connection
         therewith, each as amended, restated, supplemented or otherwise
         modified from time to time.

                  "CREDIT AGREEMENT" shall mean the Amended and Restated Credit
         Agreement, dated as of June 9, 2000, among the Company, CSI Coating
         Systems, Inc., the Bank Agent and the Banks, as amended, restated,
         supplemented or otherwise modified from time to time.

                  "DOMESTIC SUBSIDIARY" shall mean any Subsidiary of the Company
         which is not a Foreign Subsidiary.

                  "EFFECTIVE DATE" shall have the meaning given such term in the
         June 2000 Modification.

                  "FINANCIAL CONTRACT" shall mean (i) any exchange-traded or
         over-the-counter futures, forward, swap or option contract or other
         financial instrument with similar characteristics, or (ii) any Rate
         Hedging Agreement.

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<PAGE>   7

                  "FIXED CHARGE COVERAGE RATIO" shall mean, as of the last day
         of any fiscal quarter, the ratio of (a) Consolidated Cash Flow from
         Operations plus Rentals paid or payable, minus capital expenditures
         made, to (b) Fixed Charges, in each case as calculated for the four
         consecutive fiscal quarters then ending and in each case of the Company
         and its Subsidiaries on a consolidated basis in accordance with GAAP.

                  "FIXED CHARGES" shall mean for any period the sum, without
         duplication, of (a) interest expense during such period, plus (b) all
         payments of principal and other sums required to be paid during such
         period with respect to Debt (excluding principal payments on the
         Notes), plus (c) Rentals paid or payable during such period, plus (d)
         all dividends, distributions and other obligations paid with respect to
         any class of capital stock or any dividend, payment or distribution
         paid in connection with the redemption, purchase, retirement or other
         acquisition, directly or indirectly, of any shares of capital stock
         during such period, in each case of the Company and its Subsidiaries on
         a consolidated basis in accordance with GAAP.

                  "FOREIGN SUBSIDIARY" shall mean each Subsidiary of the Company
         which is organized under the laws of any jurisdiction other than, and
         which is conducting the majority of its business outside of, the United
         States or any state thereof.

                  "GUARANTOR" shall mean, on any day, each Subsidiary that has
         executed a Guaranty or a counterpart of the Guaranty on or prior to
         that day.

                  "GUARANTY" shall mean the guaranty executed by various
         Subsidiaries delivered pursuant to Section 3(b)(ii) of the June 2000
         Modification and any other guaranty of the Notes executed by any
         Subsidiary.

                  "INTERCREDITOR AGREEMENT" shall mean the Intercreditor and
         Collateral Agency Agreement, dated as of June 9, 2000 among the Bank
         Agent, the Collateral Agent, the Banks and the holders of the Notes.

                  "JUNE 2000 MODIFICATION" shall mean that certain letter
         agreement, dated June 9, 2000, between the Company and the holders of
         the Notes amending this Agreement.

                  "MORTGAGE" shall mean the mortgages, deeds of trust, leasehold
         mortgages or similar instrument from the Company and various
         Subsidiaries delivered pursuant to Section 3(b)(iv) of the June 2000
         modification.

                  "RATE HEDGING AGREEMENT" shall mean an agreement, device or
         arrangement providing for payments which are related to fluctuations of
         interest rates, exchange rates or forward rates, including, but not
         limited to, dollar-denominated or cross-currency interest rate exchange
         agreements, forward currency exchange agreements, interest rate cap or
         collar protection agreements, forward rate currency or interest rate
         options, puts and warrants.

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<PAGE>   8

                  "RENTALS" shall mean the aggregate fixed amounts payable under
         any lease of property (other than a Capitalized Lease) which has an
         original term (including any required renewals and any renewals
         effective at the option of the lessor) of one year or more.

                  "SECURITY AGREEMENT" means the Security Agreement among the
         Company, various Subsidiaries and the Collateral Agent, delivered
         pursuant to Section 3(b)(iii) of the June 2000 Modification.

                  "SECURITY INTEREST RELEASE DATE" shall mean the date upon
         which all Liens in favor of the Collateral Agent have been fully
         released and terminated to the reasonable satisfaction of the Required
         Holder(s), provided that no Default or Event of Default shall then be
         in existence.

                  "SIGNIFICANT SUBSIDIARY" means any Subsidiary identified as
         such on Schedule 10B and any other Subsidiary or Subsidiaries of the
         Company if considered in the aggregate as one Subsidiary, which would
         constitute (i) 10% or more of the Company's consolidated total assets;
         or (ii) 10% or more of the Company's consolidated revenues for the most
         recent four fiscal quarters.

         1.12. Section 1.3 of the March 29, 1999 letter agreement amending the
Note Agreement is deleted effective for each fiscal quarter ending on or after
June 30, 2000.

         1.13. In addition to interest accruing on the Notes, the Company agrees
to pay to the holder(s) of such Notes a fee (the "Leverage Fee") with respect to
each fiscal quarter, beginning with the fiscal quarter ending June 30, 2000,
during which the Debt Coverage Ratio equaled or exceeded 2.75 to 1.00 at any
time (a "Leverage Event"). The Leverage Fee payable with respect to each Note
shall be a dollar amount equal to the product obtained by multiplying (a)
Applicable Factor times (b) the "Weighted Dollar Average" of outstanding
principal balance of such Note during the applicable quarter in which the
Leverage Event occurred. The Leverage Fee shall be payable in arrears and due on
the next interest payment due date which falls on or after the last day of the
fiscal quarter in which the Leverage Event occurred. With respect to any fiscal
quarter, the Leverage Fee shall only be payable for the first Leverage Event to
occur in such fiscal quarter (but the Applicable Factor for such fiscal quarter
shall be determined as provided below based upon all Leverage Events which
occurred during such fiscal quarter). The acceptance of the Leverage Fee by any
holder of a Note shall not constitute a waiver of any Default or Event of
Default. The "Applicable Factor" for any fiscal quarter shall be equal to (a)
 .0025 if at any time during such fiscal quarter the Debt Coverage Ratio equaled
or exceeded 4.00 to 1.00, (b) .001875 if at any time during such fiscal quarter
the Debt Coverage Ratio equaled or exceeded 3.50, but at no time during such
fiscal quarter did the Debt Coverage Ratio equal or exceed 4.00 to 1.00, and (c)
 .00125 if at no time during such fiscal quarter did the Debt Coverage Ratio
equal or exceed 3.50 to 1.00. As used herein, the term "Weighted Dollar Average"
shall mean, with respect to any Note, during any fiscal quarter of the Company,
a dollar amount determined by adding together the daily outstanding principal
balance of such Note during such

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fiscal quarter and dividing the amount thus obtained by the total number of days
during such fiscal quarter.

         SECTION 2. REPRESENTATIONS AND WARRANTIES. The Company represents and
warrants to each of the undersigned that (a) this letter has been duly
authorized, executed and delivered by the Company, (b) each representation and
warranty set forth in paragraph 8 of the Note Agreement is true and correct as
of the date of the execution and delivery of this letter by the Company with the
same effect as if made on such date (except to the extent such representations
and warranties expressly refer to an earlier date, in which case they were true
and correct as of such earlier date) and (c) no Default or Event of Default
exists and, after giving effect to the amendments to the Note Agreement in
Section 1 hereof, no Event of Default or Default will exist.

         SECTION 3. EFFECTIVENESS. The amendments described in Section 1 above
shall become effective as of June 9, 2000 (the "EFFECTIVE DATE") when each
holder of a Note executing this letter has received (unless otherwise waived by
the Required Holders):

                  (a) the fee referred to in Section 4 below and all costs and
         expenses of such holder (including reasonable fees and disbursements of
         special counsel to such holder) in connection with this letter;

                  (b) the following documents, each in a form and substance
         satisfactory to such holder:

                           (i) counterparts of this letter agreement executed by
                  the Company and the Required Holder(s);

                           (ii) a guaranty, signed by each Domestic Subsidiary
                  (excluding inactive Subsidiaries);

                           (iii) a pledge and security agreement signed by the
                  Company and each Guarantor, together with evidence,
                  satisfactory to the Purchasers, that the Company and each
                  Guarantor have delivered to the Collateral Agent all financing
                  statements and other documents necessary to perfect the
                  Collateral Agent's Lien on all collateral granted under the
                  Security Agreement and all stock certificates, stock powers
                  and other items required to be delivered in connection
                  therewith;

                           (iv) mortgages, deeds of trust, leasehold mortgages
                  or similar instruments, executed by the Company and each
                  Guarantor owning or leasing any real property with respect to
                  all real estate owned or leased by the Company or any
                  Guarantor;

                           (v) the Intercreditor Agreement, signed by the
                  Collateral Agent, the Bank Agent and the Banks and consented
                  to by the Company and the Guarantors; and

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<PAGE>   10

                           (vi) an amendment and restatement of the Credit
                  Agreement executed by the Company, the Agent and the Banks.

                  (c) All corporate and other proceedings in connection with the
         transactions contemplated by this letter agreement shall be
         satisfactory to such holder and its counsel, and such holders shall
         have received all such counterpart originals or certified or other
         copies of such documents as it may reasonably request.

         SECTION 4. FEES. In consideration of holders of Notes entering into
this letter agreement, the Company agrees to pay, on or before the Effective
Date, ratably to holders of the Notes in accordance with the respective
outstanding principal amounts thereof, an aggregate fee of $ .

         SECTION 5. REFERENCE TO AND EFFECT ON NOTE AGREEMENT. Upon the
effectiveness of this letter, each reference to the Note Agreement in any other
document, instrument or agreement shall mean and be a reference to the Note
Agreement as modified by this letter. Except as specifically set forth in
Section 1 hereof, the Note Agreement shall remain in full force and effect and
is hereby ratified and confirmed in all respects.

         SECTION 6. GOVERNING LAW. THIS LETTER SHALL BE CONSTRUED AND ENFORCED
IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF ILLINOIS, WITHOUT REGARD TO
PRINCIPLES OF CONFLICT OF LAWS OF SUCH STATE WHICH WOULD OTHERWISE CAUSE THIS
LETTER TO BE CONSTRUED OR ENFORCED OTHER THAN IN ACCORDANCE WITH THE LAWS OF THE
STATE OF ILLINOIS.

            [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

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         SECTION 6. COUNTERPARTS; SECTION TITLES. This letter may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed to be
an original and all of which taken together shall constitute but one and the
same instrument. The section titles contained in this letter are and shall be
without substance, meaning or content of any kind whatsoever and are not a part
of the agreement between the parties hereto.

<TABLE>
<S>                                                  <C>
                                                     Very truly yours,

                                                     THE PRUDENTIAL INSURANCE COMPANY OF AMERICA

                                                     By:
                                                        ----------------------------------------
                                                        Vice President

AGREED AND ACCEPTED:

CORRPRO COMPANIES, INC.

By:
   --------------------------------------
   Title:
</TABLE>

                                       11<PAGE>   1
                                  EXHIBIT 10.17

                                FOURTH AMENDMENT
                                       TO
                     THIRD AMENDED AND RESTATED CONSOLIDATED
               REPLACEMENT CREDIT FACILITY AND SECURITY AGREEMENT
               --------------------------------------------------

                  THIS FOURTH AMENDMENT TO THIRD AMENDED AND RESTATED
CONSOLIDATED REPLACEMENT CREDIT FACILITY AND SECURITY AGREEMENT (this
"Agreement") dated as of April 1, 2000, is entered into by and between
INTERNATIONAL TOTAL SERVICES, INC., an Ohio corporation ("Borrower"), and BANK
ONE, N.A., successor in interest by merger to BANK ONE, CLEVELAND, N.A., a
national banking association, as agent bank for itself and for THE PROVIDENT
BANK, an Ohio banking company (collectively, the "Lender").

                                   WITNESSETH
                                   ----------

                  WHEREAS, the Borrower and the Lender are parties to that
certain Third Amended and Restated Consolidated Replacement Credit Facility and
Security Agreement dated as of March 31, 1997, as amended by that certain First
Amendment dated as of October 10, 1997, that certain Second Amendment dated as
of December 16, 1998 and that certain Third Amendment dated as of September 14,
1999 (the "Loan Agreement"; all terms defined in the Loan Agreement being used
herein shall have the same meanings), pursuant to which the Lender has agreed to
make a $25,000,000 Revolving Loan to the Borrower until March 31, 2000,
evidenced by a Second Amended and Restated Promissory Note dated September 14,
1999 and payable to the Lender, such Note being payable on March 31, 2000; and

                  WHEREAS, the Borrower and the Lender agreed to amend the Loan
Agreement (i) to extend the maturity date of the Revolving Loan to April 1,
2001; and, (ii) to modify certain definitions in Section 1 of the Loan
Agreement, to modify certain provisions of Section 2 of the Loan Agreement and
to modify certain covenants in Section 8 of the Loan Agreement.

                  NOW THEREFORE, in consideration of the foregoing and the
mutual covenants and agreements contained herein, and for other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the Borrower and the Lender agree as follows:

                                    AGREEMENT
                                    ---------

Section 1.        AMENDMENT OF LOAN AGREEMENT.

                  Except as expressly modified herein, all terms, conditions,
definitions and provisions of the Third Amended and Restated Consolidated
Replacement Credit Facility and Security Agreement and the First, Second and
Third Amendment thereto, are in full force and effect.

                  1. The definitions of "Contract Rate" and "Notes" set forth in
Section 1 of the Agreement are, effective on the Effective Date (defined in
Section 2 below), hereby amended and restated to read in their entirety as
follows:

<PAGE>   2

                           1. CONTRACT RATE - A fluctuating rate equal to
                  three-quarters of one percent (0.75%) above the Base Rate;
                  provided, however, that if on or before December 31, 2000, the
                  Borrower does not pay all Obligations to the Lender in full,
                  then, retroactive to the Effective Date, it shall be a
                  fluctuating rate equal to one and one-quarter percent (1.25%)
                  above the Base Rate (which differential shall be due and
                  payable to Lender on January 2, 2001), and from and after
                  January 1, 2001, it shall be a fluctuating rate equal to one
                  and one-half percent (1.50%) above the Base Rate.

                           2. NOTES - The Third Amended and Restated Replacement
                  Promissory Note (Revolving Loan) and any other promissory note
                  or other instrument evidencing Borrower's obligation to repay
                  any Obligations.

                  2. Subsections 2.3(A), (B) and (C) of the Loan Agreement are,
effective on the Effective Date, amended and restated to read in their entirety
as follows:

                           2.3 REVOLVING LOAN.

                                    (1) REVOLVING LOAN. Subject at all times to
                           the terms hereof, the Lender will, from and after
                           April 1, 2000 and until April 1, 2001, make such
                           loans to the Borrower as from time to time the
                           Borrower requests (the "Revolving Loan") consisting
                           of advances made by Lender against the value of
                           Eligible Accounts-Domestic. Subject to the provisions
                           of Subsection (B) of this Section 2.3, the aggregate
                           unpaid principal of the Revolving Loan outstanding at
                           any one time shall not exceed the lesser of: (a) the
                           line of credit approved for Borrower, which is
                           currently Twenty-Five Million Dollars ($25,000,000),
                           less the face amount of all outstanding Letters of
                           Credit issued by Lender for the account of Borrower;
                           or, (b) eighty-five percent (85%) of the unpaid face
                           amount of Eligible Accounts-Domestic (or such other
                           percentages of Eligible Accounts-Domestic as may from
                           time to time be fixed by the Lender upon notice to
                           the Borrower), less the face amount of any
                           outstanding Letters of Credit.

                           For the purposes of this agreement, the Borrower may
                           include in its borrowing base certificate, as
                           Eligible Accounts - Domestic, the anticipated tax
                           refund for the year ending March 31, 2000, which is
                           estimated to be $2,400,000. Upon filing by the
                           Borrower, for the tax refund the Borrower shall use
                           in the Borrowing Base Certificate the actual amount
                           of the requested refund as determined or verified by
                           their independent auditors.

                                    (2) PAYMENT. The Revolving Loan shall be due
                           and payable on April 1, 2001, and bear interest at
                           the Contract Rate and shall otherwise be evidenced
                           by, and repayable in accordance with, the Note, but,
                           in the absence of such revolving promissory note,
                           shall be evidenced by the Lender's record of
                           disbursements and repayments.

                                       2
<PAGE>   3

                                    (3) The form of Borrower's Certificate
                           attached to the Loan Agreement as EXHIBIT A is,
                           effective on the Effective Date, hereby deleted, and
                           the form of Borrower's Base Certificate attached to
                           this Agreement as EXHIBIT C is hereby substituted
                           therefor.

Section 2.        EFFECTIVE DATE OF THE AGREEMENT.

                  The effective date of this Agreement ("Effective Date") shall
be April 1, 2000 but Lender shall have no duty to fund until the date on which
all conditions precedent have been satisfied, or waived by the Lender in
writing.

Section 3.        CONDITIONS PRECEDENT.

                  Borrower hereby acknowledges and agrees that the effectiveness
of this Agreement is conditioned upon the receipt by the Lender, on or prior to
the date hereof, in form and substance satisfactory to the Lender and its
counsel, of the following:

                  3. A certificate, dated as of the date hereof, signed by the
Chief Executive Officer of Borrower certifying that:

                           1. As of such date, no Event of Default has occurred
                  and is continuing, and no event has occurred and is continuing
                  that, with the giving of notice or passage of time, or both,
                  would be an Event of Default; and

                           2. The representations and warranties of Borrower set
                  forth in Section 7 of the Loan Agreement are true and correct
                  as of such date; and

                           3. Borrower is in compliance with all of the terms
                  and conditions set forth in the Loan Agreement on and as of
                  such date.

                  4. A certificate, dated as of the date hereof, signed by the
Secretary of Borrower certifying as follows:

                           1. Borrower's Articles of Incorporation and Code of
                  Regulations have not been modified or amended since June 17,
                  1997 (or certifying that true, correct and complete copies of
                  all such modifications and amendments are attached thereto);
                  and

                           2. Copies of resolutions of Borrower's Board of
                  Directors are attached thereto with respect to the approval of
                  this Agreement and of the matters contemplated hereby and
                  authorizing the execution, delivery and performance of this
                  Agreement and each other document, instrument, agreement or
                  note to be delivered pursuant hereto; and

                                       3

<PAGE>   4

                           3. As to the incumbency and signatures of the
                  officers of Borrower signing this Agreement and each other
                  document, instrument, agreement or note to be delivered
                  pursuant hereto.

                  5. The Third Amended and Restated Replacement Promissory Note
(Revolving Loan) in the form of EXHIBIT A attached hereto, with all blanks
completed, duly executed and delivered by Borrower to Lender.

                  6. An Acknowledgment, Consent and Agreement in the form of
EXHIBIT B attached hereto, with all blanks completed, duly executed and
delivered by the Guarantors to Lender as identified in Schedule 1 attached
hereto.

                  7. The written opinion of counsel for Borrower as to the
enforceability of this Agreement, the Loan Agreement, Note and each of the other
Credit Documents and covering such other issues thereunder as requested by
Lender and its counsel.

                  8. Such other documents, instruments, agreements and notes as
the Lender may reasonably request to implement this Agreement and the
transactions contemplated hereby and by the Loan Agreement.

Section 4.        WARRANTS.

                  Contemporaneously with the execution of this Agreement, the
Borrower shall deliver to the Lender 300,000 warrants pursuant to the Common
Stock Warrant Agreement attached as EXHIBIT D (collectively, the "Warrants").
The grant and delivery of the Warrants to the Lender is a material inducement
for the Lender to enter into this Agreement.

Section 5.        FACILITY FEE.

                  Contemporaneously with the execution of this Agreement,
Borrower shall pay to Lender a Facility Fee of $32,150.00.

Section 6.        COVENANTS AND CONTINUING AGREEMENTS.

                  A. Subsections 8.1(O), 8.1(P), 8.1(Q), and 8.2(F) of the Loan
Agreement are, effective on the Effective Date, amended and restated to read in
their entirety as follows:

                           (O) Maintain a Tangible Net Worth equal to or greater
                           than (i), as of March 31, 2000, ($16,000,000), (ii),
                           as of June 30, 2000, ($17,500,000), (iii), as of
                           September 30, 2000, ($18,200,000), (iv), as of
                           December 31, 2000, ($17,100,000), and (v), as of
                           March 31, 2001, ($16,100,000). Such Tangible Net
                           Worth is to be calculated each quarter in accordance
                           with GAAP, based upon Borrower's quarterly financial
                           statements, and maintain Stockholder Equity equal to
                           or greater than (i) as of March 31, 2000,
                           $16,000,000, (ii) as of June 30, 2000, $14,500,000,
                           (iii) as of September 30, 2000, $13,800,000,

                                       4
<PAGE>   5

                           (iv) as of December 31, 2000, $14,900,000, and (v) as
                           of March 31, 2001, $15,900,000.

                           (P) Maintain Debt Coverage (as defined below) (i), as
                           of June 30, 2000, of not less than 3.0 to 1, (ii), as
                           of September 30, 2000, of not less than 3.0 to 1,
                           (iii), as of December 31, 2000, of not less than 3.5
                           to 1, and (iv) as of March 31, 2001 of not less than
                           4.0 to 1. Debt Coverage, as such term is used in this
                           Section 8.1(P), means the ratio, measured on
                           cumulative basis for fiscal year 2001 up to the date
                           of measurement, of Borrower's (a)(i) net income plus
                           (ii) depreciation and amortization, plus (iii) net
                           interest paid to Lender, plus (iv), the Borrower's
                           estimated tax refund for the year ending March 31,
                           2000, less (b) the sum of (i) any dividends paid to
                           Borrower's shareholders, plus (ii) purchases of
                           treasury stock, plus (iii) Capital Expenditures, to
                           the amount of all principal and interest payable to
                           Lender, calculated quarterly in accordance with GAAP
                           based upon Borrower's quarterly and fiscal year-end
                           financial statements.

                           (Q) The covenants set forth in paragraph 8.1(Q) are
                           hereby deleted.

                  B. Subsection 8.2(F) of the Loan Agreement is, effective on
the Effective Date, amended and restated to read in its entirety as follows:

                           (F) Become or be liable in respect of any Guaranty
                           except (i) by endorsement of instruments or items of
                           payment in the ordinary course of business for
                           deposit and collection, and (ii) the obligations on
                           Schedule 2 attached to the "Fourth Amendment to Third
                           Amended and Restated Consolidated Replacement Credit
                           Facility and Security Agreement" dated as of April 1,
                           2000, between Borrower and Lender.

Section 7.        TRUST AGREEMENT.

                  Section 11.1(D) of the Loan Agreement is, effective on the
Effective Date, amended to add the following as the last sentence thereof:

                           For the purposes of this Section 11.1(D), the term
                           "Material Agreement" includes that certain Voting
                           Trust Agreement entered into between the Borrower,
                           Robert Weitzel, H. Jeffrey Schwartz, J. Jeffrey
                           Eakin, and John P. O'Brien.

Section 8.        REFERENCES.

                  On and after the Effective Date of this Agreement, each
reference in the Loan Agreement to "this Agreement", "hereunder", "hereof", or
words of like import referring to the Loan Agreement, and in the Note to the
"Loan Agreement", "thereof", or words of like import referring to the Loan
Agreement, shall mean and refer to the Loan Agreement and shall be deemed to
refer to

                                       5
<PAGE>   6

the form of Borrowing Base Certificate attached hereto as EXHIBIT C. References
to EXHIBIT C-1 in the definition of "Revolving Note" in the Loan Agreement
shall be deemed to refer to the Note, a copy of which is attached hereto as
EXHIBIT A. The Loan Agreement, as previously amended and as amended by this
Agreement, and all Credit Documents are and shall continue to be in full force
and effect and are hereby and in all respects ratified and confirmed.
References to the Loan Agreement in the Note shall be deemed to include all
amendments to the Loan Agreement whether specified in the Note or not.

Section 9.        APPLICABLE LAW.

                  This Agreement shall be deemed to be a contract under the laws
of the State of Ohio, and for all purposes shall be construed in accordance with
the laws of the State of Ohio.

Section 10.       RELEASE.

                  The Borrower hereby represents and warrants to the Lender, and
agrees with the Lender, that it has no claim or offset against, or defense or
counterclaim to, any Obligation or Indebtedness to the Lender under the Loan
Agreement or other Credit Documents and, in consideration of this Agreement, the
Borrower hereby releases and discharges the Lender and its shareholders,
directors, officers, employees, attorneys, affiliates and subsidiaries from any
and all claims, demands, liability and causes of action whatsoever, now known or
unknown, existing on the Effective Date and arising prior to the date hereof and
arising out of or in any way related to Obligations, the Loan Agreement, this
Agreement, or any security interest related thereto or the administration of the
Revolving Loan or any other Indebtedness of Borrower, the Guarantors, or any
Affiliate to the Lender.

Section 11.       COUNTERPARTS.

                  This Agreement may be executed in any number of counterparts,
all of which taken together shall constitute one and the same instrument, and
any one of the parties hereto may execute this Agreement by signing any such
counterpart.

                  IN WITNESS WHEREOF, the Borrower and the Lender have caused
this Agreement to be executed by their duly authorized officers as of the date
and year first above written.

BANK ONE, N.A.                                INTERNATIONAL TOTAL SERVICES, INC.

By:  /s/ T. Steven Blake                      By: /s/ Mark D. Thompson
Name: T. Steven Blake                         Name:  Mark D. Thompson
Title: First Vice President, Managed Assets   Title: Chief Executive Officer

                                       6
<PAGE>   7

                                   SCHEDULE 1
                                   ----------

                               List of Guarantors
                               ------------------

Domestic
--------

                  Crown Technical Systems, Inc. (Ohio)

                  T.I.S. Incorporated (Texas)

                  Certified Investigative Services, Inc. (Texas)

                  I.T.S. of New York, Inc. (New York)

                  Selective Detective Services, Inc. (New Jersey)

Foreign
-------

                  International Total Services, Ltd. (United Kingdom)

                  International Transport Security, s.r.o. (Czech Republic)

                  International Transport Services, Ltd. (Thailand)

                                       7
<PAGE>   8

                                   SCHEDULE 2
                                   ----------

                                 Guarantied Debt
                                 ---------------

                  Frankfurter Sparkasse     444,700 DM

                    Dated: 7/7/99

                                       8
<PAGE>   9

                                    EXHIBIT A

 Form of Third Amended and Restated Replacement Promissory Note (Revolving Loan)
 -------------------------------------------------------------------------------

                                 [SEE ATTACHED]

                                       9
<PAGE>   10

                           THIRD AMENDED AND RESTATED
                           REPLACEMENT PROMISSORY NOTE
                                (Revolving Loan)

$25,000,000                                                     Cleveland, Ohio
                                                                  April 1, 2000

                  FOR VALUE RECEIVED, INTERNATIONAL TOTAL SERVICES, INC., a
corporation organized under the laws of the State of Ohio (hereinafter referred
to as the "Company"), promises to pay to the order of BANK ONE, N.A., successor
by merger to BANK ONE, CLEVELAND, N.A. (hereinafter referred to as the "Bank"),
the principal amount of Twenty-Five Million Dollars ($25,000,000), or such
lesser amount as shall have from time to time been borrowed by the Company, on
April 1, 2001, or sooner as hereinafter provided, with interest on the unpaid
balance of said principal amount from the date hereof at the Contract Rate, as
defined in the Agreement hereinafter referred to, which definition is hereby
accepted by the Company, as the same may from time to time be established.

                  The Company agrees to pay interest on the unpaid principal
amount outstanding of this Note in monthly installments, commencing on the 1st
day of May, 2000 and continuing on the 1st day of each month thereafter. The
unpaid balance of the principal amount outstanding and all accrued interest
thereon shall be due and payable on April 1, 2001.

                  Payments of both principal of and interest on this Note shall
be made in lawful money of the United States of America, at 600 Superior Avenue,
Cleveland, Ohio 44114, or at such other place as the Bank or any subsequent
holder hereof shall have designated to the Company in writing. Interest payable
on this Note shall be computed on a three hundred sixty (360) day per year basis
counting the actual number of days elapsed.

                  This Note, in part, evidences, but does not extinguish or
satisfy, a pre-existing indebtedness of the Company to the Bank heretofore
evidenced by a $25,000,000 Second Amended and Restated Replacement Promissory
Note, a $30,000,000 Amended and Restated Replacement Promissory Note (Revolving
Loan) dated October 10, 1997 to the Bank, which note was issued in substitution
for that certain $10,500,000 Replacement Promissory Note (Revolving Loan) dated
March 31, 1997 to the Bank and is issued pursuant to and is entitled to the
benefits of a Third Amended and Restated Consolidated Replacement Credit
Facility and Security Agreement dated as of March 31, 1997, as amended by that
certain First Amendment to Third Amended and Restated Consolidated Replacement
Credit Facility and Security Agreement dated as of October 10, 1997, that
certain Second Amendment to Third Amended and Restated Consolidated Replacement
Credit Facility and Security Agreement dated as of December 16, 1998 and that
certain Third Amendment to Third Amended and Restated Consolidated Replacement
Credit Facility and Security Agreement dated September 1999, and a Fourth
Amendment to Third Amended and Restated Consolidated Replacement Credit Facility
and Security Agreement of even date herewith, each by and between the Company
and the Bank (collectively, the "Agreement"), to which Agreement reference is
hereby

<PAGE>   11

made for a statement of the rights and obligations of the Bank and the duties
and obligations of the Company in relation thereto; but neither this reference
to the Agreement nor any provisions thereof shall affect or impair the absolute
and unconditional obligation of the Company to pay the principal of or interest
on this Note when due.

                  The Company may prepay all or any portion of this Note at any
time or times and in any amount only as provided in the Agreement.

                  In case an Event of Default, as defined in the Agreement,
shall occur and be continuing beyond any applicable grace period, the principal
of this Note may be declared immediately due and payable at the option of the
Bank.

                  No delay on the part of any holder hereof in exercising any
power or rights hereunder shall operate as a waiver of any power or rights. Any
demand or notice hereunder to the Company may be made by delivering the same to
the address last known to the Bank, or by mailing the same to such address, with
the same effect as if delivered to the Company in person.

                  The Company hereby authorizes any attorney-at-law to appear in
any court of record in the State of Ohio, or in any other state or territory of
the United States, at any time or times after the above sum becomes due, and
waive the issuance and service of process and confess judgment against it, in
favor of any holder of this Note, for the amount then appearing due, together
with the costs of suit, and thereupon to release all errors and waive all rights
of appeal and stay of execution. The foregoing warrant of attorney shall survive
any judgment, it being understood that should any judgment be vacated for any
reason, the foregoing warrant of attorney nevertheless may thereafter be used
for obtaining an additional judgment or judgments.

                  "WARNING. BY SIGNING THIS PAPER YOU GIVE UP YOUR RIGHT TO
NOTICE AND COURT TRIAL. IF YOU DO NOT PAY ON TIME, A COURT JUDGMENT MAY BE TAKEN
AGAINST YOU WITHOUT YOUR PRIOR KNOWLEDGE AND THE POWERS OF A COURT CAN BE USED
TO COLLECT FROM YOU REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE CREDITOR
WHETHER FOR RETURNED GOODS, FAULTY GOODS, FAILURE ON HIS PART TO COMPLY WITH THE
AGREEMENT OR ANY OTHER CAUSE."

                  This Note is executed at Cleveland, Cuyahoga County, Ohio.

INTERNATIONAL TOTAL SERVICES, INC.

                                             By: /s/Mark D. Thompson
                                                 Its: Chief Executive Officer

<PAGE>   12

                                    EXHIBIT B

                      Acknowledgment, Consent and Agreement
                      -------------------------------------

                                 [SEE ATTACHED]

                                       12
<PAGE>   13

                      ACKNOWLEDGMENT, CONSENT AND AGREEMENT
                      -------------------------------------

                  The undersigned each hereby acknowledges receipt of a copy of
the Fourth Amendment to Third Amended and Restated Consolidated Replacement
Credit Facility and Security Agreement dated as of April 1, 2000, by and between
International Total Services, Inc. ("Borrower") and Bank One, N.A., successor by
merger to Bank One, Cleveland, N.A. ("Bank One") and by executing this
Acknowledgment, Consent and Agreement the undersigned each hereby agrees to
remain bound by the terms and conditions of its respective Amended and Restated
Replacement Guaranty Agreement, Guaranty Agreement, Amended and Restated
Replacement Guarantor Security Agreement and Guarantor Security Agreement, as
applicable, each dated as of August 11, 1995, executed and delivered to Bank One
in connection with the Second Amended and Restated Replacement Credit Agreement
dated as of August 11, 1995, as subsequently amended, and each other document
hereafter executed in connection herewith or therewith by the undersigned.

Dated: April 1, 2000                      CROWN TECHNICAL SYSTEMS, INC.

                                          By: /s/Mark D. Thompson
                                              Title: Chairman of the Board

                                          T.I.S. INCORPORATED
                                          By: /s/ Mark D. Thompson
                                              Title: Chief Executive Officer

                                       13
<PAGE>   14

                                    EXHIBIT C

                           Borrowing Base Certificate
                           --------------------------

                                 [SEE ATTACHED]

                                       14
<PAGE>   15

                           BORROWING BASE CERTIFICATE
                           --------------------------

At the close of business on 0/00/00                  Report # 479
------------------------------------
                                                     Date     0/00

<TABLE>
<CAPTION>
Collateral Status                                         Computation
-----------------                                        of Collateral
                                                         -------------

<S>                                                           <C>
1.  Balance (Domestic A/R)                                    $0
2.  Less: Ineligible Collateral (Domestic)                    $0
                                                              --
3.  Eligible Collateral                                       $0
4.  Advance % rate                                            85%

TOTAL AVAILABILITY                                             0%
------------------                                            ==

5.  Available - Not To Exceed $25,000,000                     $0
6.  Less Reserves (Letters to Credit) #                       $0
7.  NET AVAILABLE TO BORROW                                   $0
                                                              ==

LOAN STATUS
-----------

8.  Previous Loan Balance                                     $0
9.  Less: Collections                                         $0
10. Add: Request for Funds                                    $0
            Wire Transfers                                    $0
            Other (interest, fees, etc.)                      $0
                                                              --
11. New Loan Balance                                          $0
                                                              --

12. Excess Available (Line 7-11)                              $0
                                                              ==
</TABLE>

Borrower represents and warrants to Bank One, N.A. that all of the information
presented above and accompanying this Certificate is true, complete and correct
in every aspect as of the date hereof and has been computed in compliance with
the terms of the Fourth Amendment to Third Amended and Restated Consolidated
Replacement Credit Facility and Security Agreement dated 4/1/00, as amended,
between Bank One, N.A., and International Total Services, Inc. (the "Credit
Agreement"). In the event of any conflict between the terms of this Certificate
and the Credit Agreement, the terms of the Credit Agreement shall control.
Borrower further represents and warrants that as of the date hereof, after
giving effect to any loan or advance requested by Borrower contemporaneously
herewith, except as may have been otherwise expressly disclosed in writing by
Borrower to and received by Bank One N.A., that; (I) no Event of Default under
the terms of the Credit Facility, and no event which, but for a requirement of
giving notice or passage of time, or both, would constitute such an Event of
Default, has occurred or is continuing; (ii) each representation and warranty
contained in the Credit Agreement and related documents are true and correct;
(iii) there has been no material adverse change in Borrower's financial
position, operations or assets since the date of the latest financial statements
of Borrower delivered to Bank One, N.A.; (iv) to the extent that any loan or
advance requested contemporaneously herewith, or that is otherwise based upon
this certificate, will be used, in whole or in part, for the payment of wages,
Borrower has paid or deposited or is able to pay and intends to and shall make
timely payment or deposit of all taxes required to be deducted and withheld from
said wages; (v) all said wages incurred in the production of any inventory
included in this Certificate have been paid or will be timely paid. Borrower
acknowledges that Bank One is entitled to rely on this Certificate in making
loans and advances to Borrower.

<TABLE>
<CAPTION>
---------------------------------------- ------------------------------------- -------------------------------------

Borrower Name:                           Authorized Signature:                 Title:
International Total Services, Inc.                                             EVP
---------------------------------------- ------------------------------------- -------------------------------------
<S>                                      <C>                                   <C>
                                         Prepared By:                          Cash Mgmt. Dir.
                                         ------------------------------------- -------------------------------------
</TABLE>

#Includes the reserve for Delta G-Max accounts and the FAA Fine Accrual.

                                       15

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