<PAGE>
                                                                   EXHIBIT 10.75


                              CONSULTING AGREEMENT

         THIS CONSULTING AGREEMENT is made as of July 22, 2003 by and between
Invisa, Inc., a Nevada corporation with its principal place of business in
Sarasota, Florida (the "Corporation") and Patrick W. H. Garrard d/b/a The
Garrard Group of West Redding CT ("Consultant Company").

                                R E C I T A L S:

         WHEREAS, the Corporation is a publicly traded company; and

         WHEREAS, the Consultant Company is a firm providing investor, public,
trade and media relations services and marketing programs to public companies;
and

         WHEREAS, the Corporation and the Consultant Company have agreed to
enter into a consulting agreement for their mutual benefit pursuant to the terms
and conditions set forth hereinbelow ("Agreement").

         NOW, THEREFORE, in consideration of the mutual promises made herein,
and for other good and valuable consideration, receipt of which is hereby
acknowledged by each party, the parties, intending to be legally bound, hereby
agree as follows:

1.       DESCRIPTION OF SERVICES

         (1)      The Consultant Company represents and warrants to the
                  Corporation that the Consultant Company has the required
                  skills and experience to perform the duties and exercise the
                  responsibilities required of the Consultant Company as an
                  investor, public, trade and media relations consultant. In
                  carrying out these duties and responsibilities, the Consultant
                  shall comply with all lawful and reasonable instructions as
                  may from time to time be given by superiors representing the
                  Corporation.

         (2)      The Consultant Company agrees to act in an advisory and
                  consultative and action capacity for the Company in respect to
                  all of the items set forth in (a) through (n) below, and more
                  specifically agrees: (i) to develop and prepare (and/or to
                  supervise the development and preparation of) the items set
                  forth in (a), (b), (c), (d), (e), and (g) below; and (ii) to
                  perform the activities set forth in items (f), (h), (i), (j),
                  (k), (l), (m), (n) and (o) below:

                  (a)      The Corporation's Corporate Mission Statement;

                  (b)      The Corporation's 32-page "Corporate Bible";

                  (c)      The Corporation's website (including conceptualizing,
                           designing and programming);

                  (d)      The Corporation's corporate materials including, but
                           not limited to, a pocket folder and various color
                           inserts;

                  (e)      The Corporation's quarterly newsletter;

                  (f)      Establishment of a relationship with ADP shareholder
                           services and coordination with shareholder
                           communication efforts via ADP;
<PAGE>

                                       2


                  (g)      The Corporation's corporate advertising materials for
                           National Investor Awareness Initiatives including,
                           but not limited to, a 16 page advertising newsletter
                           feature, email campaign components, inserts and
                           space-ads;

                  (h)      Assisting in providing guidance in the preparation,
                           writing and dissemination of press releases, reports,
                           annual reports or other informational material to be
                           sent from time to time to shareholders and/or
                           prospectively interested parties;

                  (i)      Development and management of an ongoing nationwide
                           public relations campaign for the
                           consumer/trade/media.

                  (j)      Ensuring complete and regular review of the
                           Corporation Investor Relations Program for the
                           purpose of maintaining its timely relevance to the
                           Corporation's requirements;

                  (k)      Providing the Corporation with (at least) a monthly
                           summary of activities, in writing and verbally;

                  (l)      Posting the Corporation corporate information on a
                           website specifically developed for the Corporation;

                  (m)      Providing the Corporation with a monthly list of all
                           contact information for: (i) all individuals or
                           others contacting Consultant Company or its
                           subcontractors regarding the Corporation; and (ii)
                           all individuals sent information regarding the
                           Corporation in response to any inquiry;

                  (n)      Maintain a record of all the mailing and contact
                           lists the Consulting Company uses in the event the
                           Corporation is required, under law, to disclose the
                           recipients of the mailings.

                  (o)      To advise the Corporation with regard to the manner
                           of dissemination of creative materials.

         (3)      It is understood and agreed that the decision whether to make
                  or disseminate forecasts and/or financial projections and if
                  so, the preparation of such forecasts and/or financial
                  projections rests solely with the Corporation. The Consultant
                  Company shall obtain the Corporation's written approval for
                  content before distributing or otherwise disseminating any and
                  all information and material of whatever nature or kind
                  relating to the Corporation to any person or group whatsoever.

         (4)      The Consultant Company agrees to comply with and be bound by
                  the terms and conditions of this Agreement and cause its
                  agents, employees and contractors to be similarly bound.

         (5)      In consideration of the Consultant Company's agreement hereto
                  and the Consultant Company's performance in accordance
                  herewith, the Corporation retains the Consultant Company as
                  Investor, Public, Trade and Media Relations Consultant for a
                  term of 12 months commencing upon the resolution of the
                  conditions set forth in Section 17. of this Agreement (the
                  "Term of this Agreement"), subject to earlier termination as
                  provided in Section 7.(a) or (b).

<PAGE>
                                       3


         (6)      The Consultant Company acknowledges and agrees that the
                  effective performance of the Consultant Company's duties
                  requires the highest level of integrity and the Corporation's
                  complete confidence in the Consultant Company's employees. The
                  Consultant Company acknowledges that the officers responsible
                  for implementing the Corporation's investor relations program
                  and with whom the Consultant Company's employees will deal
                  with in regards to such program are to be designated by the
                  Corporation.

         (7)      It is understood and agreed to by the Consultant Company that
                  the Corporation reserves the right to modify the Consultant
                  Company's assignments, duties and reporting relationships
                  within the parameters of its responsibilities as an Investor,
                  Public, Trade and Media Relations Consultant.

2.       SERVICE

         During the Term of this Agreement the Consultant Company shall well and
faithfully serve the Corporation. The Corporation acknowledges that the
Consultant Company is engaged in the business of investor marketing and
ancillary functions on behalf of other companies, whether public or private.

3.       CONFIDENTIAL INFORMATION

         (1)      The Consultant Company acknowledges that as Investor, Public,
                  Trade and Media Relations Consultant, and in such other
                  position as it may from time to time be appointed to, or may
                  be deemed by law, the Consultant Company will acquire
                  information about certain matters and things which are
                  confidential to the Corporation, (the "Information") and which
                  Information is the exclusive property of the Corporation
                  including, but not limited to:

                  (a)      Lists of present and prospective customers, and
                           related information;

                  (b)      Pricing and sales policies, techniques and concepts;

                  (c)      List of suppliers and customers;

                  (d)      Trade secrets;

                  (e)      Financial information not provided to the public;

                  (f)      All non-public information; and

                  (g)      All information regarding the proprietary aspects of
                           the Corporation's technology and/or products.

         (2)      The Consultant Company acknowledges such Information as
                  referred to in Section 3(1) above could be used to the
                  detriment of the Corporation. Accordingly, the Consultant
                  Company undertakes to treat confidentially all such
                  Information, except if same is already or becomes information
                  generally known to the public, and agrees not to disclose same
                  to any third party either during or after the Term of this
                  Agreement, except as may be necessary in the proper discharge
                  of its services, however caused, except with the written
                  permission of an officer of the Corporation.

<PAGE>
                                       4


         (3)      The Consultant Company acknowledges that, without prejudice to
                  any and all rights of the Corporation, an injunction is the
                  only effective remedy to protect the Corporation's rights and
                  property as set out in Sections 3.(1) and 3.(2) hereinabove.

4.       REPRESENTATIONS AND WARRANTIES

         The Consultant Company represents and warrants to the Corporation that:

         (a)      It will exercise reasonable care to assure that all materials
                  and documents descriptive of or relating to the Corporation
                  which are prepared by the Consulting Company or its
                  subcontractors (the "Creative Materials") be accurate, not
                  misleading and balanced in presentation;

         (b)      It will exercise reasonable care to assure that all Creative
                  Materials submitted to the Corporation for approval are: (i)
                  compliant with the requirements of federal securities laws for
                  such material; (ii) in the long term best interests of the
                  Corporation and its shareholders; and (iii) consistent with
                  good practices for shareholder relations for a development
                  stage public company;

         (c)      The entities engaged to perform website and PR services
                  hereunder will be supervised by the Consultant Company and
                  that the Expenses/Program Costs referenced in Section 6. and
                  listed in Exhibit B represent maximum anticipated costs for
                  such services; and

         (d)      To provide the Corporation its best advice regarding the
                  manner of preparation and designing of Creative Materials to
                  enhance long-term shareholder liquidity and value without
                  spikes.

5.       NON-COMPETITION

         The Consultant Company agrees that, during the Term of this Agreement
and for a period of twenty-four (24) months following termination of this
Agreement, however caused, it will not hire or take away or cause to be hired or
taken away any employee of the Corporation or, following termination of this
Agreement, any employee who was in the employ of the Corporation during the six
(6) months preceding termination.

6.       REMUNERATION AND BENEFITS

         In consideration of the Consultant Company's undertaking and the
performance of the obligations contained herein, the Corporation shall pay cash
compensation as outlined in Exhibit A hereto. In addition, the Corporation shall
provide for expenses and costs associated with the Consultant Company's
activities, payments to sub-contractors and production of materials. These
expenses/program costs are outlined in chart format as Exhibit B hereto and
require an advance deposit as outlined in Exhibit B.

<PAGE>
                                       5


7.       TERMINATION

         The parties understand and agree that this Agreement may be terminated
in the following manner in the specified circumstances:

         (a)      By the Consultant Company for any reason, on the giving of not
                  less than thirty (30) days notice to the Corporation.
                  Consultant Company acknowledges and agrees that Consultant
                  Company shall not be entitled to any additional monthly cash
                  compensation following the expiration of the 30-day notice
                  period;

         (b)      By the Corporation for any reason, on the giving of not less
                  than thirty (30) days notice to the Consultant Company.
                  Consultant Company acknowledges and agrees that Consultant
                  Company shall not be entitled to any additional monthly cash
                  compensation following the expiration of the 30-day notice
                  period;

         (c)      By the Corporation, at its option, without notice, for cause
                  including:

                  i.       Any material breach of the provisions of this
                           Agreement;

                  ii.      Conviction of the Consultant Company of a criminal
                           offense;

                  iii.     Any mental or physical disability or illness which
                           results in the Consultant Company being unable to
                           substantially perform his duties in accordance with
                           this Agreement for a period of thirty (30) days in
                           any one hundred and twenty (120) day period. Failure
                           by the Corporation to rely on this provision in any
                           given instance or instances, shall not constitute a
                           precedent or be deemed a waiver; or

         (d)      By the Consultant Company for cause, including any material
                  breach of this Agreement by the Corporation.

         (e)      In the event of termination by either party, Consultant
                  Company shall exercise its best efforts to provide Corporation
                  with a smooth transition in all functions covered by this
                  agreement and to deliver to Corporation all information and
                  investor inquiries received by it subsequent to termination.

<PAGE>
                                       6


8.       THE CORPORATION'S PROPERTY

         The Consultant Company acknowledges that all items of any and every
nature or kind created or used by the Consultant Company or its subcontractors
including, but not limited to, website codes and development, PR materials and
pending contacts or proposals, and fulfillment, pursuant to the Consultant
Company's services under this Agreement, or furnished by the Corporation to the
Consultant Company, and including, without limitation all equipment,
automobiles, credit cards, books, records, reports, files, manuals, literature,
all items developed or referred to in Section 1.(2)(3) herein, confidential
information or other materials shall remain and be considered the exclusive
property of the Corporation at all times and shall be surrendered to the
Corporation, in good condition, promptly on the termination of the Consultant
Company's services irrespective of the time, manner or cause of the termination.

9.       ASSIGNMENT OF RIGHTS

         The rights, which accrue to the Corporation under this Agreement, shall
pass to its successors or assigns. The rights of the Consultant Company under
this Agreement are not assignable or transferable in any manner unless assigned
to a company controlled by the same individuals as the Consultant Company.

10.      NOTICES

         (1)      Any notice required or permitted to be given to the Consultant
                  Company shall be sufficiently given if delivered to the
                  Consultant Company or if mailed by registered mail to the
                  Consultant Company or if mailed by registered mail to the
                  Consultant Company's address last known to the Corporation.

         (2)      Any notice required or permitted to be given to the
                  Corporation shall be sufficiently given if mailed by
                  registered mail to the Corporation's Head Office at its
                  address last known to the Consultant Company.

11.      SEVERABILITY

         In the event that a court of competent jurisdiction shall deem any
provision or part of this Agreement void or invalid, the remaining provisions or
parts shall be and remain in full force and effect.

12.      ENTIRE AGREEMENT

         This Agreement constitutes the entire Agreement between the parties
hereto with respect to the engagement of the Consultant Company and any and all
previous agreements, written or oral, express or implied between the parties
hereto ("Prior Agreements") are hereby null and void, and the parties hereto
hereby release and forever discharge the other of and from all manner of
actions, causes of action, claims and demands whatsoever, under or in respect of
any such Prior Agreements.

<PAGE>
                                       7



13.      MODIFICATION OF AGREEMENT

         Any modification of this Agreement must be in writing and signed by the
parties or it shall have no effect and shall be void.

14.      HEADINGS

         The headings used in this Agreement are for convenience only and are
not to be construed in any way as additions to or limitations of the covenants
and agreements contained in it.

15.      GOVERNING LAW

         This Agreement shall be construed in accordance with the laws of the
State of Connecticut.

16.      COUNTERPART

         This Agreement can be signed in counterpart.

17.      CORPORATION'S BOARD OF DIRECTOR APPROVAL

         This Agreement is subject to approval by the Corporation's Board of
Directors of: (a) this Agreement; and (b) funding.

18.      COSTS

         In the event of a dispute arising under the terms and conditions of
this consulting agreement, the prevailing party in any such dispute shall be
entitled to reasonable legal fees and cost of collection.

         IN WITNESS WHEREOF, this Agreement has been executed by the parties to
it, as of the day, month and year first written above.


Invisa, Inc.                                  Patrick W. H. Garrard d/b/a
                                              The Garrard Group



Per: /s/ Stephen A. Michael, President        Per:  /s/ Patrick W.H. Garrard
     ---------------------------------             ----------------------------
Authorized Signatory                               Authorized Signatory


<PAGE>




                                    EXHIBIT A

CASH COMPENSATION

         Cash Compensation pursuant to Section 6. of this Agreement

         -        Monthly fee of $12,500

         -        First two months fee deliverable upon resolution of the
                  conditions set forth in Section 17. then, a payment of $12,500
                  every thirty (30) days thereafter over a period of ten (10)
                  consecutive months (subject to the 30 day written notice of
                  cancellation pursuant to Section 7.(a) or (b).

         -        The first two months' fee of $25,000 has been paid.


<PAGE>





                                    EXHIBIT B

EXPENSES/PROGRAM COSTS PURSUANT TO SECTION 6. OF THIS AGREEMENT

         The following table provides an estimation of various costs and
expenses associated with the Consultant Company's duties and provisions of
services as described in this Agreement.

         A $25,000 deposit against these anticipated costs and expenses shall be
paid upon the resolution of the conditions set forth in Section 17. of this
Agreement.

<TABLE>
<S>                              <C>                <C>          <C>
-------------------------------- ------------------ ------------ --------------
            INVISA                 1-4 MONTHS(1)     5-8 MONTHS  9-12 MONTHS
-------------------------------- ------------------ ------------ --------------
 Website pursuant to 1.(2)(c)     $12,500-25,000       $5,000       $5,000
-------------------------------- ------------------ ------------ --------------
Newsletter pursuant to 1.(2)(e)       $2,000           $2,000       $2,000
-------------------------------- ------------------ ------------ --------------
    PR pursuant to 1.(2)(i)           $8,000           $8,000       $8,000
-------------------------------- ------------------ ------------ --------------
      Self-mailer Design              $8,000             $0           $0
-------------------------------- ------------------ ------------ --------------
         Misc. Design                 $6,000           $6,000       $6,000
-------------------------------- ------------------ ------------ --------------
           Writing*                   $11,000          $5,000       $5,000
-------------------------------- ------------------ ------------ --------------
        Misc. Expenses                $3,000           $2,000       $2,000
-------------------------------- ------------------ ------------ --------------
             TOTAL               $50,500-$63,000+/-    $28,000     $28,000
-------------------------------- ------------------ ------------ --------------
</TABLE>

*   Writing includes ingredients for Corporation's main story, investor folder,
brochures, press releases, web site, research (i.e.- the items in 1.(2) of this
Agreement.

(1)  $25,000 of the 1 - 4 months' cost and expenses has been paid.