Document:

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                                                                   EXHIBIT 10.52

                                  INVISA INC.
                              2002 INCENTIVE PLAN
                      NONQUALIFIED STOCK OPTION AGREEMENT

Option Agreement Number:                     N-004
Date of Grant/Award:                         June 27, 2002
Name of Optionee:                            John E. Scates
Optionee's Social Security Number:
Initial Vesting Date:                        September 30, 2002
Initial Exercise Date:                       September 30, 2002
Expiration Date:                             June 26, 2009 (the "Option Term")

         1.       Dated as of the above-stated Date of Grant/Award (the "Grant
Date") a Stock Option (the "Option") is hereby granted to the above-named
Optionee pursuant to the SmartGate Inc. (n/k/a Invisa, Inc.) 2002 Incentive
Plan (the "Plan"). The Award of this Option conveys to the Participant the
right to purchase from Invisa, Inc. (the "Company") up to Twenty Thousand
(20,000) shares of Stock (the "Option Shares") under the Plan at an exercise
price of $5.15 per share. The Option awarded hereunder is intended to be a
nonqualified stock option subject upon its exercise to treatment, for tax
purposes, under Section 83 of the Internal Revenue Code, and is specifically
not intended to be treated as an Incentive Stock Option, as such term is
defined under Section 422 of the Internal Revenue Code.

         2.       Except as specifically provided herein, the rights of the
Optionee, or of any other person entitled to exercise the Option, are governed
by the terms and provisions of the Plan. The Option is granted pursuant to the
terms of the Plan, which is incorporated herein by reference, and the Option
shall in all respects be interpreted in accordance with the Plan. The Company
shall interpret and construe the Plan and this Option Agreement with respect to
any issue arising thereunder or hereunder, and such interpretations and
determinations by the Company shall be conclusive and will bind the parties
hereto and any other person claiming an interest hereunder.

         3.       To the extent not previously exercised, the Option and all
rights with respect thereto, shall terminate and become null and void when the
Option Term expires.

         4.       Following any termination of Service with respect to the
Optionee, the Option shall be exercisable only during the following timeframes:

                  (a)      DISABILITY. If the Optionee's Service terminates
because of the Optionee becomes disabled, the Option, to the extent unexercised
and exercisable on the date on which Service thus terminated, may be exercised
at any time during the twelve (12) month period immediately following the date;
on which the Optionee's Service thus terminated, but in no event any later than
the date the Option Term expires.

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                  (b)      DEATH. If Service terminates because the Optionee
dies, the Option, to the extent unexercised and exercisable on the date on
which the Optionee's Service thus terminated, may be exercised at any time
during the twelve (12) month period immediately following the date on which the
Optionee's Service thus terminated, but in no event any later than the date the
Option Term expires. The Optionee's Service shall be deemed to have terminated
on account of the Optionee's death if the Optionee dies within three (3) months
of the Optionee's termination of Service for any other reason.

                  (c)      OTHER TERMINATION OF SERVICE. If the Optionee's
Service terminates for reasons other than those specifically enumerated, to the
extent the Option remains unexercised and exercisable by the Optionee on the
date on which the Optionee's Service thus terminated, the Option may be
exercised at any time during the three (3) month period immediately following
the date on which the Optionee's Service thus terminated, but in no event any
later than the date the Option Term expires.

         5.       Following the Initial Exercise Date, but subject to such
further limitations provided for herein as may apply, the Option shall become
exercisable as to all or any part of the Option Shares ("Vested Shares")
awarded in accordance with the following Vested Ratio schedule:

<TABLE>
<CAPTION>
            Number of Shares of Stock                 Vesting Date
            -------------------------                 ------------
            <S>                                    <C>
                      2,500                        September 30, 2002
                      5,000                         December 31, 2002
                      7,500                          March 31, 2003
                     10,000                           June 30, 2003
                     12,500                        September 30, 2003
                     15,000                         December 31, 2003
                     17,500                          March 31, 2004
                     20,000                           June 30, 2004
</TABLE>

         There shall be no proportionate or partial vesting in the periods
prior to each Vesting Date, and all vesting shall occur only on the appropriate
Vesting Date, except that in the event of a Change in Control, this Option
shall be deemed fully vested.

         6.       The Option may be exercised with respect to all or any part
of the number of Vested Shares by the giving of written notice ("Notice") of
the Optionee's intent to exercise to the Company at least five days prior to
the date on which exercise is to occur. The Notice shall specify the exercise
date and the number of Option Shares as to which the Option is to be exercised.
Full payment of the Option exercise price by any of the means of consideration
provided for under the Plan shall be made on or before the exercise date
specified in the Notice. Such full payment having occurred on or before the
exercise date specified in the Notice, or as soon thereafter as is practicable,
the

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Company shall cause to be delivered to the Optionee a certificate or
certificates for the Option Shares then being purchased. If the Optionee fails
to pay for any of the Option Shares specified in the Notice, or fails to accept
delivery of Option Shares, the Optionee's right to purchase such Option Shares
may be terminated by the Company.

         7.       During the Optionee's lifetime, the Option granted hereunder
shall be exercisable only by the Optionee or by any guardian or legal
representative of the Optionee, and the Option shall not be transferable
except, in the case of the death of the Optionee, by will or by the laws of
descent and distribution, nor shall the Option be subject to attachment,
execution or other similar process.

         8.       The Company may unilaterally amend the Option Award at any
time if the Company determines, in its sole discretion, that amendment is
necessary or advisable in light of any applicable addition to or change in the
Internal Revenue Code, any regulations issued thereunder, or any federal or
state securities law or other applicable law or regulation.

         9.       Until the date a Stock certificate is issued to an Optionee,
an Optionee shall have no rights as a stockholder with respect to the shares
of Stock subject to Award under this ISO Agreement, and no adjustments shall be
made for dividends of any kind or nature, distributions, or other rights for
which the record date is prior to the date such Stock certificate is issued.

         10.      The Optionee acknowledges having received and read a copy of
the Plan and this Agreement and agrees to comply with all laws, rules and
regulations applicable to the Award and to the sale or other disposition of the
Stock of the Company received.

         11.      In the event the Optionee should cease to be employed by or
to provide Services to the Company, the Company hereby reserves a right to
repurchase from Optionee, at its sole discretion, any or all shares issued to
Optionee under the Plan which have been outstanding in excess of six months.
Company is to pay to Optionee under such repurchase the Fair Market Value of
the shares on the date of such repurchase and Optionee will, from that point
onward, have no further shareholder rights with respect to those shares. The
Company hereby reserves a right of first refusal on all the awarded shares
which have been outstanding in excess of six months. During this time, prior to
selling any shares, the Optionee must notify the Company, in writing, of the
terms of the transaction in which the Optionee proposes to sell the shares.
Such notice shall be supported by a bona fide formal letter of arrangement.

         The bona fide formal letter of arrangement must include (i) all of the
terms of the transaction, (ii) a description of any financing arrangements
related to the transaction, and (iii) full disclosure of all parties, whether
agent or principal, who are interested in the transaction.

         The Company shall have sixty (60) days to determine if it or other
stockholders in the Company will purchase the shares. The Company shall respond
by the sixtieth (60th) day after receipt of the Optionee's notice or forfeit
its rights under this paragraph. If the Company decides that neither it nor any
other stockholders in the Company shall purchase the shares, the Optionee must
engage in the transaction as described in the

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notice provided to the Company within sixty (60) days; otherwise, the
Company's first refusal right shall again be applicable to any subsequently
proposed sale of the shares.

         12.      Any notice to the Company provided for in this Agreement
shall be addressed to it in care of its Secretary at its executive offices
located at 4400 Independence Court, Sarasota, Florida 34234, and any notice to
the Optionee shall be addressed to the Optionee at the address currently shown
on the payroll records of the Company. Any notice shall be deemed duly given if
and when properly addressed and posted by registered or certified mail, postage
prepaid.

         IN WITNESS WHEREOF, Invisa, Inc. has caused its duly authorized
officers to execute this nonqualified Stock Option Agreement, and the Optionee
has placed his or her signature hereon, effective as of the Grant Date.

INVISA, INC.

Attest:

By: /s/ Stephen A. Michael
   ----------------------------
Title:  President

ACCEPTED AND AGREED TO:

By: /s/ John E. Scates
   ----------------------------
   John E. Scates, Optionee<PAGE>
                                                                   EXHIBIT 10.53

         "THE WARRANTS AND THE SHARES THAT MAY BE PURCHASED UPON THE EXERCISE
OF THE WARRANTS COLLECTIVELY REFERRED TO AS THE ("SHARES") REPRESENTED BY THIS
CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED ("ACT"). SUCH SHARES HAVE BEEN ACQUIRED FOR INVESTMENT AND MAY NOT BE
PUBLICLY OFFERED OR SOLD IN THE ABSENCE OF (1) AN EFFECTIVE REGISTRATION
STATEMENT FOR SUCH SHARES UNDER THE ACT; (2) OPINIONS OF COUNSEL TO INVISA,
INC., PRIOR TO ANY PROPOSED TRANSFER TO THE EFFECT THAT REGISTRATION IS NOT
REQUIRED UNDER THE ACT; OR (3) A LETTER PRESENTED TO INVISA INC., PRIOR TO
ANY PROPOSED TRANSFER, FROM THE STAFF OF THE SECURITIES AND EXCHANGE
COMMISSION, TO THE EFFECT THAT IT WILL NOT TAKE ANY ENFORCEMENT ACTION IF THE
PROPOSED TRANSFER IS MADE WITHOUT REGISTRATION UNDER THE ACT."

Void after August 15, 2004

WARRANT CERTIFICATE FOR PURCHASE OF COMMON STOCK

NUMBER                                                          NO. OF WARRANTS
WA 1                           INVISA, INC.                          67,000
   -                                                                 ------

         This certifies that FOR VALUE RECEIVED DELBRUECK BANK or registered
assigns (the "Registered Holder") is the owner of SIXTY SEVEN THOUSAND Warrants
(the "Warrants"). Each Warrant represented hereby entitles the Registered
Holder to purchase, subject to the terms and conditions set forth in this
Warrant Certificate, one fully paid and non-assessable share of Common Stock,
$0.001 value ("Common Stock"), of Invisa, Inc., a Nevada corporation (the
"Company"), from the date hereof until August 15, 2004, (the "Expiration
Date"), upon the presentation and surrender of this Warrant Certificate
together with the full payment of the Exercise Price in effect on the date on
which written notice of exercise is delivered to the Company as provided
herein. Payment of the Exercise Price must be in the form of lawful money of
the United States delivered by certified, bankers check or other form
acceptable to the Company and delivered to the corporate office of the Company
at 4400 Independence Court, Sarasota, Florida 34234. The exercise price of each
Warrant (the "Exercise Price") is: (i) $5.00 per share until August 15, 2003
(the "Initial Warrant Year") And (ii) From August 16, 2003 to August 15, 2004
(the "Second Warrant Year") the greater of: (i) the average closing trading
price for the Company's common stock during the Initial Warrant Year, or (ii)
$8.00 per share.

The Warrants are redeemable at the option of the Company at $0.10 per warrant
upon 30 days notice to the Registered Holder. In order for the Company to
exercise its right to redeem: during the Initial Warrant Year the Company's
common stock must have traded for 20 consecutive trading days at a closing
trading price above $10.00 per share, or during the Second Warrant Year the
Company's common stock must have traded for 20 consecutive trading days at a
closing trading price above $16.00 per share.

Any Warrants not timely exercised or redeemed automatically expire on August
15, 2004 ("Expiration Date").

The grant of this Warrant is made without registration under the Securities Act
of 1933 as amended (the "Act") by reason of a specific exemption. The Warrants
and Shares to be issued at exercise shall be restricted as to transfer in
accordance with Regulation S and/or Rule 144 of the

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Act, whichever shall be applicable and Shares acquired upon the exercise of the
Warrants will bear a restrictive legend as to transfer in accordance with the
Act.

In the event of a stock dividend or stock split resulting in the number of
outstanding of shares of the Company being changed, the applicable exercise
price, number of shares, redemption price and trading price requirements for
redemption, as provided in the Warrants, shall be proportionately adjusted. In
the event of the merger, consolidation, or combination of the Company into
another company or entity which survives that transaction, the shares which may
be purchased under the Warrants shall be converted into an equivalent number of
shares of the surviving entity. In the event of the sale of all or
substantially all of the assets of the Company, the shares which may be
purchased upon the exercise of the Warrants shall be treated in any
distribution as if said shares are issued and outstanding, with the exception
that the exercise price under the Warrants shall be deducted from the amount to
be distributed on a per-share basis. The Registered Holders of Warrants shall
not be entitled to vote or exercise other rights of stockholders unless and
until the Warrants are exercised and the underlying Shares issued. In the event
of redemption by the Company, each Registered Holder shall be provided 30 days
prior written notice of the Company's intent to redeem, during which notice
period the Registered Holder of the Warrant shall be entitled to exercise the
Warrant.

         In the case of the exercise of less than all the Warrants represented
hereby, the Company shall cancel this Warrant Certificate upon the surrender
hereof and shall execute and deliver a new Warrant Certificate or Warrant
Certificates of like tenor for the balance of such Warrants.

         Prior to due presentment for registration of transfer hereof, the
Company may deem and treat the Registered Holder as the absolute owner hereof
and of each Warrant represented hereby (notwithstanding any notations of
ownership or writing hereon made by anyone other than a duly authorized officer
of the Company) for all purposes and shall not be affected by any notice to the
contrary.

         This Warrant Certificate shall be governed by and construed in
accordance with the laws of the State of Florida.

         This Warrant Certificate and the Registered Holder's rights hereunder
are not assignable or transferable by the Registered Holder except in
accordance with the Act and with the written consent of the Company which will
not be unreasonably withheld.

         IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed by two of its officers thereunto duly authorized.

/s/ William W. Dolan                         /s/ Stephen A. Michael, President
-------------------------------              ----------------------------------
William W. Dolan, Secretary                  Stephen A. Michael, President

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