**UNIT
        PURCHASE OPTION CLARIFICATION AGREEMENT**
 
  This
        Unit
        Purchase Option Clarification Agreement (this “Agreement”), dated August 10,
        2006, is to amend the Unit Purchase Option, dated as of January 30, 2006
        (the
“Option”), issued by Argyle Security Acquisition Corporation, a Delaware
        corporation, with offices at 200 Concord Plaza, Suite 700, San Antonio, Texas
        78216 (“Company”), to I-Bankers, Inc., a Texas corporation, with offices at 125
        E John Carpenter Freeway, Suite 260, Irving, Texas 75062 (“Option
        Holder”).
  **WHEREAS,** as
        a
        result of certain questions that have arisen regarding the accounting treatment
        applicable to the Option, the parties hereto deem it necessary and desirable
        to
        amend the Option to clarify that the Option Holder does not have the right
        to
        receive a net cash settlement in the event the Company does not maintain
        a
        current prospectus relating to the units, common stock and warrants issuable
        upon exercise of the Option at the time such Option is exercisable.
  **NOW,
        THEREFORE** ,
        in
        consideration of the mutual agreements contained herein and other good and
        valuable consideration, the receipt and sufficiency of which are hereby
        acknowledged, and intending to be legally bound hereby, the parties hereto
        agree
        to amend the Option as set forth herein.
  1.  Option .
        The
        undersigned hereby agree that the Option is hereby amended by adding the
        following as Section 2.1.1 to the Option:
 
 “2.1.1 No
        Exercise of Purchase Option if a Registration Statement is not
        Effective . Notwithstanding
        anything herein to the contrary, the Company shall not be obligated to deliver
        any securities pursuant to the exercise of this Purchase Option unless (i)
        a
        registration statement under the Act with respect to the Units, Warrants
        and
        Common Stock issuable upon such exercise is effective, or (ii) in the opinion
        of
        counsel to the Company or counsel to the Holder reasonably satisfactory to
        the
        Company, the exercise of this Purchase Option is exempt from the registration
        requirements of the Act and such securities are qualified for sale or exempt
        from qualification under applicable securities laws of the states or other
        jurisdictions in which the registered holders reside. This Purchase Option
        may
        not be exercised by, or securities issued to, any registered holder in any
        state
        in which such exercise or issuance would be unlawful. In
        no
        event will the Holder be entitled to receive a net-cash settlement or other
        consideration in lieu of physical settlement in securities if the securities
        underlying this Purchase Option is not covered by an effective registration
        statement.”
  2.  Miscellaneous .
  a.  Governing
        Law; Jurisdiction .
        The
        validity, interpretation, and performance of this Agreement shall be governed
        in
        all respects by the laws of the State of New York, without giving effect
        to
        conflict of laws. The Company hereby agrees that any action, proceeding or
        claim
        against it arising out of or relating in any way to this Agreement shall
        be
        brought and enforced in the courts of the State of New York or the United
        States
        District Court for the Southern District of New York, and irrevocably submits
        to
        such jurisdiction, which jurisdiction shall be exclusive. The Company hereby
        waives any objection to such exclusive jurisdiction and that such courts
        represent an inconvenient forum. Any such process or summons to be served
        upon
        the Company may be served by transmitting a copy thereof by registered or
        certified mail, return receipt requested, postage prepaid, addressed to it
        in
        care of the address set forth above or such other address as the undersigned
        shall furnish in writing to the other. Such mailing shall be deemed personal
        service and shall be legal and binding upon the Company in any action,
        proceeding or claim.
  
 b.  Binding
        Effect .
        This
        Agreement shall be binding upon and inure to the benefit of the parties hereto
        and to their respective heirs, legal representatives, successors and assigns.
  c.  Entire
        Agreement .
        This
        Agreement sets forth the entire agreement and understanding between the parties
        as to the subject matter thereof and merges and supersedes all prior
        discussions, agreements and understandings of any and every nature among
        them.
        Except as set forth in this Agreement, provisions of the original Option
        which
        are not inconsistent with this Agreement shall remain in full force and effect.
        This Agreement may be executed in counterparts.
  d.  Severability .
        This
        Agreement shall be deemed severable, and the invalidity or unenforceability
        of
        any term or provision hereof shall not affect the validity or enforceability
        of
        this Agreement or of any other term or provision hereof. Furthermore, in
        lieu of
        any such invalid or unenforceable term or provision, the parties hereto intend
        that there shall be added as a part of this Agreement a provision as similar
        in
        terms to such invalid or unenforceable provision as may be possible and be
        valid
        and enforceable
  
  
  IN
        WITNESS WHEREOF, the parties hereto have executed this Unit Purchase Option
        Clarification Agreement as of the date first written above.


ARGYLE
                  SECURITY ACQUISTION CORPORATIONBy:
              /s/ Ron
                ChaimovakiName:
              Ron
                ChaimovskiTitle:
              Co-CEO
                and Vice
                Chairman
  I-BANKERS,
                  INC.By:
              /s/ Shelley
                GluckName:
              Shelley
                GluckTitle:
              President