**Exhibit
      10.3**





MODIFICATION
      AGREEMENT








This
      Modification Agreement (“Agreement”) is entered into as of June 26, 2007,
      between IDO Security Inc., formerly known as “The Medical Exchange Inc.” (the
“Company”) and Double U Master Fund, LP (“Holder”). The Company issued to Holder
      a Secured Promissory Note on February 28, 2007, in the principal amount of
      $1,134,000 that is due June 28, 2007 (the “Note”). Capitalized terms not
      otherwise defined herein shall have the meanings ascribed to them in the
      relevant Holder’s Note.





The
      Company has requested that the Maturity Date of the Note be extended to August
      31, 2007. Holder is willing to amend the Note on the terms and conditions
      specified below.





NOW,
      THEREFORE, for good and valuable consideration receipt of which is hereby
      acknowledged, Holder and the Company do hereby agree, subject to the execution
      and delivery of this Agreement by Holders and the Company, as
      follows:





1. The
      Principal Amount of the Note is increased to $1,179,360.





2. The
      Maturity Date of the Note as defined by the Note and the Subscription
      Agreements, pursuant to which Note was issued, shall mean August 31,
      2007.





3. In
      further consideration of Holder’s execution and delivery of this Agreement, the
      Company agrees to issue to such Holder an additional warrant (“Additional
      Warrant”) for the purchase of up to 1,701,000  shares
      of
      the Company’s common stock. All other terms and conditions of the Additional
      Warrant, including without limitation, the per share exercise price and the
      exercise period, shall be identical to the Warrant issued to Holder on the
      Issue
      Date (except that the Issue Date of the Additional Warrant shall be the date
      hereof). The Additional Warrant reflects the forward stock split (by way of
      a
      dividend) that was effected in June 2007. As of the date hereof, the term
      Warrant (as used in the Subscription Agreement) shall be deemed to include
      the
      Additional Warrant.





4. The
      Company will also issue to the Holder 315,000 shares of the Company’s common
      stock. The additional shares reflects the forward stock split (by way of a
      dividend) that was effected in June 2007.





5. This
      Agreement may be executed in two or more counterparts, all of which when taken
      together shall be considered one and the same agreement and shall become
      effective when counterparts have been signed by each party and delivered to
      any
      other party, it being understood that all parties need not sign the same
      counterpart. In the event that any signature is delivered by facsimile
      transmission, such signature shall create a valid and binding obligation of
      the
      party executing (or on whose behalf such signature is executed) the same with
      the same force and effect as if such facsimile signature were an original
      thereof. A copy of this Agreement annexed to the Note shall be sufficient to
      reflect the amendment thereto.




6. Except
      as
      specified herein, all terms and conditions of the Notes and all other
      Transaction Documents (as defined in the Subscription Agreements), as heretofore
      amended, shall remain in full force and effect.







IN
      WITNESS WHEREOF, each of the parties has executed and delivered this Agreement
      as of the date first above written.






COMPANY
            
            HOLDERIDO SECURITY INC.
            
            DOUBLE U MASTER FUND, LP__________________________
            
            __________________________By:
            
            By:Its:
            
            Its:








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