EXHIBIT
      10.9

    


    


    LETTER
      AGREEMENT

     

    

       

      
        
           

        

        
           

          
            

          

        

        
           

        

      

      March
        29,
        2007

       

      


      VIA
        FACSIMILE

       

      The
        Pinnacle Fund, L.P.

      4965
        Preston Park Blvd.

      Suite
        240

      Plano,
        TX
        75093

      Attn:
        Barry
        M. Kitt

      William
        J. Collinsworth

      


      Pinnacle
        China Fund, L.P.

      4965
        Preston Park Blvd.

      Suite
        240

      Plano,
        TX
        75093

      Attn:
        Barry
        M. Kitt

      William
        J. Collinsworth

      


      Re:Waiver
        of Investor Lockup Right

       

      Gentlemen:

       

      We
        refer
        to the Securities Purchase Agreement (the “Securities
        Purchase Agreement”),
        dated
        January 16, 2007, by and among China Public Security Technology, Inc. (formerly,
        Irish Mag, Inc.) (the “Company”),
        Pinnacle China Fund, L.P. and The Pinnacle Fund, L.P. (together, the
“Investors”),
        pursuant to which the Company sold to the Investors 7,868,422 shares of the
        Company’s common stock for a purchase price of $14,950,001.80 or
        $1.90
        per share.
        Capitalized terms used, but not otherwise defined, herein have the meanings
        ascribed to such terms in the Securities Purchase Agreement.

       

      As
        you
        know, Mr. Jiang Huai Lin, the Company’s Chief Executive Officer and majority
        shareholder, desires to transfer 500,000 shares of his common stock to certain
        employees of the Company and others who have provided consulting or advisory
        services to the Company in the past, for a purchase price of $950,000 or
        $1.90
        per share (the “Transfer”).
        However, pursuant to the terms of the Lockup Agreement, dated January 31,
        2007,
        among the Company, Mr. Lin and Total Device Management Limited a company
        owned
        and controlled by Mr. Lin, delivered to the Investors in accordance with
        Section
        2.2(a)(5)
        of the
        Securities Purchase Agreement (the “Lockup
        Agreement”),
        Mr.
        Lin has agreed not to transfer or otherwise dispose of his shares for a one-year
        period (the “Lockup
        Provision”).
        

      
        
           

        

        
           

          
            

          

        

        
           

        

      


      


      


      Section
        6.4
        of the
        Securities Purchase Agreement allows the waiver of any provision of the
        Securities Purchase Agreement by written agreement of the Company and the
        investors holding a majority of the Shares and Section
        11
        of the
        Lockup Agreement allows the parties to amend or modify its terms in writing.
        Consequently, the Company hereby requests that the Investors waive the Lockup
        Provision with respect to the Transfer.

      


      


      [Signature
        Page Follows]


      


      
        
           

        

        
           

          
            

          

        

        
           

        

      

      We
        ask
        that you waive the Lockup Provision as it relates to the Transfer by executing
        in the blank provided for your signature below. We acknowledge, however,
        that by
        signing below you are not waiving the Lockup Provision as it relates to any
        other disposition of securities held directly or indirectly by Mr. Lin, other
        than the Transfer.

       

      Very
        truly yours,

       

      


      CHINA
        PUBLIC SECURITY TECHNOLOGY, INC.

       

      By:
        /s/
        Jiang Huai Lin___________

                                                 
        Jiang Huai Lin

                                          President
        and Chief
        Executive Officer

       

       

      Consented
        to and approved this 29th
        day of March,
        2007:

       

      


       

      PINNACLE
        CHINA FUND, L.P.

      


       

       

      By  
        /s/
        Barry M. Kitt

             
        Barry M. Kitt,

      Manager,
        Kitt China Management, L.L.C.,

      the
        Manager of Pinnacle China Management, L.L.C.,

      the
        General Partner of Pinnacle China Advisors, L.P.,

      the
        General Partner of Pinnacle China Fund, L.P.

       

      


       

      


       

      THE
        PINNACLE FUND, L.P.

      


       

       

      By  
        /s/
        Barry M. Kitt

             
        Barry M. Kitt,

      Sole
        Member, Pinnacle Fund 

      Management,
        L.L.C.,

      the
        General Partner of Pinnacle Advisors, L.P.,

      the
        General Partner of The Pinnacle Fund, L.P.