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.