EXHIBIT 23






           CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We consent to the incorporation by reference in the Registration Statement of
Security Devices International Inc. on Form S-8 of our report dated February 17,
2006 relating to the financial statements of Security Devices International,
Inc. for the nine months ended November 30, 2005 (since inception).

                                        SCHWARTZ LEVITSKY FELDMAN LLP
                                        Chartered Accountants
Toronto, Ontario, Canada

December 12, 2006








                              CONSENT OF ATTORNEYS


      Reference is made to the Registration Statement of Security Devices
International Inc. on Form S-8 whereby the Company, as well as certain
shareholders of the Company, propose to sell up to 3,400,000 shares of the
Company's Common Stock. Reference is also made to Exhibit 5 included in the
Registration Statement relating to the validity of the securities proposed to be
issued and sold.

      We hereby consent to the use of our opinion concerning the validity of the
securities proposed to be issued and sold.


                                    Very Truly Yours,

                                    HART & TRINEN, L.L.P.



                                    By  /s/ William T. Hart
                                          William T. Hart


Denver, Colorado
December 14, 2006