EXHIBIT 5.1



                             Jennifer A. Post, Esq.
                         Law Office of Jennifer A. Post
                        340 North Camden Drive, Suite 302
                         Beverly Hills, California 90210


                                November 6, 2009


Universal Detection Technology
340 North Camden Drive, Suite 302
Beverly Hills, California 90210


      Re:   2009 EQUITY INCENTIVE PLAN III

Ladies and Gentlemen:

      We have acted as counsel to Universal Detection Technology, a California
corporation (the "Company"), in connection with the preparation of the filing
with the Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Securities Act"), of the Company's Registration Statement on Form
S-8 relating to 200,000,000 shares of the Company's common stock (the "Shares")
which may be issued pursuant to the Universal Detection Technology 2009 Equity
Incentive Plan III (the "Plan"). This opinion letter is being furnished to the
Company in accordance with the requirements of Item 601(b)(5) of Regulation S-K
of the Securities Act, and no opinion is expressed herein as to any matter,
other than as to the validity of the Shares.

      In connection with that registration, we have reviewed the proceedings of
the Board of Directors of the Company relating to the registration and proposed
issuance of the Shares, the Articles of Incorporation of the Company and all
amendments thereto, the Bylaws of the Company and all amendments thereto, and
such other documents and matters as we have deemed necessary to the rendering of
the following opinion.

      As to the facts on which this opinion is based, we have relied upon
certificates of public officials and certificates and written statements of
officers and representatives of the Company.

      In our examination, we have assumed the genuineness of all signatures, the
authenticity of all documents submitted to us as original documents, the
conformity to original documents of all documents submitted to us as copies and
the legal capacity of natural persons.






      The opinion expressed herein is limited to the General
Corporation Law of the State of California, including the applicable provisions
of the California Constitution and the reported judicial decisions interpreting
such law, in each case as currently in effect, and we express no opinion as to
the effect of the laws of any other jurisdiction. In addition, we have assumed
that the resolutions authorizing the Company to issue or deliver and sell the
Shares pursuant to the Plan and the applicable award agreements will be in full
force and effect at all times at which such Shares are issued or delivered or
sold by the Company, and the Company will take no action inconsistent with such
resolutions.

      In rendering the opinion below, we have assumed that each award under the
Plan will be approved by the Board of Directors of the Company or an authorized
committee of the Board of Directors.

      Based upon that review, it is our opinion that the Shares, when issued,
will be legally issued, fully paid, and nonassessable. We do not find it
necessary for the purposes of this opinion to cover, and accordingly we express
no opinion as to the application of, the securities or blue sky laws of the
various states of the United States to the issuance and sale of the Shares.

      We assume no obligation to advise you of any changes in the foregoing
subsequent to the date hereof.

      We consent to the use of this opinion in the registration statement filed
with the Securities and Exchange Commission in connection with the registration
of the Shares. In giving such consent, we do not thereby admit that we are
included in the category of persons whose consent is required under Section 7 of
the Securities Act or the rules and regulations of the Securities and Exchange
Commission promulgated thereunder.




                                            /S/ LAW OFFICE OF JENNIFER A. POST
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