EXHIBIT 5

                   [Letterhead of Drinker Biddle & Reath LLP]


                                 August 26, 2004

Mace Security International, Inc.
1000 Crawford Place, Suite 400
Mt. Laurel, New Jersey  08054

      Re:   Registration Statement on Form S-3/A

Ladies and Gentlemen:

            We have acted as counsel to Mace Security International, Inc., a
Delaware corporation (the "Company"), in connection with the preparation and
filing of a registration statement on Form S-3/A (Registration No. 333-116527),
as amended (the "Registration Statement"), under the Securities Act of 1933, as
amended (the "Securities Act"), registering an aggregate of 1,098,000 shares of
the Company's Common Stock, par value $.01 per share, 915,000 of which currently
are issued and outstanding (the "Outstanding Shares") and 183,000 of which are
issuable upon the exercise of a warrant (the "Warrant Shares"), for resale by
the Selling Stockholders (as defined in the prospectus (the "Prospectus"))
included in the Registration Statement.

            For purposes of this opinion, we have examined originals or copies,
certified or otherwise identified to our satisfaction, of the Company's
Certificate of Incorporation and Bylaws, each as amended to date, resolutions
adopted by the Company's Board of Directors and the other agreements,
instruments, documents and records relating to the Company and the issuance of
the Outstanding Shares and the Warrant Shares as we have deemed appropriate. In
all such examinations, we have assumed the legal capacity of each natural person
signing any of the documents and corporate records relating to the Company, the
genuineness of signatures, the authenticity of documents submitted to us as
originals, the conformity to authentic original documents of documents submitted
to us as copies, and the accuracy and completeness of all records and other
information made available to us by the Company. As to various questions of fact
material to our opinion, we have relied on representations of officers of the
Company. We express no opinion concerning the laws of any jurisdiction other
than the General Corporation Law of the State of Delaware and the decisional law
thereunder.

            On the basis of the foregoing, we are of the opinion that the
Outstanding Shares have been validly issued and are fully paid and
non-assessable by the Company under the laws of the State of Delaware, and that
the Warrant Shares, upon exercise of the warrant and payment therefor in
accordance with the terms thereof, will be validly issued, fully paid and
non-assessable by the Company under the laws of the State of Delaware.

Mace Security International, Inc.
August 26, 2004
Page 2

            We hereby consent to the reference to our firm under the caption
"Legal Opinion" in the Prospectus and to the filing of this opinion as an
exhibit to the Registration Statement. In giving this consent, we do not admit
that we come within the categories of persons whose consent is required under
Section 7 of the Securities Act or under the rules and regulations of the
Securities and Exchange Commission issued thereunder.

                                        Very truly yours,


                                        /s/ Drinker Biddle & Reath LLP
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                                        DRINKER BIDDLE & REATH LLP


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