(1)  It shall be lawful for the Commissioner to issue to any police officer a general warrant, in the appropriate form set forth in Schedule II , authorizing such officer to search for stolen property.

(2)  Every such warrant shall be signed by the Commissioner personally, and shall remain in force, unless sooner revoked, for 6 months from the date thereof, or for such shorter period, if any, as may be specified therein, and shall authorize the officer therein named to exercise the powers therein set forth.

(3)  The Commissioner, at any time, may revoke any general warrant issued by him.