72.  (1) Any police officer, or any other person authorized in writing by the Commissioner of Police for the purposes of this section, who has reasonable cause to suspect that any person is in possession of, or is removing, any narcotic drug or psychotropic substance in contravention of this Act may -

(a) stop and search that person and any conveyance in which he is and any package in his possession or under his control;

(b) seize and detain for the purposes of proceedings under this Act any narcotic drug or psychotropic substance or any other thing (including any conveyance) which appears to be evidence of the commission of an offence under this Act, found in the course of the search; and

(c) arrest and detain the person until he can be brought before a magistrate as soon as is reasonably practicable, and dealt with according to law.

(2) Any police officer, or any other person authorized in writing by the Commissioner of Police for the purposes of this section, who has reasonable cause to suspect that any motor vehicle, aircraft, ship, carriage or other conveyance was, or is being, made use of in the commission of any offence under this Act may stop and enter and search the motor vehicle, aircraft, ship, carriage or other conveyance and may for that purpose break open any door and remove any other impediment or obstruction to such entry.

(3) A police officer or authorized person referred to in subsection (1) or (2) may use such assistance and such force as may be reasonable for carrying out his functions under those subsections.