6.—(1) Notwithstanding the provisions of section 4(1)(b) of the Act, any person who is lawfully in possession of a controlled drug may supply that drug to the person from whom he obtained it.
(2) Notwithstanding the provisions of section 4(1)(b) of the Act, any person who has in his possession a drug specified in Schedule 2, 3, 4 or 5 which has been supplied by or on the prescription of a practitioner for the treatment of that person, or of a person whom he represents, may supply that drug to any doctor, dentist or pharmacist for the purpose of destruction.
(3) Notwithstanding the provisions of section 4(1)(b) of the Act, any person who is lawfully in possession of a drug specified in Schedule 2, 3, 4 or 5 which has been supplied by or on the prescription of a veterinary practitioner or veterinary surgeon for the treatment of animals may supply that drug to any veterinary practitioner, veterinary surgeon or pharmacist for the purpose of destruction.
(4) It shall not by virtue of section 4(1)(b) or 5(1) of the Act be unlawful for any person in respect of whom a licence has been granted and is in force under section 16(1) of the Wildlife and Countryside Act 1981(1) to supply, offer to supply or have in his possession any drug specified in Schedule 2 or 3 for the purposes for which that licence was granted.
(5) Notwithstanding the provisions of section 4(1)(b) of the Act, any of the persons specified in paragraph (7) may supply any controlled drug to any person who may lawfully have that drug in his possession.
(6) Notwithstanding the provisions of section 5(1) of the Act, any of the persons so specified may have any controlled drug in his possession.
(7) The persons referred to in paragraphs (5) and (6) are
(a)a constable when acting in the course of his duty as such;
(b)a person engaged in the business of a carrier when acting in the course of that business;
(c)a person engaged in the business of the Post Office when acting in the course of that business;
(d)an officer of customs and excise when acting in the course of his duty as such;
(e)a person engaged in the work of any laboratory to which the drug has been sent for forensic examination when acting in the course of his duty as a person so engaged;
(f)a person engaged in conveying the drug to a person who may lawfully have that drug in his possession.