http://www.legislation.gov.uk/id/ukpga/1970/36

http://www.legislation.gov.uk/ukpga/1970/36/crossheading/defence-of-drug-taken-for-medical-purposes

Merchant Shipping Act 1970

An Act to make fresh provision in place of certain enactments relating to merchant ships and seamen and to repeal some of those enactments without replacement; to make further provision relating to merchant ships and seamen; and for purposes connected therewith.