Drug prohibition law is prohibition-based law by which governments prohibit, except under licence, the production, supply, and possession of many, but not all, substances which are recognized as drugs, and which corresponds to international treaty commitments in the Single Convention on Narcotic Drugs 1961, the Convention on Psychotropic Substances 1971, and the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances 1988.