International Treaties on Narcotic Drugs and Psychotropic Substances United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, 1988, Vienna, Austria.International Opium Convention of 1912.International Convention on the Restriction of the Traffic in Opium, Morphine and Cocaine, Geneva, February 19, 1925.Single Convention on Narcotic Drugs of 1961.Convention for the Suppression of Illicit Traffic in Harmful Drugs, Geneva, June 26, 1936.Agreement to Limit the Manufacture and Regulate the Distribution of Narcotic Drugs 1936.Convention on Psychotropic Substances of 1971.The Drug Conventions of the United Nations (UN).Protocol Amending the Agreements, Conventions and Protocols on Narcotic Drugs 1912.Protocol to Limit and Regulate Poppy Cultivation and Production 1953.Protocol that subjects certain Drugs not included in the Convention of July 13, 1931m to Limit the Manufacture and Regulate the Distribution of Narcotic Drugs, modified by the protocol signed in Lake Success, on December 11, 1946.