Single Convention on Narcotic Drugs

The Single Convention on Narcotic Drugs, 1961 (also called the Single Convention, 1961 Convention, or C61) is an international treaty that controls activities (cultivation, production, supply, trade, transport) involving specific narcotic drugs and lays down a system of regulations (licenses, measures for treatment, research, etc.) for their medical and scientific uses, concluded under the auspices of the United Nations. The convention also establishes the International Narcotics Control Board.

Source: Wikipedia — Single Convention on Narcotic Drugs (CC BY-SA 4.0)