1925 - LEAGUE OF NATIONS SIGN MULTILATERAL TREATY RESTRICTING CANNABIS USE TO SCIENTIFIC AND MEDICA
At the Second Opium Conference and the International Opium Convention, sponsored by the League of Nations and signed in Geneva on Feb. 19, 1925, Egypt proposes that hashish (cannabis resin) be added to the list of narcotics covered by the convention.
The convention authorizes the use of “Indian hemp” (cannabis) only for scientific and medical purposes. Restrictions on importing and exporting cannabis resin are put into place.
This convention is the first multilateral treaty that deals with cannabis.
United Nations Office on Drugs and Crime (UNODC) “The Cannabis Problem: A Note on the Problem and the History of International Action,” UNODC website, Jan. 1, 1962