Canada became a party on 11 December 1946 to the Protocol of 11 December 1946, which transferred to the United Nations the League of Nations' functions under the earlier drug treaties. It thereby remained bound by the International Opium Convention signed at Geneva in 1925, the first treaty to put Indian hemp under international control.[1]
Listed for context. No score change is recorded for Canada here.
References
Checked. The date and the event were compared with a source that was read.