The Protocol Amending the Agreements, Conventions and Protocols on Narcotic Drugs concluded at The Hague on 23 January 1912, at Geneva on 11 February 1925 and 19 February 1925, and 13 July 1931, at Bangkok on 27 November 1931 and at Geneva on 26 June 1936 was a treaty, signed on 11 December 1946 at Lake Success, that shifted the drug control functions previously assigned to the League of Nations to the United Nations. As the Protocol's official title says, it modifies the provisions of the: