Convention for Limiting the Manufacture and Regulating the Distribution of Narcotic Drugs Signed 13 July 1931 Location Geneva Effective 9 July 1933 Condition Ratifications or accessions of twenty-five Members of the League of Nations or non-member States, including any four of the following: France, Germany, United Kingdom of Great Britain and Northern Ireland, Japan, Netherlands, Switzerland, Turkey, and the United States of America. Parties ?