League of Nations Sign Multilateral Treaty Restricting Cannabis Use to Scientific and Medical Only

At the Second Opium Conference and the International Opium Convention, Egypt suggests 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 the import and export of cannabis are put into place.  (The Problem of Cannabis, n.d.)