Oman acceded to the Single Convention on Narcotic Drugs of 1961 on 24 July 1987. The convention lists cannabis and cannabis resin among its controlled drugs and obliges its parties to limit their production, trade, possession and use to medical and scientific purposes.[1]
Listed for context. No score change is recorded for Oman here.
References
Checked. The date and the event were compared with a source that was read.