A Revolutionary Party proclamation of 9 December 1958 banned the sale and smoking of opium, and the government shut the opium dens on 1 July 1959. The state opium monopoly closed with them. Cannabis was already illegal under the 1935 Cannabis Act, so this was not a cannabis law; it built the national narcotics enforcement system that later policed cannabis.[1][2][3]
Listed for context. No score change is recorded for Thailand here.
References
- Foreign Relations of the United States, 1958–1960, Vol. XV — Letter from Ambassador Johnson to Eric Kocher (29 June 1959)Document 522: the Thai government is 'shutting down the opium dens as scheduled on July 1'.
- UNODC Bulletin on Narcotics — The hill tribes of northern Thailand and the opium problem (1963)p. 35 and footnote 1, citing Proclamation of the Revolutionary Party No. 37, 9 December 1958, for the complete prohibition of sale and consumption.
- UNODC Bulletin on Narcotics — UN/Thai programme for drug abuse control in Thailand (1974)p. 44: the Opium Act of 1959 banned the sale and smoking of opium and closed the Opium Monopoly.
Checked. The date and the event were compared with a source that was read.