Although the treaty does seem to be pretty clearly prohibitionist, there is some debate (covered under "Possession for personal use", https://en.wikipedia.org/w

Although the treaty does seem to be pretty clearly prohibitionist, there is some debate (covered under "Possession for personal use", https://en.wikipedia.org/wiki/Single_Convention_on_Narcotic_Drugs#Possession_for_personal_use https://en.wikipedia.org/wiki/Single_Convention_on_Narcotic_...) as to whether or not the treaty requires member states to prohibit possession for personal use.