Thailand's Psychotropic Substances Act is a law designed to regulate certain mind-altering drugs.
According to the Office of the Narcotics Control Board, "The Act directly resulted from the Convention on Psychotropic Substances 1971 of which Thailand is a party."
The Act divides psychotropic drugs into four Schedules.
Offenses involving Schedule I and II drugs carry heavier penalties than those involving Schedule III and IV drugs.
Note that this statute does not regulate most opioids, cocaine, or some amphetamines.