US Drug Enforcement Agency places MDMA on Schedule I.
Mexican law prohibits psilocin and psilocybin.
United Nations Convention on Psychotropic Substances lists psilocybin as a Schedule I drug.
The UK enacts the Misuse of Drugs Act 1971, categorizing psilocybin as a Class A drug.
The Comprehensive Drug Abuse Prevention and Control Act is passed by the US Congress and psilocybin, LSD, and other hallucinogens are placed on Schedule I.
Staggers-Dodd bill is passed, banning the possession of psilocybin and psilocin in the US.
France lists psilocybin mushrooms as a narcotic.
California outlaws LSD.
Belgium prohibits the cultivation of hallucinogenic mushrooms.