In 1968, the Staggers-Dodd Bill (Public Law 90-639) is passed by Congress, amending the Food, Drug and Cosmetic Act. The passage of this bill effectively makes possession of Psilocybin & Psilocin illegal on a federal level in the United States.
Source: Psilocybin & Psilocin Timeline (2006). The Vaults of Erowid.
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