Opium Poppy Control Act of 1942
The Opium Poppy Control Act of 1942, also known as the Poppy Control Act, was an act of the United States Congress signed into law by President Franklin D. Roosevelt on 11 December 1942. The official law states that it is: "AN ACT to discharge more effectively the obligations of the United States under certain treaties relating to the manufacture and distribution of narcotic drugs, by providing for domestic control of the production and distribution of the opium poppy and its products, and for other purposes banning all commercial poppy cultivation in most states." Prior to the passage of this act, opium poppies were legally grown and cultivated across many regions of the United States.
Source: Wikipedia — Opium Poppy Control Act of 1942 (CC BY-SA 4.0)