The Controlled Substances Act (CSA) is a United States federal law. It controls what drugs American people and companies can have, make, import, and use. It also controls what drugs doctors can prescribe.
"Controlled substances" include illegal drugs, chemicals that are used to make illegal drugs, and some medications. If a government has rules or laws about a certain drug, then that drug is called a controlled substance.
The United States Congress passed the law as part of the Comprehensive Drug Abuse Prevention and Control Act of 1970. President Richard Nixon signed the bill into law on October 27, 1970.[1]