Cannabis - Background to legality in the USA
In the United States, the use and possession of cannabis is illegal under federal law for any purpose, by way of the Controlled Substances Act of 1970. Under the CSA, Schedule I drugs are those that have the following characteristic according to the United States Drug Enforcement Agency:
The drug or other substance has a high potential for abuse. The drug or other substance has no currently accepted medical treatment use in the U.S. thereby prohibiting even medical use of the drug.