The legal history of cannabis in the United States relates to the regulation of marijuana use for medical or recreational purposes in the United States. Regulation of Cannabis sativa began as early as 1619. Increased restrictions and labeling of cannabis as a poison began in many states from 1906 onward, and outright prohibitions began in the 1920s. By the mid-1930s Cannabis was regulated as a drug in every state, including 35 states that adopted the Uniform State Narcotic Drug Act. In the 1970s, many places in the United States started to abolish state laws and other local regulations that banned possession or sale of cannabis. All this is in conflict with federal laws; cannabis is a Schedule I drug according to the Controlled Substances Act of 1970, which classified cannabis for Abuse..
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