Marijuana Criminalized: The 1937 Tax Act

Harry Anslinger needed an enemy. The head of the Federal Bureau of Narcotics had watched his agency's budget shrink after the repeal of Prohibition, and he found a new target in marijuana. The Marihuana Tax Act of 1937, signed into law on August 2, effectively criminalized cannabis across the United States through a punitive tax-and-registration scheme so burdensome that legal compliance was nearly impossible. Anyone possessing marijuana without the proper tax stamps faced federal prosecution. The campaign to pass the Act relied heavily on racial fear and sensationalist media. Anslinger promoted stories linking marijuana use to violent crime among Mexican immigrants and African Americans, testimony that bore almost no relationship to scientific evidence. William Randolph Hearst's newspaper chain amplified the message with lurid headlines. The American Medical Association actually opposed the bill, with its legislative counsel Dr. William Woodward testifying that the AMA had not been properly consulted and that the claims of marijuana's dangers were exaggerated. Congress largely ignored the medical establishment. The House debate on the bill lasted approximately 90 seconds. When a member asked whether the AMA supported the legislation, the committee chairman falsely replied that it did. The Senate passed the bill with similarly little scrutiny. President Roosevelt signed it without public comment. The Act did not technically ban marijuana outright but made it functionally illegal through impossible bureaucratic requirements. Possession without tax stamps became a federal offense carrying stiff penalties. The law's framework shaped American drug policy for decades, surviving until the Supreme Court struck it down in 1969 on self-incrimination grounds. By then, Congress had already replaced it with the Controlled Substances Act of 1970, which classified marijuana as Schedule I alongside heroin. The 90-second debate of 1937 cast a shadow over American criminal justice that persists nearly a century later.