“Spurred by spectacular accounts of marijuana’s harmful effects on its users, by the drug’s alleged connection to violent crime, and by a perception that state and local efforts to bring use of the drug under control were not working, Congress enacted the Marihuana Tax Act of 1937. Promoted by Harry Anslinger, Commissioner of the recently established Federal Bureau of Narcotics, the act imposed registration and reporting requirements and a tax on the growers, sellers, and buyers of marijuana. Although the act did not prohibit marijuana outright, its effect was the same. (Because marijuana was not included in the Harrison Narcotics Act in 1914, the Marihuana Tax Act was the federal government’s first attempt to regulate marijuana.)”
“By the time the federal government passed the Marihuana Tax Act in [Oct.] 1937, every state had already enacted laws criminalizing the possession and sale of marijuana. The federal law, which was structured in a fashion similar to the 1914 Harrison Act, maintained the right to use marijuana for medicinal purposes but required physicians and pharmacists who prescribed or dispensed marijuana to register with federal authorities and pay an annual tax or license fee…
After the passage of the Act, prescriptions of marijuana declined because doctors generally decided it was easier not to prescribe marijuana than to deal with the extra work imposed by the new law.”