1937 Marihuana Tax Act - Wikipedia, the free encyclopedia

"In 1969 in Leary v. United States, this act was found to be unconstitutional since it violated the Fifth Amendment, since a person seeking the tax stamp would have to incriminate him/herself.[1] In response the Congress passed the Controlled Substances Act as Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970[2]. The 1937 Act was repealed by the 1970 Act."

If you type "marijuana tax stamp law" in google the first site is for NORML, the second is wikipedia.

Ignore all the other links, it was a result of copying it directly from wikipedia...