RE:Marijuana prohibition started in the 1930's ? According to Wikipedia by 1933, 29 states had criminalized cannabis
Prohibition begins - 1911
- 1911: Massachusetts requires a prescription for sales of "Indian hemp"[6]
- 1913: California, Maine, Wyoming, and Indiana ban marijuana[6]
- 1915: Utah and Vermont ban marijuana[6]
- 1917: Colorado legislators made the use and cultivation of cannabis a misdemeanor;
- 1923: Iowa, Oregon, Washington, and Vermont ban marijuana[6]
- 1927: New York,[6] Idaho, Kansas, Montana, and Nebraska ban marijuana[7]
- 1931: Illinois bans marijuana.[8]
- 1931: Texas declared cannabis a "narcotic", allowing up to life sentences for possession.[9]
- 1933: North Dakota and Oklahoma ban marijuana.[7] By this year, 29 states have criminalized cannabis