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Irish physician and assistant surgeon and professor of chemistry at the Medical College of Calcutta, William Brooke O'Shaughnessy, is credited with introducing the therapeutic use of cannabis to Western medicine in the 1930s.
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Under the Harrison Act, the use of marijuana was considered a crime.
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An advertisement for cannabis americana distributed by a pharmacist in New York.
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Important events pertaining to medical marijuana
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The United States banned cannabis in a federal law and 23 states outlawed use of marijuana.
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Six U.S. states' health departments performed studies on the use of medical cannabis. These are widely considered some of the most useful and pioneering studies on the subject
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Physician Tod H. Mikuriya reignited the debate concerning cannabis as medicine when he published "Marijuana Medical Papers".
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This law requires the court to consider a defendant's use of medical marijuana to be a mitigating factor in marijuana-related state prosecution. If the patient, post-arrest, successfully makes the case at trial that his or her use of marijuana is one of medical necessity, then the maximum penalty allowed by law would be a $100 fine.
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Attorney General relaxes punishment fpr medical marijuana-users.
