Marijuana for Medicinal Purposes In 1936 when Marijuana was made illegal it was considered a medicine in good standing with the American Medical Association. At the time Marijuana could be found in twenty eight different medical products and countless other consumer products. On November 5th, 1996 California and Arizona passed propositions allowing the return of medicinal Marijuana use. The campaign in 1936 to make Marijuana an illegal substance was championed by two large companies, Dupont Chemicals and Hearst Newspapers, that gained financially by having Marijuana banned. For Hearst Newspapers it was to protect the investment that