Samuel Caldwell is the name of the first man who was arrested for possession of marijuana in 1937. He received four years in prison and a fine of $ 1,000. That same year Marihuana Tax Act was passed on to the law, which came into force on 2 August. Then, it was not illegal to possess but to sell. In 1970 banned both the possession and sale by Controlled Substances Act The document. Every year 900,000 people were arrested for possession of marijuana.