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And 20 more states have legalized medical marijuana: Arizona, California, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Montana, Nevada, New Hampshire, New Jersey, New Mexico, New York, Pennsylvania, Rhode Island, and Vermont.
State Marijuana Laws. In November 1996, California became the first state to legalize marijuana for medicinal purposes. Currently, there are: 1  22 states have legalized marijuana for medicinal purposes.2  16 states have decriminalized personal possession of marijuana.onflict between State Law and Federal Law. Federal law clearly conflicts with many state laws concerning marijuana. Under the Preemption Clause of the Constitution, a federal law will always trump a state law.