On Nov. 2, 2004 "Montana becomes the 10th state to allow the use of marijuana for patients whose doctors have prescribed it to treat various ailments, such as chronic pain or nausea." Nov. 3, 2004 - LA Times
Editor's Note: Two states, Arizona and Maryland, are often not counted in this total, which would make Montana the 12th state to approve the medical use of marijuana. Arizona's vote was voided by the courts, and Maryland's protects medical marijuana patients from jail, but not from arrest.
To see our chart of all 12 states and their laws, click here. To read Montana's initiative, in pdf format, click here.