The Maine medical cannabis bill was approved on November 2, 1999 The Maine medical cannabis bill was approved on November 2, 1999, after receiving 61% of the votes. It was implemented beginning December 22, 1999.   With the approval of the medical cannabis bill in Maine, state-level criminal punishments on using, possessing, and growing of cannabis by certain patients that have valid medical cannabis identifications are removed.People suffering from seizures due to ...