Frequently asked questions What are the medical marijuana laws in Montana? Here is an overview of the medical marijuana laws in Montana: 2004 – Voters approved Initiative 148, removing state-level criminal penalties for those with a medical marijuana card. 2011 – SB 423 is passed and the application process changed somewhat. SB 423 meant patients required a Montana-specific driver license or state-issued state ID card, as well as a second certificate by a physician when patients were using cannabis for chronic pain. 2016 – Initiative 182 is approved, and some of the restrictions on medical marijuana in SB 423 and SB 143 are changed, reinstating the state’s original medical marijuana laws. This means that patients with a debilitating illness and physician’s certificate are allowed to access marijuana for medicinal purposes.