Michigan Dispensary Laws On November 4th 2008, through a referendum it was decided to allow qualified patients to legally possess, cultivate and use medical marijuana. The related law was passed on December 4th 2008 and was named as “Michigan Medical Marijuana Act”. in Public bookmarkswith medical_marijuana_michiganmichigan_dispensariesmichigan_weed Note: On November 4th 2008, through a referendum it was decided to allow qualified patients to legally possess, cultivate and use medical marijuana. The related law was passed on December 4th 2008 and was named as “Michigan Medical Marijuana Act”.