Marijuana use in Michigan is illegal without a valid medical condition, and is a $100 charge, misdemeanor and a 90 day max jail sentence. Medical marijuana patients either have to grow it themselves, or obtain it from a caregiver, who may not dispense it to no more than five patients. As it varies from county to county, the purchase of medicinal marijuana in Michigan with be extremely difficult to do, legally. Searching for dispensaries online, may be your best bet.