Six months of regulated medical marijuana sales have passed in Michigan, but the market is still dominated by an illegal source of product. Only seven percent of medical marijuana sold by licensed provisioning centers comes from licensed businesses, while the other 93 percent comes from caregivers. While officials are allowing the more-than 40,000 licensed caregivers to provide the product to provisioning centers, it isn't actually legal. MORE ►Meet the referee of Michigan's marijuana industry |