It occurred to me that reefer is so cheap in Michigan, it seems likely people would be buying it in quantity and then transporting it out of state and reselling it at a huge mark-up. But apparently there is a 2.5 oz limit per transaction. They scan your license at the door and there's cameras all over the place so they have a picture associated with a name and automobile. It's watched and regulated - for one very good reason - the State wants their cut and they don't want anyone thinking they can cheat.