I just moved to Interlochen, and plan on growing mmj, as well as voting for legalization in Nov. As a former cop, you can only legally stop someone if you have probable cause (A valid, provable reason) to suspect that anyone involved in the stop, (not just the driver) is committing a crime. Technically, an officer can arrest you for DUI for cannabis because you’re not supposed to operate a vehicle while “under the influence” of any drugs or alcohol which includes mmj. Know your rights, and report d-bag cops if they show prejudice towards you, or are using bully tactics. Its the only way to make it stop.