Guys, I think this teaches us a few lessons. First of all, we are all paranoid fucks. Second of all, it is silly that marijuana, at least for medical purposes, is still illegal in so many states. Third, people shouldnt have to live in fear.
I agree, I think your plan sounds good. Put em' in a rubbermaid in the car for a few hours, then return them when they're done. Sounds like a plan to me!