I like the idea of packing restrictions--stupid as sin laws are, they would be necessary for anything of this sort to pass in America (esp. during the conservative upswing in recent decades).

I had a similar idea once. Cops bust you for open beer--they bust you for open pot. So the pot could come in sealed (not zipped, actually sealed) bags from the vendors that would (in all likeliness) be the medium you get it from if it were legal. This would also be a way to prove you werent dealing with the black market.

Cop: You been smokin that bag boy?
:rastasmoke: No, sir, it's unopened.