If I put my friend's piss in a condom, will I be good to go?

[Mississippi Steve]

Not that easy and in some cases medically harmful if using MMJ.

If its in a state where MMJ is legal, and the person has a *legitmate* MMJ card, and medical doctors prescription, then it shouldn't be an issue. OTOH, if its somebody thats scamming the system and just using it to get stoned, then its a different story.