The cops won't pee test him.

If the cops do get back to him, they will most likely give him a summons to appear in court. Your friend should prepare for a random knock on the door. Don't have the place clouded up when they come and don't answer the door with a bong in your hand and you'll be fine.

I wouldn't worry about a pee test until a judge orders one. He might get ordered to pee test as part of a probation order. The legal system is pretty slow. It could take months before he goes to court and gets sentenced to probation...if at all.

But, I ain't no lawyer, what do I know?