Legal Question in Criminal Law in New Hampshire

Re: marijuana dealing

Hard to say without more details. You can't be guilty of dealing or selling marijuana if you had no knowledge of what was going on. If you did know, the question will be whether you are seen as having assisted in any way, in which case you might have some problems. And, just knowing the marijuana was there and allowing might be interpreted as you having "constructive possession."

Regarding your friend, what happens to him will depend on a number of factors including how strong the case is against him, how much quantity he was allegedly dealing, his prior record, if any, etc.