This guy on my floor is selling C

So there's this guy on My floor who has a dealing type scheme going on here one that I only recently got to know since My roommate tried , he was incredibly hyper for about an hour had the sweats and then went to lie down . It's very secretive but i know the room and the persons name . I feel at an ethical standstill here as the morally right choice would be to turn them in but I don't want any backlash although i don't mind it too much . I don't want my roommate to g3t in trouble though what can I do? any advice ? Does thapar have any specific guidelines on this ?