Let’s not forget one thing here also, if he is under 21, what he is doing is illegal. If he is caught, you, and everyone in your apartment, but especially you as his roommate, could get in trouble.
Yes, this! I completely forgot that you are all under age. If someone else calls the police (for example, one of your neighbors calling in because there is some guy yelling and banging on the doors and windows of the neighbor’s place) then you could all be considered guilty by association. Especially if he’s keeping alcohol somewhere in the house. It will be very difficult for you to prove that you didn’t know it was there.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.