On my dorm hall we have an alcohol fund that is around 8 people. I was recently appointed book keeper so It’s my responsibility to keep track of everything. 

There’s a kid who came into a pregame and poured himself a drink, when I confronted him he said he paid in last time. I then asked the guy who collected money last time and he said that no the kid did not pay on, instead he paid $5 to drink for a single night. 

At this point I just want to ban the kid from consuming or pitching into the fund. He lied straight to my face so I don’t want to handle is money. Is this too mean to effectively exclude him from hanging out?