It honestly is all up to the person that is the RA or what ever. Some of them are the chillest people around and let too much shit happen. For example my RA was only and RA so she could afford going to school. She honestly didn't give a shit what we did whether it was smoking/drinking and she caught us a lot. As long as we weren't being obnoxious and we were safe everything was cool.
I am sure most college campuses are a little sketchy in the aspects of under age drinking and cannabis use since educational institutions are subject to the same laws as the state and federal government. If the colleges allow laws to be broken they have a chance at loosing funding and other bad things.
I am sure WWU is very lenient in terms of colleges and you shouldn't be partying in the dorm, noise and underage drinking is sketch anywhere unless you are quite and considerate of other peoples living spaces. Its about being smart. There are private schools that are far more fucked for what you did that could get you expelled in some places, it happened to a friend of mine. Be considerate of others and realize you are breaking the law by underage drinking so be smart about it, not a dumbass please. Some people are so stupid about this stuff and act like it shouldn't happen when they are drunk under the age of 21. The law may be stupid but its the law so be stealthy.