The campus police are fairly strict at Loyola. They drive around campus at night, especially on weekends, looking for any students who are misbehaving or seem intoxicated. They will also respond to noise complaints in the dorms, and if there is alcohol found in the possession of someone who is underage, they will fine without warning.
The RAs on campus are very strict as well. They do rounds each night and listen for noise violations, etc. They have written up many students for a number of different parties that have occurred on campus. Many students drink off campus to ensure that they do not get fined. They are also very serious about parking tickets on campus. Be sure to park only where your parking permit allows you to or else you are sure to get a ticket.