While they would tell you otherwise, the unofficial policy of campus police seems to be "if we can't see it, and it's not bothering anyone, we'll let it slide." Drinking goes on in the dorms virtually every night to some degree, and as long as doors are shut and nobody is making any kind of disturbance, the campus police and Residence Life staff are fairly lenient. To those who do get caught, written warnings, fines, and double-secret probation await the not-so-wise. As for parties, the campus police usually have little, if any, jurisdiction for the larger parties which almost always take place off campus. The Cincinnati or Norwood police will usually put an end to things rather quickly if there are complaints of noise or if there are a lot of people wandering around on the front lawn. The one exception to this is the Pig Roast, the end of the year bash where Cincinnati's finest are there simply to make sure no one gets hurt. A general rule among Xavier students is: "don't act stupid, and you won't be cited."
Overall, it would be safe to say that the campus has a comfortable level of strictness. Campus police realize they cannot control every action each student takes, and they act accordingly. Potentially dangerous or annoying behavior is often shut down if it's in public, but there is nobody breathing down the student body's neck telling everyone what they can and cannot do. Most officers here look to protect students rather than punish them. Generally, the students feel safe and free to do whatever reasonable college activities they want.