Gettysburg's unofficial and evasive stance on drugs and alcohol on campus seems to be an indicator that they are here to stay. There does, however, seem to be an internal commitment to keep the College's negative publicity to a minimum. Campus strictness is appropriately severe. If you are smart about bending the rules, you will likely not suffer any consequences for your mild civil disobediences. However, if you push the limits, you will probably find that what comes around goes around.
It is not difficult to skirt by the Man at G'burg. Close your door when you are doing something you shouldn't be, and if you don't do anything to arouse suspicion, then you won't be bothered.