The problem here is the campus dorms are part of the school and they can have much more restrictive rules than the general state laws; especially for minors. This is all for the protection of minors. So your son's roommate's parents in the eyes of the law could have been held liable for a lot worse because the public policy here is if the parents are there to protect the child from himself and others, then it is allowed. However, once his parents dropped him off drunk or inebriated at the school, he still posed a threat to himself and others and his parents pretty much broke the campus rules and possibly the main state law for this final act. What should have occurred is the parents should have waited to ensure he would pass the breathalyzer or spent the night with them and then returned to school. I am sure if someone challenged the results perhaps the the sobriety test results would be reversed. Essentially this is going to come down to a public policy challenge and whether the dorm laws are more restrictive.