As in all situations know what the rules are going in. If your son finds himself in a situation that may cause trouble he has to make a decision. As parents the "we know it is going on mentality" has to be tempered with we know but you better not be involved and if you are you face the music. The college situation is much different than high school as they are on their own and sad to say drinking is glorified as a right of passage in those years.