One of the most hilarious things to witness is a group of people at work discussing whether someone is an alcoholic and what to do about it. Inevitably, said person is not an actual alcoholic and just likes to party. Also, inevitably, the people having the discussion are the kind of people who would think "likes to party"=alcoholic. As a general rule, if you have to ask how to know if a person is an alcoholic, you have no business getting involved.
sincerely,
steve dave (practicing binge drinker)