A bit of a serious question here.... I have a friend (yes, really!) who I think drinks too much for her own good. I would conservatively estimate maybe an average of 5-6 units every day. However, she seems pretty functional in work and social situations. I don't see the classic signs of alcoholism apart from the number of empty bottles. She's in denial about how much she drinks and I was wondering - are there any tests that can be done to show it before it's too late?