Its maddening trying to figure out if they are drinking when you can't tell. I got better at picking up cues from my son- oddly, it was mostly that he was in a better mood. He's much more friendly and talkative when he has a buzz. Before I was 100% convinced he was an alcoholic, I'd ask him to stop hiding it and just drink out in the open. The lying and hiding of alcohol was more upsetting than the actual drinking. Its crazy making, for sure.