Personally, I'd say he's a huge liability waiting to happen. What if he gets drunk at work, leaves, and hops in a car and ends up killing someone? What if he ac

Personally, I'd say he's a huge liability waiting to happen. What if he gets drunk at work, leaves, and hops in a car and ends up killing someone? What if he accidently mucks something up (deleting code, pushing something into prod that shouldn't, etc). Perhaps his manager needs to sit him down and say that while they appreciate that he could be more productive while drunk, they can't have him drinking at work nor working while drunk, and the company is fully in support of him seeking treatment and therapy to help him. Your company is enabling him and indirectly taking advantage of his problem because it's temporarily increasing productivity. In all likelihood he will get fired over this. If he has a sympathetic manager and team that can intervene and he's willing to get help, it could eventually work out. That's my $0.02.