Ohhhh. Well. Had he ever been warned about his drinking? Is this the first time? Where was he when you found the bottle?
I suspect I'd either take him to the boss or can him myself, which ever is appropriate to your situation. Cause I'm going to guess this wasn't his first time at the rodeo since he brought a bottle with him.
Not that I thought about it much before I sobered up, but after I had damn little tolerance for people drinking/doping at work. I had the opinion that I am entitled to work in a safe environment and a drunk colleague can represent a danger to me.
Now I'm waiting to see what you did.
you are so right. it is dangerous to others, but mostly to our reputation, and to himself. Next week is salary reviews, and I can't see this being positive for him