Re: Sensei -- drinking??
Myself, and 2 instrs. always have 2-3 beers after class, never before class, and talk about how class went. If you smell alcohol on a sensei's breath during class, I couldn't tell you how to handle it other talk to a senior student and raise the concern thru him. If it gets worse, I'd find another dojo because you never know how someone will react to a stimulus while "lit". You don't need to lose any teeth.