Re: Sensei -- drinking??
Around 12 years ago, one of our teachers would sometimes come to class a bit worse for wear. You could in fact smell the alcohol on him. But once the warm up was over and we started doing waza, he was fine, as good as he was on non-drinking days. We never said anything about it to the other teachers who were his seniors, because we thought it wasn't our business. It didn't affect our learning in any way. Might have even helped us accept that teachers were people too.