That's sad, but it could have been worse. It's a good thing that the other staff member saw that the teacher was drunk, and reported it right away.
I've been hungover while teaching. It's hard.:D
When I went to HS, there was an little out-of-the-way bar about 10 miles from school out in the sticks. It was widely reported seeing the principal's car in the parking lot there at lunch time.
Seeing that we weren't allowed off school property at lunch, it would have been a little hard to report it.