Trying to identify old high school comedy
I'm looking for the title of a high school comedy I saw on the MGM Movie channel some years ago. It was set in an tough inner-city high school, American or possibly Canadian. From what I can recall it was an '80s movie, though I can't be 100% sure on that. The only scene I can remember is a teacher getting ready to go into the boys' bathroom where a gang has an entire operation of some kind going on. All very vague, I know, but does it ring a bell with anybody?