at least where I'm from in the south, it's pretty common knowledge that being a teacher is one of those professional avenues that you just DO NOT get piss tested for. I don't know the deal out west, but yeah, to be honest, a lot of teachers, at least where I'm at, might decide to become teachers just BECAUSE they KNOW they're not going to get piss tested. Because, at the same time, weed is very illegal in my area and a lot of jobs, not even good ones now, do piss test.
Of course, at the same time, it's not like being a teacher is a great job considering the pay and the hours, but in this economy, there's certainly nothing to complain about. It does seem to be one of the best jobs, at least in my area, that you can seriously think about without having to worry about getting piss tested for weed...
That being said, you still got to pass all the interviews and get your teacher certification, so good luck to you...not the hardest shit in the world, but you do have to go through the usual job bullshit first...
But lol, as an add on, at my high school, I got the picture that most of my teachers were raging alcoholics. And alcohol is something that definitely fits in with the teacher mentality, and it's not like you're going to be kicked out for drinking every once in a while on your own time, that's for sure...
Oh and also, of course, there's always the professor route. If you're a tenured professor at a university, you, my friend, are totally in the clear, do whatever the fuck you want...