Every now and then there's a flurry of questions, and debate, about qualifications needed for the "teacher's" discount. You'll hear "I'm a... Teacher's Aide, Student Teacher, Sunday School Teacher, Home Daycare Provider (that offers educational instruction), Volunteer Asst. School Librarian, Class Parent, Teacher's Pet, etc." Your best bet is to call them and ask them directly. No official policy has been offered.
However, based on reports back from people that have called, here's the impression I've been given as to what they mean by "teacher". It's someone who's paid to be in charge of group of pupils on a regular basis and is charged with providing them educational instruction. But like I said, nobody here is the final arbitor... if you think you qualify then give them a call. That way we can avoid debating who's deserving and under-paid, and who isn't.