Is it illegal to have cameras in a classroom?

It is illegal to have cameras in the bathroom of any state by law. Depending on what kind of video camera you mean. A personal video camera in the bathroom is legal as long as you are not filming somebody dumping. That's just wrong. It's child pornography. Now, it is illegal to put video cameras in bathrooms for security reasons by US law. Washington may have a different law on that. Check the state site if this doesn't help.