Here is a LINK to a story about a Special Ed teacher who has been arrested and charged with physically abusing the students in her care. It came about because of hidden cameras placed by police. Sadly the woman is only getting 21 days in jail for a crime which should warrant much, much more.
I work alot with the special ed community and this is a big issue we are pushing. Kids in special ed often cannot communicate properly and many bad things happen from abuse to the teachers just not doing their jobs. I know one where the teacher basically sat on her computer all the time doing Facebook or shopping and the kids would sit on the floor with toys.
You may not realize it but special education rooms are often stuck in far corners of school buildings and are rarely visited by principals. Another is that parents are not allowed to observe the special ed classroom without permissions and strict guidelines. Staff have a big code of silence.
So anyways we are pushing for laws requiring cameras. Texas is the first state to do so and we want many more.