Cameras in Classrooms

Have you often wondered why there are Bus Cams but not classroom Cams? I am a parent of a child who was verbally, and emotionally abused by a teacher, it's a horrible feeling seeing your child go through something like this. When my son was 7 years old a 2nd grader he would come home saying how dumb he was and said he wish he was dead, all because of misguidance from a teacher. Many times and like my case the only action that would take place was that my son was removed from the classroom to another. Years later we are noticing similar behavior from our son and he would come home in tears. We took action yet again and are currently dealing with another situation of bullying and belittling from one of his teachers. Unfortunately the schools are ultimately one-sided in discipline and punishment. It is difficult to defend a child in this position since the school professionals tend to band together and tell a one-sided story which usually ends in the child being blamed wholly for any "disturbance". Cameras in Classrooms is a bright solution to many of our bullying cases!
Issues with a child misbehaving in class rooms or teachers misbehaving/abusing, when having meetings for concerns it will no longer be he said she said, this will create problem solving and a less stressful environment for everyone involved! Why are there cameras on buses and NOT in our classrooms! Bullying is growing fast this would be a great way to identify the problem at the beginning and not when it's to late! We as parent should have the right to know what happens behind closed doors!