One of the points the parent's lawyer made is that the school asks parents to sign permission forms for possible videotaping or recording in the classroom, so there is no credible expectation of privacy:  it is a public forum which is already possibly being recorded.  

Reading through the comments, it sounds like this school district has a very deep problem.  I realize that teaching in any classroom is difficult, but a special needs classroom is especially challenging.  It's easy to burn out and lose perspective; people need to be shifted around for their sake and the sake of those students.  Some just need to be replaced.