I think by now its pretty obvious that every time there was a "glitch" and the green light on the camera flashed, a picture was sent in. I've had macbooks for years and I've never seen the camera light blink like described.
Someone in that IT dept was collecting pictures of students. My moneys on Mr. Perbix, thanks to his overly smug god of IT attitude. This story is going to get much worse before we see its end.
Parents seem to have weird privacy expectations of their kids but you can be sure they will scream bloody murder over a peeping tom.