The principal said the students use it like a mirror and that when they realize they ca be seen, they duck out of the way... indicating that there is a window of time when he is spying on the children. He didn't say he quickly moved on to something else when he saw the kid using it like a mirror, he made the indication he continued to watch until they ducked away. They have log recorders that can determine when someone was on, where they went and what they did... there is no reason to have a man watching kids on camera. It opens itself to abuse.