Unfortunately you seem to be assuming that the principle started it and/or the student was completely innocent in this and similar cases. I'm not so sure about that.
While I will agree that students with camera phones will help document the problem teachers, I also believe that its too easy to take a portion of a situation out of context and abuse the evidence so to speak.
I love how some issues end up with the majority concluding which party is the victim and which is the victimiser regardless of the full story and/or lack of evidence to come to a reasonable conclusion.
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