Fail
I've seen signs like this on classroom doorways across the state and wonder when we'll ever get a clue. In my experiences as a teacher, engaging the students can be one of the most difficult aspects to teaching. With that in mind, why would we ever want to ban a tool that - when used properly - can instantly connect a teacher with their students?
Unless, of course, there are policies in place (AA419, II A 7) directing one's behavior. So much for teacher autonomy.
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