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The police are public servants, likewise the teachers are teaching in public schools(most are). Children are much more vulnerable than the general public. There should be enough correlation to raise a fuss and raise school boards interests in protecting the education of the communities youth.
Another side benefit would be having a record of classroom behaviors. One couldn't directly video the students but that doesn't mean videos of the teacher wouldn't be helpful to keeping classroom order.
Just doing some quick thinking on the idea.
Those that can. Do
Those that cant. Teach !