> provided that you are in a one-party consent state
Is there an expectation of privacy in a public school classroom?
I'm no lawyer, but if I had to bet, I would assume that the wiretapping laws that would no doubt zealously be applied to such a recording event (if it ruffled the right feathers) wouldn't have an exception for that, as they were written before even speakerphones came into wide use.
I can't imagine any good reason for that policy other than covering for terrible people.