Quite a problem - and it's wider than schools. TSA grope lines are another example. Significantly, so is gun control itself: its prior-restraint component treats law-abiding citizens as potential criminals. Just like "student control" treats kids as potential criminals.

What do all of these have in common? Rational-legal systems that expect the enforcers to act like strangers without street smarts. As is so often the case, adverted benefits ("disinterested") come with unadverted costs.