Well in my day the teacher would have called the parents, not the police.
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Well, “your day” is no more. There’s every likelihood that this out-of-control “student’s” parent(s) couldn’t be contacted, refused to intervene or simply DIDN’T CARE.
Good list HA, but you missed one possibility. There is a good chance that the parent will intervene on the side of their child (the student), using threats of lawsuits against the school, etc.