They just need to start suspending these clods and send them home to Mommy when they don’t want to respect Teachers or school security. Escort them out of the building.
If they don’t have Mommy or Daddy (if they even know who he is). and they try to come back on school property, without a parent, you can always have them arrested for trespassing. Then it becomes a criminal issue. If you keep dragging Mommy off to school - pretty soon she’s going to get tired of this nonsense.
If they don’t come back I believe there are some truancy laws that cover that. But then, if they never come back - don’t see that as a problem either.
That’s assuming the mom comes to the school.