How would you feel about this situation?

A mum has been left annoyed after her son's school tour was sent home in the middle of the night. A small number of the boys on the tour were found with an illegal substance so the teachers decided to send the entire year home. Taking the Mumsnet, the mother said:

"My 16 year old is on a school trip. They left on Sunday and were due back tomorrow evening. They were having a great time. After dinner this evening they were told some (unnamed) kids were caught with illegal substances and they were all to pack up immediately to be shipped home. They are a 5 hour drive away and will now get in at 2:30 am. I, and most other parents, have to be up a few hours later for work. "AIBU to think this is an extreme reaction? "It is probably relevant that this school group have been trouble from their first year in secondary. Despite the majority of the group being well behaved they are always (all) in trouble because of the actions of those few who are lacking in the cop on department."

There were mixed reactions in the comments section, with one saying she is right to be annoyed about the whole situation:

"YANBU! That’s really unfair on the ones who didn’t do anything wrong and annoying for parents who will potentially only get a few hours sleep before work now."

However, another said that she has to remember that the kids are the teachers' responsibility and they probably don't want to deal with that.

"You don’t know what drugs the dc have, or who they would of gave them too. If your child had been put in hospital after an illegal drug you wouldn’t think it was an extreme reaction. "Unfortunate for the innocent but 100 percent the right call."

What do you think you would do in this situation? Do you think the kids should have been sent home?