If there is an emergency, a parent can deal with it the same way they would have 20 years ago: call the school, and they will send someone to grab your kid from

If there is an emergency, a parent can deal with it the same way they would have 20 years ago: call the school, and they will send someone to grab your kid from the classroom. This was not a particularly rare occurrence when I was in school. The parent has to talk to the school on the phone to release their kid from class anyway.