Are teachers legally allowed to keep you after school because “the bell doesn’t dismiss you, I do”?
“There is no legality about it in any way. Laws do not regulate the bell system in schools. Many times a teacher will get caught by the bell and not have completed something important for the class. So, a good student will wait for the teacher stops before jumping and running like a Pavlovian dog.
As a teacher, if another teacher had held students and caused them to be late to my class, we would discuss the reason. A teacher doesn’t have the right to cause a student to miss part of another teacher’s class”. Said Don Elliott
“There is such a thing as mutual respect: respect for the teacher, respect for the students, and respect for the subject at hand. Of course, when the bell rings, you can get up and leave. There is no rule that will force you to stay. But when you do that, it sends a message to the teacher and the class, and that message is one of not caring about and disrespect for the subject or the teacher or the class.
Often, when a teacher wants you to stay put in a classroom, it is for one of a few reasons. There may be a minute or two of winding up the lesson or there may be danger outside the room. It is not generally to prove strength or power.
One of the best lessons in any class I taught was when we were writing a group poem after having read a short story called “Red” by Yevgeny Yevtushenko. The bell to lunch rang around the final couplet that the group was composing, and no one got up to leave. It took a few more minutes to complete our poem, and then I escorted them all to the lunchroom to explain why they were late. I have to say it was one of the highlights of my 35-year career”. said Maxene K
All that from Quora