one teacher with same kids all day,
How would the same teacher all day work in a middle or a high school where kids change classes and teachers are specialized for different subjects?
They can’t. Teachers are only certified in certain subjects so a History teacher can’t teach Chemistry, etc..
This is a nightmare.
depending on how their credentialing is set up they COULD do it but it would be a great disservice to the students and the teacher's -
in some states traditional elementary teachers are given k-12 multi subject credentials but can only teach muliple subjects in a single self contained classroom (so basicly what you see in k-5th or 6th). when i got my k-12 back in the 80's in california i was told that i would never see anyone with one ever teaching middle or high school b/c noone did 1 room schoolhouses anymore. surprise, surprise-both my kids ended up being taught in k-8 one room schoolhouses by someone with an identical credential to mine.
so........if the districts pushed on it-they could move people with elementary credentials into those middle/high school classrooms and be within the law. given the situation though-some states may pass emergency provisions that permit single subject credential holders to teach multiple subjects.