The problem is that districts and schools have tried this, but then parents complain and threaten to sue about "stealing the phone" and such. The district doesn't have a leg to stand on.
They need a state law to back them up so that they can tell the parents to take it to their legislature instead of the principal.
> Unfortunately, no law can protect against poor parenting.
Oh, but they most certainly can. See the aforementioned vaccine laws. Or the law that provides free breakfast and lunch to every California student regardless of income. Of the law that requires dental coverage for anyone in the state under 18 (and provides it to those who can't afford it).
No matter how bad your parent is about feeding you, at least you know you'll get breakfast and lunch every school day, and you can get your teeth checked.
There are many laws that protect against poor parenting.
They have done well in districts my kids have been in.
State wide top down rules is too disconnected from the front lines for me to believe they’re anything but legislative theater.