[chippiewill]

I disagree. You don't need a warrant to search your child's phone as a parent.

Teachers have many of the same powers over children that their parents do. Power to detain, to punish, and yes to search.

If you're not happy with that as a parent then you can home educate them instead.

[AlexeyBelov]

I disagree. Teachers don't have those powers unless parents explicitly opt in.

Also, your argument is pretty much "if you don't like it just leave". Which is one of the worst arguments for pretty much anything.