The school assumes the role of guardian while the child is in school.
We had an issue, close to 30 ago with our daughter. To say they over stepped their bounds (le & school district) would be an understatement. However after consulting with more than 1 attorney i was told there were grounds to move forward.

BUT..... the school admin will say they were acting on what they "thought to be" the best interest of the child. LE will say they acted on school authority request.
The question we were asked was. How much would we like to spend to pursue the questionable violations that were present. LE apologized, the school admin didn't give 2 shits.

The teacher who started the ball rolling took some admin leave and never apologized. She was "acting on her feels" just 1 more reason those in the education system have done so well brain washing public school kids.