This may be true in some school districts in the US. In the US all public schools are managed at the local level by a school district, ruled by either a town, city or county government. These local school districts must obey the rules of the State that they are in. The US Federal Government has no rules for school districts per se. But, the Federal Government makes funding available to school districts for specific purposes, like teaching physics or English as a Second Language (ESL), for example. The US Federal Government can then place "conditions" on this funding that have the same effect as a rule on the local school district. That is if the school district does not follow the "conditions" it does not get the money. I personally know of NO school district here in my State of Virginia that allows parents to consent to a teacher or school administrator striking their child. Perhaps this option exists in other of our 50 States.