Please cite that law to me.
Here is a bit of Justice Thomas’s take on it (while citing the relevant case of Lander vs Seaver)....
Justice Clarence Thomas has argued that Tinkers ruling contradicted the traditional understanding of the judiciarys role in relation to public schooling, and ignored the history of public education (127 S.Ct. 2634). He believed the judiciarys role to determine whether students have freedom of expression was limited by in loco parentis. He cited Lander v. Seaver (1986) which held that in loco parentis allowed schools to punish student expression that the school or teacher believed contradicted the schools interests and educational goals. This ruling declared that the only restriction the doctrine imposed were acts of legal malice or acts that caused permanent injury. Neither of these were the case with Tinker.