Current precedent relies on a 1982 case in which five justices generally agreed there were limits on a school’s power to ban books, but they didn’t agree on why.
The Mahanoy v. B.L. ruling did not give schools or free-speech advocates the clear lines they may have wanted, but it did attempt to address some of the complexity of modern-day speech.
New laws pending in Wisconsin and North Carolina would require public universities to punish students who disrupt campus speakers. But these laws would do more to hinder free speech than protect it.