Tinker v. Des Moines (1969)
Three students wore black armbands to school to protest the Vietnam War and were suspended. The Supreme Court ruled 7-2 that students don't shed their First Amendment rights at the schoolhouse gate, unless speech materially disrupts the school.
The suspensions were overturned; a standard was set for student speech.
Tinker remains the baseline for public schools and universities disciplining student expression.
The university's 'Threatening or Endangering' standard must avoid punishing protected speech, which is why the cases were dismissed.
