Tinker v. Des Moines Independent Community School District (1969): A landmark Supreme Court case that established that students' free speech rights are protected unless it causes substantial disruption to school activities.
Hazelwood School District v. Kuhlmeier (1988): A Supreme Court case ruling that schools have more leeway in regulating student speech if it is part of official school-sponsored activities.
Morse v. Frederick (2007): A Supreme Court case where it was ruled that schools can limit student speech promoting illegal drug use even if it occurs off-campus.