In a 3-0 ruling, the court based their decision upon a 1969 ruling by the Supreme Court, which ruled that a 15-year-old girl had the right to wear a black armband to protest the war. We'll let you figure out what it means that freedom of speech issues once involved anti-war statements and now seem to involve stupid pranks.
One final thing-- the lawyer who defended the school? His name was David Crosby. Insert "Teach Your Children Well" joke here.