A California school dispute that arose when students wore shirts emblazoned with the American flag on Cinco de Mayo could prompt the Supreme Court to take a new look at free-speech rules for high schools. Ever since students protested the Vietnam War by wearing black armbands, the justices have said the 1st Amendment protects the rights of students to peacefully protest at school, so long as their actions do not lead to a "substantial disruption." In recent years, however, some school officials have moved to curtail political fashion statements such as wearing T-shirts with Confederate flags or anti-gay slogans.