Today’s Dariano v. Morgan Hill Unified School Dist. (9th Cir. Feb. 27, 2014) upholds a California high school’s decision to forbid students from wearing American flag T-shirts on Cinco de Mayo. The court points out that the rights of students in public high schools are limited — under the Supreme Court’s decision in Tinker v. Des Moines Indep. Comm. School Dist. (1969), student speech could be restricted if “school authorities [can reasonably] forecast substantial disruption of or material interference with school activities” stemming from the speech. And on the facts of this case, the court concludes, there was reason to think that the wearing of the T-shirts would lead to disruption.