From infowars.com:

Mexican holiday trumps the Bill of Rights in t-shirt case.

The 9th U.S. District Circuit Court has ruled that the students in a northern California high school did not have their First Amendment violated when they were ordered by officials to turn their t-shirts inside out during the Mexican Cinco de Mayo holiday.

The court said fears of racial violence by students outraged over the American flag displayed on the t-shirts outweighed the right guaranteed by the Constitution. The Live Oak High School in the San Jose suburb of Morgan Hill has experienced racial issues between Latino and white students in the past.

http://www.infowars.com/federal-court-denies-first-amendment-in-california/