Mann Middle School in Colorado Springs has banned students from wearing rosaries as visible necklaces. School officials have offered two different rationales: some gang members wear rosaries as gang symbols; some Catholics are offended by the wearing of rosaries on the neck. A Colorado Springs Gazette editorial on the controversy quotes Eugene Volokh and David Kopel, and concludes that the ban is almost certainly a violation of the First Amendment.
Not that the constitutional question depends in the slightest on whether wearing rosaries is allowed by Catholic doctrine, but as the editorial notes, the Diocese of Colorado Springs confirms that such wearing is allowed. And St. Louis De Monfort, who is probably the most influential pro-rosary advocate of all time, included in his book The Secret of the Rosary some stories in which wearing the rosary, including as a necklace, was shown to be divinely approved.
Note also a similar case from Schenectady, N.Y.: after the American Center for Law and Justice filed suit, the federal district court for the northern district of New York entered a TRO ending the student’s suspension for wearing a rosary. The school board repealed its rosary-wearing ban.