WASHINGTON — The Supreme Court ruled Wednesday that a Pennsylvania public school wrongly suspended a cheerleader over a vulgar social media post she made after she didn't qualify for the varsity team.

The court voted 8-1 in favor of Brandi Levy, who was a 14-year-old high school freshman when she expressed her disappointment over not making the varsity cheerleading squad on Snapchat with a string of curse words and a raised middle finger.

Levy, of Mahanoy City, Pennsylvania, was not in school when she made her post, but she was suspended from cheerleading activities for a year anyway. In an opinion by Justice Stephen Breyer, the high court ruled that the suspension violated Levy's First Amendment rights.

But the justices did not foreclose schools from disciplining students for what they say off campus. An earlier federal appeals court ruling in this case would have barred public schools from punishing off-campus speech. 

Breyer wrote that "we do not believe the special characteristics that give schools additional license to regulate student speech always disappear when a school regulates speech that takes place off campus. The school's regulatory interests remain significant in some off-campus circumstances."

The case arose from Levy's posts, one of which pictured her and a friend with raised middle fingers and repeated use of a vulgarity to complain that she had been left off the varsity cheerleading squad.

"F——— school f——— softball f——— cheer f——— everything," she wrote near the end of her freshman year. Now 18, Levy recently finished her first year of college.

Levy's parents filed a federal lawsuit after the cheerleading coach suspended her from the junior varsity team for a year. Lower courts ruled in Levy's favor, and she was reinstated.

The school district appealed to the Supreme Court after the broad appellate ruling that said off-campus student speech was beyond schools' authority to punish.

The dispute is the latest in a line of a cases that began with Tinker v. Des Moines, the Vietnam-era case of a high school in Des Moines, Iowa, that suspended students who wore armbands to protest the war. In a landmark ruling, the Supreme Court sided with the students, declaring students don't "shed their constitutional rights to freedom of speech or expression at the schoolhouse gate."

The court also held then that schools retained the authority to restrict speech that would disrupt the school environment.

Breyer wrote that Levy's case seemed less serious than its Vietnam-era predecessor. 

"It might be tempting to dismiss B. L.'s words as unworthy of the robust First Amendment protections discussed herein. But sometimes it is necessary to protect the superfluous in order to preserve the necessary," he wrote, using Levy's initials because that was how she was identified in the original lawsuit. Levy has granted numerous interviews allowing her name to be used.

In dissent, Justice Clarence Thomas wrote that he would have upheld Levy's suspension.