BUCKEYE, AZ (KPNX) — When Mariah Havard arrived at Arizona’s Buckeye High School for picture day Tuesday wearing a Black Lives Matter T-shirt, the 10th grader says she was told to go to the school’s office, where she says administration leaders told her the shirt wasn’t allowed.

“I wasn’t able to wear the shirt anymore because somebody made a complaint,” Havard said. “I was a little bit confused as to why I wouldn’t be able to wear something so meaningful to me.”

Havard says the assistant principal cited the school’s dress code policy, which bans clothing and accessories which can “disrupt the education process.”

Havard’s family and others believe the 15-year-old was treated unfairly, especially because they say the school has a history of allowing students to wear shirts supporting a cause, including some that could be considered offensive.

“I’ve seen gay pride shirts, I’ve seen confederate flags,” said student Genesis Santoyo, ‘I’ve actually seen a white power shirt once.”

After Santoyo filed a complaint claiming the school had a double standard, officials announced Confederate flag clothing would also no longer be accepted on campus.