DALLAS – A high school transgender student claimed a regional championship for girl’s wrestling Saturday, despite the fact that she’s taking steroids to transition to a male.

Trinity High School junior Mack Beggs is so far undefeated this year and she took home the 110-pound Class 6A Region 2 championship Saturday after opponent Madeline Rocha refused to wrestle and forfeited the match, NBC DFW reports.

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Beggs is at the center of a lawsuit filed by a parent against the University Interscholastic League over the 17-year-old’s use of banned steroids.

According to WBAP:

While the drugs are banned through UIL rules, the organization does allow them if they prescribed by a doctor “for a valid medical purpose.”

The parent in the lawsuit against the UIL say allowing Beggs to compete against the girls while taking steroids invites “imminent threat of bodily harm.”

“Just because she’s (changing) from female to male doesn’t give her the right to compete against other kids who aren’t taking those drugs,” an unidentified father whose daughter faced Beggs on the mat told the news site.

“I do not think she should have been allowed to wrestle at all, either as a male or female, if she’s taking these drugs,” he said.

The lawsuit, filed by Coppell High School parent Jim Baudhuin, calls on the UIL to suspend Beggs for steroid use, and the father said it has nothing to do with Beggs’ gender identity, according to The Dallas Morning News.

“I respect that completely, and I think the coaches do,” Baudhuin said. “All we’re saying is she is taking something that gives her an unfair advantage. It’s documented. It’s universal that it’s an unfair advantage.”

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Rocha was one of two female wrestlers to forfeit their matches against Beggs at the regional tournament. He did wrestle Grand Prairie student Kailyn Clay and won the match with a pin.  Beggs now moves on to the state championships this weekend in Cypress. Rocha also moves on to the state championships as one of the top four finishers at regionals.

Beggs’ grandmother, Nancy Beggs, told the Morning News two different UIL rules force the student to compete with girls, though he’d rather wrestle boys.

The forfeits at the regional tournament equate to “bias, hatred and ignorance,” she told NBC DFW.

“Mack is under strict medication, administered by physicians,” Nancy Beggs told the Star-Telegram. “We gave UIL a copy of the medical records, and were told we are not doing anything wrong. This year we had more tests run and are still in compliance.”

Coaches for both Euless Trinity and Coppell declined to comment on the situation.

Coppell district spokeswoman Amanda McCune issued a statement Monday that pointed out it was “ultimately” Rocha’s decision to forfeit her match against Beggs.

“We are proud of our athlete for winning second place at the regional meet and look forward to her success as she competes at the state meet this coming weekend,” McCune wrote in an email to the Star-Telegram.