PHILADELPHIA (AP) — Thousands of retired Black professional football players, their families and supporters are demanding an end to the controversial use of “race-norming” to determine which players are eligible for payouts in the NFL’s $1 billion settlement of brain injury claims, a system experts say is discriminatory.

Former Washington running back Ken Jenkins, 60, and his wife Amy Lewis on Friday delivered 50,000 petitions demanding equal treatment for Black players to Senior U.S. District Judge Anita B. Brody in Philadelphia, who is overseeing the massive settlement. Former players who suffer dementia or other diagnoses can be eligible for a payout.

Under the settlement, however, the NFL has insisted on using a scoring algorithm on the dementia testing that assumes Black men start with lower cognitive skills. They must therefore score much lower than whites to show enough mental decline to win an award. The practice, which went unnoticed until 2018, has made it harder for Black former players to get awards.

“My reaction was, ‘Well, here we go again,'” said Jenkins, a former running back. “It’s the same old nonsense for Black folks, to have to deal with some insidious, convoluted deals that are being made.” Jenkins is now an insurance executive and is not experiencing any cognitive problems, but has plenty of NFL friends who are less fortunate.

In March, Brody threw out a civil rights lawsuit that claimed the practice is discriminatory. But she later said in a filing that the practice raised “a very important issue” and asked a magistrate judge to compile a report on the problem. She told The Associated Press she did not know when it would be completed.

Class counsel Chris Seeger, through his spokesman, has said he wants to end the practice of race-norming and investigate any awards that were affected by adjustments in the past.

“We are investigating whether any claims have been impacted by a physician’s decision to apply such an adjustment. If we discover an adjustment has been inappropriately applied, I will fight for the rights of Black players to have those claims rescored,” Seeger said.

NFL spokesman Brian McCarthy has declined to comment on the issue in the past, and did not immediately return an email seeking comment Friday.

The majority of the league’s 20,000 retirees are Black. And only a quarter of the more than 2,000 men who sought awards for early to moderate dementia have qualified under the testing program. Lawyers for Black players have asked for details on how the $800 million in settlement payouts so far have broken along racial lines, but have yet to receive them.

Race norming is sometimes used in medicine as a rough proxy for socioeconomic factors that can affect someone’s health. Experts in neurology said the way it’s used in the NFL settlement is too simplistic and restrictive, and has the effect of systematically discriminating against Black players.

“Because every Black retired NFL player has to perform lower on the test to qualify for an award than every white player. And that’s essentially systematic racism in determining these payouts,” said Katherine Possin, a neurology professor at the UCSF Memory and Aging Center.

In other major settlements, including those tied to the the Sept. 11, 2001, terrorist attacks and the Boston Marathon bombing, all claimants were treated the same.

“We concluded, fairly quickly, that we would take the top compensation for the white male and everyone would get the same, the top dollar,” said lawyer Ken Feinberg, who has overseen many of the largest settlement funds. “We would cure this compensatory discrimination by having a rising tide raise all ships.”

The first lawsuits accusing the NFL of hiding what it knew about the link between concussions and brain damage were filed in 2011. A trickle soon became a deluge, and the NFL, rather than risk a trial, agreed in 2013 to pay $765 million over 65 years for certain diagnoses, including Alzheimer’s disease and dementia. But as the claims poured in, Brody feared the fund would run out early and ordered the cap removed.

The NFL, which foots the bill, began challenging claims by the hundreds, according to the claims website.

In appealing one filed by Najeh Davenport, the NFL complained that his doctor had not used “full demographic norms” in the cognitive scoring. That meant factoring in age, education, gender — and race.

“I remain unsure what you are talking about. He was done using standard norms like everyone else. Using different racial standards is indeed discriminatory and illegal. We stand by our scores,” the physician said in response, according to court records.

Ultimately, the appeal was reviewed by a pair of University of Pennsylvania legal scholars serving as special masters for Brody. They rejected the original reviewer’s finding that race norms were mandatory under the settlement. Still, they concluded that Davenport’s doctor had to explain whether he typically uses them or only waived them so Davenport would get an award.