(PHILADELPHIA) -- Less than three weeks before its 2013 draft, the National Football League is facing a legal battle that could put billions of dollars on the line.
A Philadelphia judge is set to decide whether more than 200 lawsuits filed on behalf of more than 4,300 former players should go to trial or be settled by arbitration.
The suits allege that the league "ignored, minimized, disputed, and actively suppressed" awareness of the link between concussions and chronic neurological disease.
"The NFL … was aware of the evidence and the risks associated with repetitive traumatic brain injuries virtually at the inception, but deliberately ignored and actively concealed the information from the plaintiffs and all others who participated in organized football at all levels," the plaintiffs claim.
U.S. District Judge Anita Brody is tasked with deciding whether the claims constitute a labor dispute, which according to the league's collective bargaining agreements would be settled by an arbitrator instead of a jury. The players argue the claims fall outside the agreements.
"Judge Brody has a tremendously difficult task in her hands, with billions of dollars at stake," said Paul Anderson, a Kansas City, Mo.-based attorney who founded NFLConcussionLitigation.com. "Her job is to follow the law, and law is, to an extent, a bit undecided so it could go either way."
The hearing comes almost a year after the suicide of former NFL linebacker Junior Seau and five months after linebacker Jovan Belcher fatally shot his girlfriend before turning the gun on himself.
An autopsy revealed Seau had signs of chronic traumatic encephalopathy, a brain disease tied to repetitive head trauma bearing similarities to Alzheimer's, Parkinson's and Lou Gehrig's disease as well as depression. Whether Belcher had CTE is unclear.
Of 85 athletes and veteran brains studied for signs of chronic traumatic encephalopathy at Boston University's Center for the Study of Traumatic Encephalopathy, 68 tested positive. Half belonged to former professional players.
But the NFL contends the research wasn't there when it formed the mild traumatic brain injuries committee, led by a rheumatologist, which concluded in a 2005 study that "there were no adverse effects" associated with returning to the game after a concussion as long as the player was cleared by a knowledgeable team physician – results that were "in sharp contrast to the recommendations in published guidelines and the standard of practice of most college and high school football team physicians," according to the study.
The players claim research linking blows to the head with neurological problems dates back to 1928, and say that by publishing data to the contrary, the NFL "produced industry-funded, biased, and falsified research" and "actively sought to suppress the findings of other members of the medical communities" with contradictory results.
"The players' lawyers are going to try to find out exactly what the NFL knew, when they knew it, and how they acted on the information," said Anderson. But they can only do so if Judge Brody allows the cases to go to trial, opening the door for "far-reaching discovery," according to Anderson.
If the lawsuits are allowed to go to trial, the NFL could be on the hook for the long-term medical care of its players, as well as damages that could rise into the billions, Anderson said.
Copyright 2013 ABC News Radio