Citing various studies and articles from medical journals, the plaintiffs have set out to show there was a history of literature showing that multiple blows to the head can cause long-term damage, and that the NFL was aware of that connection. A complaint filed by Girardi's clients says the league's Mild Traumatic Brain Injury Committee, set up in 1994, was "part of the NFL's scheme to deceive Congress, the players and the public at large." Lewis' complaint says that the NFL's "disinformation campaign was spearheaded" by that panel.
On Wednesday, a Senate committee held a hearing about whether manufacturers of sports equipment make misleading safety claims. One key moment was a House hearing in October 2009, when lawmakers grilled NFL Commissioner Roger Goodell about the league's concussion policies and the connection between injuries on the playing field and later brain diseases; soon afterward, the league made several changes, including revamping its return-to-play guidelines and changing the co-chairmen of its committee on concussions.
"Congress has maybe a slightly different purpose for investigating than the family of an injured player has in filing a lawsuit, but it's all based on the same facts. One thing Congress and the plaintiffs share as a purpose is that these kinds of injuries be prevented in the future," said David Rosen, an attorney in one of the California-based injury cases against the NFL.
All told, the plaintiffs are seeking judgments in the millions of dollars, although specific amounts are not detailed in the court filings — and none of the lawyers interviewed would say exactly what is sought.
These disputes might take years to be resolved; no one on either side was willing to guess how long it could be.
And the NFL cases aren't the only ones related to football head injuries. At least two class-action suits, naming three former college football players as plaintiffs, were filed against the NCAA in federal court in Illinois.
Lewis' clients asked a California court to make the NFL and Riddell fund medical monitoring for players currently residing in that state. Instead of seeking compensation for injuries, that lawsuit seeks a program to test players over the years to see whether they wind up with medical problems that stem from concussions in their NFL days.
"It's been issued for communities that are exposed to a toxic chemical from a factory or hazardous waste dump. It's been used for people that have used an unsafe drug," said Lewis, whose firm also is involved in a suit against the NFL Players Association about benefits for retired players. "We think it makes sense here because we have an isolated population at an elevated risk. They're different from people like you or me because of the head impacts they received as a player."
If successful, Lewis said, cases could be pursued in other states that recognize medical monitoring as a remedy.
Similarly, Girardi said he expects to add plaintiffs who have what he termed "concussion syndrome."
"At the end of the day, if we're successful in the litigation, each player will be treated individually and hopefully get the compensation he's entitled to for the injuries that came about," said Girardi, who worked on the 1990s water pollution case that inspired the film "Erin Brockovich."
Asked what evidence he has that the NFL committed fraud, Girardi replied: "At this stage of the proceedings, we'd just as soon not turn over our hole cards."
"I will say this: We measured every word very carefully," he continued. "This wasn't a situation where we said the driver was drunk and going 100 mph and have no proof of it."
Said Karp, the lawyer for the NFL: "The league has done the right thing, and has been doing the right thing for many, many decades."
Associated Press news researcher Judy Ausuebel in New York contributed to this report.
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