Moving between the NFL trenches, America’s research labs and the boardrooms where the NFL went to war against science, League of Denial examines how the league used its power and resources to attack independent scientists and elevate its own flawed research - a campaign with echoes of Big Tobacco’s fight to deny the connection between smoking and lung cancer.

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Don't miss FRONTLINE's companion documentary, beginning October 8 on PBS

The National Football League, a multibillion-dollar commercial juggernaut, presides over America’s indisputable national pastime. But the NFL is under assault: thousands of former players and a host of scientists have claimed the league tried to cover up how football inflicted long-term brain injuries on many players. What did the NFL know, and when did it know it? In a special two-hour investigation, FRONTLINE and prize-winning journalists Mark Fainaru-Wada and Steve Fainaru of ESPN reveal the hidden story of the NFL and brain injuries, drawn from their forthcoming book, League of Denial. Learn more at