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"League of Denial: The NFL's Concussion Crisis" preview

Preview: Season 32 Episode 2 | 2m 15s

The National Football League, a multibillion-dollar commercial juggernaut, presides over America’s indisputable national pastime. But the NFL is under assault as thousands of former players and a host of scientists claim the league has covered up how football inflicted long-term brain injuries on many players. FRONTLINE investigates: What did the NFL know, and when did it know it?

Aired: 10/07/13

Rating: NR

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