how head injuries have delivered a blow to pro-football

Aired: 10/8/2013 | 0:07:39 | Clip
The Frontline documentary "League of Denial" takes a look at the concussion crisis in pro- football and what scientists know about link between repetitive head trauma and brain injury. Ray Suarez talks to Mark Fainaru-Wada of ESPN, an investigative reporter and co-author of the accompanying book by the same name.

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