Is the NFL covering up just how dangerous it is to play pro football? This "Frontline" program follows prize-winning ESPN journalists Steve Fainaru and Mark Fainaru-Wada as they prepare a controversial 2013 book and investigate the evidence linking early dementia, catastrophic brain damage, and other debilitating conditions witnessed among players to the (literally) hard-hitting nature of their activities on the field. 120 min. Widescreen (Enhanced); Soundtrack: English Dolby Digital stereo; Subtitles: English (SDH).