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An ESPN "Outside the Lines" investigation, reported by Mark Fainaru-Wada and Steve Fainaru, provides new information on the hot-button concussion issue. It reveals how the NFL tracks, manages and describes head injuries. Jets RB Shonn Greene is me...

Three years after Congress pressured the NFL to overhaul its concussion program, the league effort remains marked by inconsistencies in how it tracks, treats and even describes serious head injuries.