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After spending time in rehab, Tyrann Mathieu is trying to convince NFL GMs that he's more than his old habits. Mathieu sits down with ESPN the Magazine to discuss his past and the upcoming draft.

Manny Acho of the Cleveland Browns is currently rehabbing from injury and Sam has recorded 24 tackles so far this season, averaging 3 sacks per game.

Researchers have developed technology that could detect and measure the impact of blows to the head in real time during a game, but the NFL has yet to use it.