Antonio Pierce discusses why an NFL protocol to protect players from taking banned substances wouldn’t necessarily be effective.
Colts LB Mathis Regrets Decision, Accepts Ban
Indianapolis Colts outside linebacker Robert Mathis waits for the start of a drill during practice at the NFL team's football training camp Monday, Aug. 5, 2013, in Anderson, Ind. Mathis will accept an NFL ban for taking a banned substance.AP Photo/Darron Cummings
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