Tampa Bay Buccaneers running back Doug Martin is entering rehab after failing a recent drug test. He is also suspended four games as a result. Martin was benched for the Bucs game last Saturday against the New Orleans Saints. The benching was classified as a "coaches decision." Last year, Martin was second in the NFL in rushing with over 1,400 yards and was a Pro Bowler. This year, Martin has struggled to get going after being slowed down by injuries.