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Associated Press
FILE - This March 13, 2012 file photo shows  WBA and IBF light welterweight champion Lamont Peterson, left, of the United States, and British Boxer Amir Khan, posing following a news conference in London. A Nevada regulator says Peterson failed a drug test, and a May 19 rematch in Las Vegas against former title holder Khan is in doubt. (AP Photo/Brynjar Gauti, FIle)

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