The US Anti-Doping Agency announced Tuesday that reigning 100-meter Olympic champion Justin Gatlin has been suspended for four years for a 2006 doping violation. The 25-year-old, who captured gold at the 2004 Athens Games, tested positive for testosterone at the Kansas Relays on April 2006. He was initially suspended for eight years but appealed the ban and hoped to have it reduced to just two years in order to be eligible for the 2008 Olympics in August. A three-member arbitration panel voted 2-1 to reduce the punishment to four years. Gatlin must also forfeit all results after the positive tests.