** FILE ** Terry Madden, CEO of the United States Anti-Doping Agency, pauses during testimony before the Senate Subcommittee on Commerce, Science and Transportation in Washington, in this Oct. 28, 2003 file photo. Madden will step down as leader of the U.S. Anti-Doping Agency, ending a seven-year stint running the country's main line of defense against doping in sports. In a news release announcing the decision Wednesday March 7, 2007, USADA said Madden will be replaced by USADA general counsel Travis Tygart on Oct. 1. (AP Photo/Evan Vucci)