The head of the U.S. Anti-Doping Agency (USADA), Travis Tygart, takes an oath prior to answering questions before a senate-led inquiry into the fight against doping in Paris, France, Thursday, April 25, 2013. The hearings are aimed at looking into ways of improving the fight against doping. USADA'S report produced a scathing report detailing systematic doping by Lance Armstrong and his teams, which led to Armstrong being stripped of his seven Tour titles and banned from elite sport for life. (AP Photo/Francois Mori)