FILE - China's Dongpeng Shi competes in a heat of the 110m Hurdles at the World Athletics Championships in Daegu, South Korea, Sunday, Aug. 28, 2011. The governing body of track and field has acted against suspected systematic cheating in results from qualifying events for the Tokyo Olympics and age manipulation of athletes up to 20 years ago. Chinese athlete Shi Dongpeng was stripped of his silver medal in 110-meter hurdles at the 2002 world junior championships. Shi went on to compete at the 2008 and 2012 Olympics but did not reach either final in his event. (AP Photo/Anja Niedringhaus, File)