without having undergone surgery and hormonal therapy, as a result of the 2003 Stockholm consensus ruling by the IOC. Race Olympic 100 m medallists in the early phase of the Modern Olympic Games were principally white, Western sprinters of European descent, largely reflecting the euro-centric make up of the nations that took part and the ideological environment of racial segregation at the time. As the Olympic competition began to attract wider international participation, athletes with African heritage began to reach and eventually dominate the 100 m Olympic podium, particularly African-Americans and Afro-Caribbeans. Eddie Tolan became the first non-white winner of the event in 1932 and this signified the start of a prolonged period of success by black male sprinters; since 1932 only five men's Olympic champions in the event have not had significant African heritage. The women's event was dominated by runners of European descent until Wilma Rudolph won the title in 1960. Soviet and German women returned to the podium in the period from 1972 to 1980, but since then African-American and Jamaican women have won the great majority of 100 m medals. Dominance in the men's event has been particularly pronounced from 1984 to 2016, during which time in a span of almost 40 years all the men's Olympic 100 m finalists have been of African heritage. In the 2020 Olympics, Chinese sprinter Su Bingtian ran 9.83 in his semi-final heat and became the first athlete without African heritage to reach the final since 1980 within the span of 40 years, setting an unofficial fastest 60 metres split record en route. 9.83 is also the second fastest semi-final time and made him the fifth fastest man in the history of 100 metres at the Olympics behind Usain Bolt, Yohan Blake, Justin Gatlin and Marcel Jacobs. Most commentators attribute this statistical discrepancy to genetic rather than to cultural factors. Doping All athletes who participate in the Olympic 100 m competition are subject to the World Anti-Doping Code –the IAAF and International Olympic Committee (IOC) are both signatories. Mandatory in-competition drug testing was introduced at the 1968 Summer Olympics. One of the most prominent cases of doping at the Olympics, and in sport as a whole, occurred during the 1988 Seoul Olympics. Ben Johnson entered the race as the reigning 100 metres world record holder and won the Olympic final, raising his arm in victory, in a new world record