100 metres at the Olympics 40 in 2000 and reached the Olympic semi-finals four years later. (Ottey is also the most frequent participant having competed in the Olympic 100 m an unrivalled six times from 1984 to 2004). The first women's champion, Betty Robinson in 1928, remains the youngest gold medallist for the event at 16 years old, while a 32-year-old Linford Christie became the oldest 100 m Olympic champion in 1992. Since introduction of testing by the IAAF in the early-20th century, female sprinters may be subject to gender verification. This rule was first formally applied to the 100 m at the 1968 Mexico
100 metres at the Olympics before and after his Olympic win, and returned to the podium at the 2012 Olympics. The men's runner-up in 2012, Yohan Blake, was banned for consuming a stimulant in 2009. On the women's side, the Olympic 100 m was affected by state-sponsored doping in East Germany. Stasi documents released after the fall of the Berlin Wall revealed extensive drug usage by Olympic sprinters, including the 1976 and 1980 silver medallists Renate Stecher and Marlies Göhr, as well as the 1988 bronze medallist Heike Drechsler. Shelly-Ann Fraser, twice Olympic champion, received a six-month ban in 2010 for taking a prohibited narcotic