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 with her drug test a month prior to the competition. Another high-profile doping case involved the 2000 Olympic women's 100 m champion Marion Jones, though no doping infractions occurred during the Olympics. Having been one of the stars of the games—she won three gold and two bronze medals in track and field events—Jones was later implicated in doping through the BALCO scandal. She lied to federal agents and a grand jury during questioning around the scandal, but later admitted in 2007 to using Tetrahydrogestrinone (THG) during the period of her Olympic success. The IOC annulled all her Olympic results, including