https://www.nytimes.com/2016/08/20/s...00-meters.html
When Semenya, then 18, dominated the 800 at the 2009 world track and field championships, winning by more than two seconds, a fellow competitor called her a man. Pierre Weiss, the general secretary of the International Association of Athletics Federations, track and field’s world governing body, said, “She is a woman, but maybe not 100 percent.”
....
Female athletes above the testosterone threshold of 10 nanomoles per liter — considered at the lower end of the male range — faced the prospect of invasive, humiliating and potentially risky measures if they wanted to continue competing. These included hormone-suppressing drugs and surgery to remove internal testes, which can produce testosterone.
It is not known for certain what, if any, procedures were undergone by Semenya, who won a silver medal at the 2012 London Olympics. Nor could it be verified, as reported in 2009 in The Daily Telegraph of Australia, that Semenya had internal testes and three times the testosterone level of a typical woman.