EXPLAINER: What exactly are track's testosterone rules?

Elaine Thompson-Herah, left, of Jamaica, wins the final of the women's 200-meters from Christine Mboma, of Namibia, at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo. (AP Photo/David J. Phillip)

Christine Mboma, of Namibia, celebrates with Beatrice Masilingi, of Namibia after winning the silver medal in the final of the women's 200-meter at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)

Beatrice Masilingi, of Namibia, compete in a semifinal of the women's 200-meters at the 2020 Summer Olympics, Monday, Aug. 2, 2021, in Tokyo. (AP Photo/Petr David Josek)

Christine Mboma, of Namibia, celebrates after her second place finish in the final of the women's 200-meters at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo. (AP Photo/Petr David Josek)

Christine Mboma, of Namibia, reacts after her second place finish in the final of the women's 200-meters at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo. (AP Photo/Petr David Josek)

Elaine Thompson-Herah, left, of Jamaica, crosses the fish line ahead of Christine Mboma, centre, of Namibia, and Gabrielle Thomas, of United States, to win the final of the women's 200-meters at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo. (AP Photo/David J. Phillip)

Elaine Thompson-Herah, of Jamaica, the gold medal winner celebrates after the final of the women's 200-meter with Christine Mboma, of Namibia, silver, and Gabrielle Thomas, of United States, bronze, at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

Anthonique Strachan, of Bahamas and Beatrice Masilingi, of Namibia compete in a women's 200-meter semifinal at the 2020 Summer Olympics, Monday, Aug. 2, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)