Caster Semenya Loses IAAF Testosterone Legal Case

South Africa’s athletics star Caster Semenya has lost her appeal against rules designed to decrease naturally high testosterone levels in some female runners.

In a landmark judgment, the Court of Arbitration for Sport (CSA) says the IAAF’s proposed rules on athletes with “differences of sex development (DSD)” are discriminatory.

However, the judges ruled 2-1 that “on the basis of the evidence submitted by the parties, such discrimination is a necessary, reasonable and proportionate means of achieving the IAAF’s aim of preserving the integrity of female athletics in the Restricted Events.”

The IAAF believes female runners with high testosterone levels have an unfair advantage in events from 400m to the mile.

Semenya, a two-time Olympic champion in the 800m, will now be forced to medicate to suppress her testosterone levels if she wants to defend her world title in September in Doha, Qatar.