Caster Semenya has lost her landmark case against rules regulating testosterone in female athletes.
Semenya, a double Olympic champion who has dominated 800m running in the last decade, fought regulations imposed by the International Association of Athletics Federations (IAAF) which aimed to compel 'hyperandrogenic' athletes — or those with 'differences of sexual development' (DSD) — to lower their testosterone levels if they wished to compete as women.
The IAAF argued that the rules were essential to preserve a level playing field to ensure all female athletes can see 'a path to success'.