Caster Semanya takes the IAAF to Court

South Africa's 800 meters Olympic champion Caster Semenya (C) and her lawyer Gregory Nott (R) leave after a landmark hearing at the Court of Arbitration for Sport (CAS), in Lausanne, on February 18, 2019. - Semenya will challenge a proposed rule by IAAF aiming to restrict testosterone levels in female runners. (Photo by Harold CUNNINGHAM / AFP)