Last month at the French Embassy in Washington, DC, I participated in a day-long session on the regulation of female athletes, following the recent decision by the Court of Arbitration for Sport to uphold the IAAF regulations targeted at Caster Semenya and others. During the session, Stéphane Bermon of the IAAF and a chief architect of the regulations, relied heavily on a new literature review by Clark et al. 2019 in the journal Clinical Endocrinology – a group of scientists associated with the U.S. Anti-Doping Agency – to argue that testosterone levels between males and females do not overlap.
It turns out. Clark et al. 2019 is fatally flawed. I have been in touch with Clark et al. and the editor of the journal for the past six weeks. Read on for the details, which I am publicizing for the first time today.