The Court of Arbitration for Sport has decided that female athletes with atypically high levels of testosterone must take testosterone-lowering medication in order to compete in certain events. I'm troubled by the precedent this sets.

If virtuous perfection of natural talents is what sports is all about, sports needs more people like Caster Semenya, the South African runner. But she is now ineligible for competing in middle distance events unless she takes medication to suppress her naturally high testosterone levels. Is this fair?