With recent controversies surrounding the eligibility of athletes with disorders of sex development and hyperandrogenism, as well as continued discussion of the conditions transgender athletes must meet to compete in high-performance sport, a wide array of scholars representing a diverse range of disciplines have weighed in on both the appropriateness of classifying athletes into the female and male categories and the best practices of doing so. In response to cases of high-profile athletes’ sex being called into question, the International Olympic (...) Committee, the International Association of Athletics Federations, and the National Collegiate Athletics Association, among others, published or updated policies addressing who is eligible to compete in the women’s sport category and under what conditions. This paper addresses the areas in which philosophical reasoning and ethical analysis can contribute to reopened debates about the surveillance of the women’s category in sport. Emphasis is placed on determining where the onus of responsibility should fall for ensuring the new policies are followed. (shrink)