Yahoo Sports reports: The U.S. drug czar portrayed a menu of changes to anti-doping protocols being proposed by a World Anti-Doping Agency panel as moves that would “undermine the trustworthiness of the performances of competitors" at future Olympics. Sara Carter, the director of the Office of National Drug Control Policy, sent an open letter Monday to WADA and its stakeholders. It comes a day before an “extraordinary meeting” of the WADA executive committee at which it will discuss recommendations from a “working group” put together in the wake of a doping case involving Chinese swimmers.