Walker never preaches, she and Kos just lay out an incredible journey with a few supportive side trips to
build her case against extreme sports while still celebrating the athletes who participate in them.
The U.S. Anti-Doping Agency (USADA)-- not part of WADA — for instance,
built a 2004 doping
case against sprinter Michelle Collins in part on indirect evidence, including years of urine tests that showed «
extreme fluctuations» in her testosterone levels.