(Reuters) – The global and U.S. anti-doping agencies are at odds over undercover tactics used by the American body to try to catch drug cheats, Reuters has learned.

The World Anti-Doping Agency (WADA) says U.S. agency USADA broke the global code by letting several athletes it had caught between 2011 and 2014 violating drugs rules go undercover and keep on competing without prosecution in exchange for information on other violators. (Read More)