Olympics | Five key questions over USADA's anti-doping practices

PARIS, Aug. 9 (Xinhua) -- International media reported on Wednesday that the United States Anti-Doping Agency (USADA) had exonerated athletes who tested positive for doping in exchange for them acting as "informants." The World Anti-Doping Agency (WADA) subsequently issued a statement criticizing this practice for its "contravention of World Anti-Doping Code".

This news quickly garnered widespread attention from