Doping

Head of US Anti-Doping calls it ‘stab in the back of clean athletes’

A decision on the case could come on Monday

Country’s exploits raise eyebrows, with concerns over lack of rigorous testing for doping

New Zealand long-distance runner tests positive for performance-enhancing erythropoietin

British boxer Benn tested positive for clomifene in leadup bout

Nigeria loses relay spot as AIU extend Okagbare’s ban to 11 years

Country’s Olympic Committee cheerful after CAS allows athlete to continue in Beijing

Colombian rider Nairo Quintana says no drugs were discovered during the investigation

Athlete Committee Sandford said the organisation would continue to pursue testing to ensure clean sport

Facility is barred from conducting any anti-doping tests for up to six months