Other cases

Jessica Hardy

The American swimmer tested positive during the United States Olympic trials in 2008 and received a one-year ban. The World Anti-Doping Agency (WADA) tried to extend the ban to two years, but lost in the Court of Arbitration for Sport (CAS). Hardy blames a tainted nutritional supplement.

Josephine Onyia

The Nigerian-born Spanish athlete won gold in the 100 metres hurdles at the 2008 world championships, yet tested positive for both clenbuterol methylhexaneamine. The Spanish federation initially cleared her, but WADA challenged it at the CAS, which handed down a two-year ban.

Li Fuyu

The Chinese cyclist for Team RadioShack is serving a two-year ban after testing positive in a control in Belgium in April last year. Li also claimed tainted meat.

Dimitrij Ovtcharov

The Ukrainian-born German table tennis player tested positive in September 2010 after a trip to China. He later provided hair samples. German and international table tennis officials dropped the case and WADA did not challenge it to CAS.

Alessandro Colo

The Italian cyclist tested positive during the 2010 Vuelta a Mexico. Despite evidence of possible food contamination, the Italian anti-doping agency gave him a one-year ban, citing rules that outline 'strict liability' of what's found inside an athlete's system.

Philip Nielsen

The Danish cyclist also tested positive during the 2010 Tour of Mexico and was acquitted by a Danish sports tribunal. This month, WADA withdrew its appeal before CAS.