Russian figure skating star tested positive for drugs months ago, but was allowed to compete at Olympics

Kamila Valieva is a teenage figure-skating star from Russia. It turns out she failed a drugs test in December—but officials decided not to disclose the results until she helped her team win gold in Beijing's Winter Olympics this week.

Valieva tested positive for trimetazidine, which is used in the prevention of angina attacks, but is on the banned list because it is classed as a cardiac metabolic modulator and has been proven to improve physical efficiency.