Over the past day or two, Sports Illustrated magazine has released a story accusing two Jamaican hurdlers of receiving illegal performance-enhancing drugs, and Ukrainian heptathlete Lyudmila Blonska's Olympic silver medal has been withdrawn after results of a positive drugs test were announced.

At the Olympics, a variety of competitors, ranging from a Spanish cyclist, to a Vietnamese gymnast, to North Korean shooters, failed drugs tests.

And on the eve of the Olympics, nine Russians - seven middle-distance stars and two walkers - failed tests.