Olympic Doping Scandals: Past and Present

A team of about 1,000 people working in a laboratory in London are processing athletes' blood and urine samples to test for doping. Luiza Galiulina, Uzbekistan's only gymnast competing in the 2012 Olympics, was expelled from the Games after her "B" sample tested positive for the banned substance fuorsemide, the International Olympic Committee announced on Aug. 1. (Saeed Khan/AFP/Getty Images)