Tyler Hamilton former pro-cyclist who blew whistle on doping

Tyler Hamilton was one of the world's top ranked pro-cyclists, racing for the US Postal Team alongside Lance Armstrong. He was also part of Armstrong's sophisticated and secret doping program, which enabled his record seven Tour de France victories. He was exiled from the sport after the 2004 Olympics when he tested positive for a banned substance, and was forced to return his gold medal. He maintained his innocence until 2010 when he gave evidence to a grand jury in the US about the culture of drug use within the US Postal Service team, encouraged and aided by team of doctors, managers and coaches. Tyler Hamilton published a memoir in 2012 called 'The Secret Race: Inside the Hidden World of the Tour de France: Doping, Cover-ups, and Winning at All Costs'.