A former Olympic champion who had admitted to doping killed himself and reigning Beijing Games winners were disgraced by doping scandals in 2010.

Former Olympic sprinter Antonio Pettigrew was found dead in the back seat of his locked car in August and police announced the 42-year-old committed suicide.

The assistant track coach at the University of North Carolina admitted to doping in 2008 and was stripped of the gold medal in the men's 4x400m relay in 2000 Sydney Games.

He said then that he wanted "to play a role in teaching people, especially young athletes, to know that the negatives far, far outweigh the benefits these substances may give you."

No one knows that how much the American's repentance and revelation would work for the youth but as International Olympic Committee president Jacques Rogge put it, "Doping will never completely disappear from sport because cheating is inevitably a human nature. Our duty is to reduce to as low as possible."

One of the ways to hinder drug cheats is doping tests in which several renowned athletes were found positive for banned substances.

American 400m Olympic champion LaShawn Merritt received a 21-month ban for anabolic steroid dehydroepiandrosterone (DHEA) which he claimed was contained in an over-the-counter product to enlarge his private part while world and Olympic 100-meter champion Shelly-Ann Fraser of Jamaica was suspended for six months after failing a doping test. She said she took a painkiller because of a toothache before her Diamond League race in May in Shanghai.

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