Marion Jones Admitted To Using Muscle Enhancers to Improve Her Performance.

One of the most decorated and well-known female track and field athletes, Jones admitted to steroid use in October 2007. Though steroid rumors dogged the athlete for years, Jones routinely denied any involvement with doping, even testifying before two grand juries that she had always been steroid-free.

Jones competed in her first Olympics in Sydney in 2000. Though she was aiming for five gold medals, Jones came home with three gold and two bronze, a feat that had never been achieved by a female athlete.

Following the Sydney games, doping allegations continued to   follow the Olympic star. For starters, her ex-husband C.J. Hunter had tested positive numerous times for steroid use. Then, when the BALCO scandal broke, Jones was again implicated as having been one of the many athletes to use “the Clear,” a steroid that at the time was undetectable through urine tests. Ironically, it was Jones’ coach Trevor Graham who first exposed BALCO by anonymously sending a used syringe containing Tetrahydrogestrinone (THG) to the United States Anti-Doping Agency.

In a 2004 interview, BALCO founder Victor Conte told 20/20 that he had personally given Jones five different types of performance enhancing drugs before, after, and during the Sydney Olympics. However, Jones had never failed a drug test using the testing procedures of the time, and there was insufficient evidence to bring charges against the athletes.

In October 2007, Jones admitted to lying to federal prosecutors investigating the BALCO affair. She was stripped of her five Olympic medals and sentenced to six months in prison and 200 hours of community service.