Some notable local and international dope cases

1988:

Sprinter Ben Johnson tested positive for stanozolol, an anabolic steroid, at the Seoul Olympics and was banned for two years. The Canadian was stripped of his 100m gold medal and 9.79sec world record. He tested positive for a banned substance for a second time in 1993 and was banned for life.

1996:

Singapore's Jojo Sinclair was banned for life, after testing positive for stanozolol in 1993.

2003:

British sprinter Dwain Chambers was banned for two years after testing positive for the designer steroid tetrahydrogestrinone (THG).

2006:

Floyd Landis tested positive for abnormally high testosterone levels during stage 17, when he began a remarkable comeback in the Alps to win the Tour de France. He is awaiting his Court of Arbitration for Sport appeal that could reverse a decision to strip him of his title and ban him for two years. At the same time, in Operation Puerto in Spain, Dr Eufemiano Fuentes was accused of injecting some 200 professional athletes with banned substances.

2007:

Five-time Olympic athletics gold medallist Marion Jones admitted to having taken steroids before the 2000 Sydney Games. The American also acknowledged that she had lied about steroid use to federal agents and, for that and perjury in a cheque fraud case, she is serving a six-month jail term.