Ben Jhonson is one of the most famous cases of doping in sporting history.
A new case has happened in Spain recently. The sportman is Alberto Contador, who has won many times in different seasons. He`s the most famous cyclist in this sport.
Although he defends his innocent, the sporting comission says that he´s taken a banned substance named clembuterol. Alberto has told on tv news that he`s not a cheat and is living an unfair situation.
There are many banned subtances like EPO or steroids.
The EPO increase the red blood cells and the oxygen making the body and its muscles more powerfull. The sportpeople takes this substance in log-term sports like cyclist and athletics.
The steroids make the muscles stronger and fatter. This substance is used in some sports like weight lifting.