Alberto Contador
In 2006 his team had some trouble. A doctor in Spain had given drugs to athletes to help them to win. Some cyclists on Contador's team had worked with the doctor. The police wanted to check to see if Contador had taken drugs. As a result, Contador could not enter the 2006 Tour de France. Later the police decided that Contador had not taken drugs from the doctor. The case about the doctor was called the Operación Puerto doping case, and caused many problems in cycling.