For about 7 years he was the most recognized name in cycling, with hundreds of reporters and cameras following him during the cycling season.
During the Tour de France, there's a rule where the yellow jersey wearer (the overall leader), and the day's stage winner, as well as one rider chosen randomly, are tested.
So, the 40+ times in 7 years that Lance wore the yellow jersey, he was tested during the Tour.
He's the most tested rider in cycling history, and yet not a single positive result.
As I said, when would he have been able to do it? During any cycling event, there's always people following him and his team around. The cameras are always on them. If he was doping, it would have easily been caught by now. There would be photographic evidence.
There is none. All this is just wishful thinking. Mainly by the idiot European press who hate that an American could dominate the sport for so long. Especially the French, who haven't even won their own event since Greg LeMond was forced to give up his own Tour win chances and help Bernard Hinault back in 1985.