Riccardo Ricco, right, is led away before the start of the 12th stage of the Tour de France on Thursday between Lavelanet and Narbonne.

Narbonne, France ? With the competition reduced to an afterthought, the Tour de France was rocked by another drug bust Thursday that left cycling’s showpiece event all but synonymous with doping.

This was the third time in this race that a rider has been caught, and it netted the biggest name yet: Italy’s Riccardo Ricco, a winner of two stages.

“You can’t believe that a wave of a magic wand can change the world of cycling,” Patrice Clerc, head of Tour organizer ASO, told a news conference. “It’s going to take time.”

Ricco was expelled from the race and detained by police to the boos of fans. His Saunier Duval team pulled out of the Tour and suspended all its activities. This is the third straight year the Tour has been undercut by doping.

The day’s 12th stage was won by Mark Cavendish of Britain while Cadel Evans of Australia retained the yellow jersey. But, as is often the case in cycling, drugs overshadowed all.

“May the cheaters get caught. May they go away,” Tour president Christian Prudhomme said. “I said to the riders before the race, behind closed doors, that you have the key. … Some didn’t get the message.”

Evans welcomed the drugs busts, and “that the sport is being cleaned up in a serious, fair and transparent way. Our sport is being crucified for doing the right thing.”

As the stage got under way, Evans rode alongside the car of the Tour director, and said: “Rest assured, we’re on the road toward a clean sport,” Prudhomme told The Associated Press.

All three riders were ousted for the performance enhancer EPO – cycling’s drug of choice. Ricco tested positive after the fourth stage, a time trial in Cholet.

“It’s just amazing. It’s irresponsible,” said David Millar, a British rider with the Garmin-Chipotle team.