Lewis calls for tougher sanctions

Carl Lewis has called for unity between "governments, the public and athletes" in the fight against cheating - and suggested doping should be made a criminal offence.

American Olympic great Lewis, who won nine golds over four Games, is exasperated by the ongoing problem with banned substances as Tim Montgomery and Marion Jones have recently joined the list of athletes to have fallen foul of testers.

And Lewis told BBC Sport: "If people want a clean sport, we must bring together governments, the public and athletes."

"I would change the law - if you test positive, why can't it be illegal?"

Lewis rubbished the claim by Dwain Chambers, who was banned for using THG (tetrahydrogestrinone), that athletes need to resort to such measures to be able to compete with each other.

"The problem is that people choose to cheat," said the sprint and long jump great.

"Dwain Chambers didn't have talent. He had to take drugs, he had to cheat."

"I'm tired of these people that don't have talent, that take drugs and try to blame everybody."

"The reality is that most athletes are clean, most athletes do it right and good athletes don't take drugs. People who don't have talent take drugs."