The Beijing Games will be the cleanest Olympics in years despite concerns about the effectiveness of tests for blood doping, President of the World Anti-Doping Agency (WADA), John Fahey, said on Wednesday.

Though Fahey refused to guarantee a completely drug-free Games, he said cheats are more likely to be caught by the doping agency this year than ever before.

"One has to recognise the question of doping in sport has been around now for a long time," Fahey told Australian Broadcasting Corporation (ABC) Radio.

"There's been evidence that at successive games it's occurred. (But) I can give this guarantee: there's a far greater likelihood that anybody cheating or attempting to cheat in the Beijing Games will be caught than in any other time of our history."

WADA was established in 1999 after the previous year's Tour de France was rocked by the Festina affair, which exposed systematic blood doping within the sport.

(Xinhua News Agency July 24, 2008)