HE world's fastest man, Asafa Powell, is convinced he will race against drug cheats at the Beijing Olympics.

The Jamaican has refused to name those he suspects but is adamant anyone caught testing positive should be banned for life.

"I have a lot of suspicions but I keep them to myself," Powell said ahead of Thursday's grand prix series at Olympic Park.

"It's always going to be there, that dark cloud, because people are wondering who is really on drugs.

"It's a very unfair sport. I get my satisfaction from beating whoever I think is on it.

"They should be banned for...