World 100m champion Kim Collins says he would be tempted to take performance-enhancing drugs to remain at the top of his sport.
"I can't say for sure that I wouldn't take drugs if I was losing. It's a possibility," the St Kitts & Nevis star told the Mail on Sunday newspaper.
Collins has also accused America of covering up positive drug tests.
He claims American athletes caught flaunting the drugs rules are "simply told not to do it again".
The favourite for Olympic gold in Athens also said he felt Britain's Dwain Chambers, banned following a positive test, has been unfairly treated "maybe because he is not American".
Collins said: "I don't know how it has been allowed to happen. The Americans have been involved in a lot of cover-ups.
"A lot of them have been caught but simply told not to do it again. Some of this comes out into the open and some of it does not.
"What has happened to Dwain is unfair. There is clearly prejudice towards him, maybe because he is not American.
"If there are rules, they must be applied to everyone. As they are not, then Dwain should still be allowed to run."