Even before a race has been run, a series of recent doping scandals has already begun to overshadow next month's world track championships.
Two of Usain Bolt's main rivals in the 100 metres - Jamaican teammate Asafa Powell and American sprinter Tyson Gay - have failed doping tests in recent weeks. Sherone Simpson, another Jamaican, is also among the recent positives.
But Sebastian Coe, a two-time Olympic gold medallist in the 1500 and a vice president of the IAAF, says the competition is bigger than any individual athlete.
Coe says "the message that should eminate from the last few weeks, is that the IAAF (and others) take the abuse of drugs in sport very, very seriously."
The worlds start August 10 and run for nine days.
Bolt is still expected to be there, but Powell and Gay won't be.
"The message is very clear: If you choose to cheat, the technology is there and the will within the IAAF and within the international federations and the national governing bodies is there to make sure that our sport is clean and is competed all with integrity," Coe said.
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