Italian police raided the hotel where Jamaican sprinter Asafa Powell is staying, and seized a number of supplements. Powell says they were given to him by his physiotherapist, and that he hopes to clear his name.
As he and other athletes await further test results, ITV News has had exclusive access to one of the labs fighting against drug cheats.
ITV News Sports Editor Steve Scott reports:
As Tour de France leader Froome can attest, the shadow of a drug scandal can linger for years. Athletics must act to avoid this cancer.
Paul Boyle, manager of Asafa Powell and Sherone Simpson, has confirmed that both have left Italy. They are in the air now.
Adidas AG has suspended its contract with Tyson Gay after the former double world sprint champion failed an out-of-competition dope test.