UCI source confirms exogenous testosterone in Landis' A sample

The New York Times edition of Tuesday, August 1 has published information which substantiates previous reports in French L'Equipe newspaper, according to which exogenous, synthetic testosterone was found in Floyd Landis' A sample of July 20. A source "within the UCI anti-doping department, with knowledge of the result" Landis' probe returned, said in an interview that some of the testosterone in his body had come from an external source and was not produced by his system.

The Isotope Ratio Mass Spectrometry test (IRMS), which differentiates between natural and synthetic testosterone, was done after Landis' ratio of testosterone/epitestosterone was found to be more than twice what is allowed under World Anti-Doping Agency rules, the person said.

Landis' personal doctor, Dr. Brent Kay of Temecula, California, told the New York Times he hoped that the results of the test and of the initial T/E test were false positives. He did, however, confirm rumours that the initial test found a ratio of 11/1 in Landis's system. He and Landis are seeking an explanation for that high level.

The result of Landis' B sample is expected to be known before the week-end.