Landis tested as having abnormal testosterone to epitestoterone ratios
Now any use of outside testosterone would be banned, but the tests for this are tricky and it is a naturally occuring substance in the body. Though I haven't read all of the defense I believe that there are some arguments for suspect testing procedures in there. The mass spectrometer (sp?) test that proved the T was not natural sounds like a fairly hard one to counter though.
I think you may be remembering a Lance Armstrong test - it was for a very low level of a steroid, under the threshold for a positive doping test (as this is also a substance that naturally occurs in the body) and was also explained by possible contamination by a legal topical saddle sore cream.
The test for homologous blood doping is also tricky and actually quite subjective, so lets wait for the testing of the B sample (and Vinokurov himself has requested B sample testing) before we make any condemnations.





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