Nobody knows nuthin'
Landis is entitled to be present when his "B" sample is tested, but he said he wasn't sure if he would avail himself of that privilege. Testosterone is considered among the trickier drugs for testers to pinpoint because it occurs naturally in the body. WADA requires that samples that possess greater than a 4:1 ratio of testosterone to epitestosterone be subject to further analysis, which includes the gathering of at least three additional urine samples to show that the high ratio is indicative of drug use. This step can only be bypassed if the sample was analyzed with what is known as the carbon-isotope ratio (CIR) test, a more expensive and complex testing procedure that can differentiate between natural and synthetic testosterone.
Landis said he did not know which testing methods were used. The simple ratio test alone has been subject to extensive criticism.
If Landis does know then the only reasonable explanation I can think of is that he is lying to create as much doubt about his guilt as possible. If he is telling the truth, however, and he doesn't know whether IRMS was used, then his guilt remains an open question. Why hasn't the information been released publically? I suspect it is because, for starters, no one in the world of journalism has put enough energy into the story to realize that this is THE question of the moment, and so journalists seem not to be asking. Also, there may be a regulation restricting how much these organizations like UCI and WADA can say. Again, I must be clear with you that I'm speculating here. I don't know.