Right now it really looks like this is a False Positive. Nothing in Landis background would lead anyone to think he was anything but clean. There would be no benefit to him taking Testonterone or synthetic Epi for that stage. He was tested multiple times as yellow jersey leader (INCLUDING after STAGE 15 and 16) and showed no abnormal results.
I think the result was either 1. a bad test and the B test will be negative or 2. a combination of adrenaline high, Alcohol (He drank a beer immediately after the stage and before the test), and just his total level of physical fitness and exertion.
Even if the B comes back positive, Floyd will then have the endocrine test run to prove he is clean. As has been said, every rider who has challenged this test has been successful.
The sad thing is that even if the B test is negative, or if the endocrine test clears Floyd -- the leaker has accomplished exactly what they wanted. They have destroyed the celebration, and have created a doubt about Floyd -- just as they have done with Lance.
The International Olympic Committee has completely dropped this test from it's testing regimen because it is so inaccurate. They have gone to a straight test for the synthetic Epitestosterone.
This is conspiratorial and that's the domain of the left. Let's not go there.