Oh, my fault. I don't have any medical or administrative knowledge that would actually answer questions as to whether or not that sort of thing would be readily apparent, as I am unsure of how they test for excess testosterone in the blood. Some organizations simply compare testosterone levels to the average, which I tend to think is a poor methodology given that you are dealing with world-class athletes in their fields and they do not often cleave to Average Joe's metabolism, testosterone levels, oxygenation rates, etc, etc. I do know enough, however, to say that a single shot of testosterone will not enhance athletic performance in the space of a single day - Landis would be better off taking PCP.

I will plead the other bit to common sense, though: if you were filling yourself with someone else's red blood cells in a high-level professional sport, it stands to reason that you would be well aware of the contents of said fluid before you go giving yourself an armful. This is the same reason I never believe any athlete when they say they must have taken steroids accidentally - at that level of performance, you know your intake of calories, vitamins, supplements, and everything else down to the milligram. That being a given, how would you accidentally shoot yourself full of blood that will wind up making you pop hot for testosterone?