I have no axe against him, but there are many examples of riders who tested clean for a long time before eventually being caught or admitting it. Like it or not, the tests are not perfect; they are relatvely easy to fool and the doping/masking technology is far ahead of the testing technology. Not testing positive is not proof of not doping.
How did Lance fool a thousand tests? Tests which happen randomly, at any time. Yes a lot of people here have good points, but I think he would of tested positive at least once...he would of slipped, made some kind of miscalculation, etc. or hard evidence of doping material would of been found on him, in his car, etc. You say it's easy, but how do any of you know...you guys aren't tour riders that have to undergo as many tests as these guys do. That said maybe he did get away with it. I / we just don't know.