just to clarify landis did not test postive for anabolic steroids. His test to epitest ratio was unnaturally high. Unnaturally high does not mean that he was doping, though it is certainly a possibility.
cycling is very competitive and doping of various kinds is common, many of which are still virtually undetectable.
IMO whether you take your blood out then re-infuse it or you "sleep and train at altitude" using hyperbaric technology- its a form of assistance. But then someone who has better genetics is also getting a "leg up" (and they dont have to draw blood or sleep in a pressure pod or whatever else)--- just an observation.
if you have a better trainer with a better training method (thats unknown to others, perhaps because of advance MRI scanning that allows the design of a program specifically for your tendon length/tension ratio) but gives you a big advantage.. is that cheating? you have access to a tool that makes you "better" than others, a tool that you alone have.. is this the same as doping.. perhaps not... but its still an advantage thats not necessarily "natural"
just some random thoughts on the matter....