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When did Lance Armstrong admit to blood doping? 

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These insights provide the foundation for future studies on the endocrinology of exercise metabolism, and suggest that Lance Armstrong's athletic advantage was not due to drug use.
The conclusion is that blood doping, properly performed, works in the laboratory, but there is insufficient evidence to show conclusively that it works in the field.
Tests for detecting artificial blood also exist, but it seems it will take widespread, year-round, unannounced, out-of-competition testing and stern penalties to deter blood doping.
Thirdly, if applied to a population of athletes, an extension of the model makes it possible to estimate the prevalence of blood doping for reasonably large populations of athletes.

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