Nature magazine

But when an athlete tests positive, is he or she guilty of doping? Because of what I believe to be inherent flaws in the testing practices of doping laboratories, the answer, quite possibly, is no.

In my opinion, close scrutiny of quantitative evidence used in Landis's case show it to be non-informative. This says nothing about Landis's guilt or innocence. It rather reveals that the evidence and inferential procedures used to judge guilt in such cases don't address the question correctly. The situation in drug-testing labs worldwide must be remedied. Cheaters evade detection, innocents are falsely accused and sport is ultimately suffering.

The editorial

Nature believes that accepting 'legal limits' of specific metabolites without such rigorous verification goes against the foundational standards of modern science, and results in an arbitrary test for which the rate of false positives and false negatives can never be known. By leaving these rates unknown, and by not publishing and opening to broader scientific scrutiny the methods by which testing labs engage in study, it is Nature's view that the anti-doping authorities have fostered a sporting culture of suspicion, secrecy and fear.