I heard an interesting interview on NPR with biostatitian Donald A. Berry. He argues that current drug tests for athletes have not passed scientific muster. Here is his article in Nature: The science of doping.
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 dont 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.