Isotope ratio mass spectrometry (IRMS) is figuring prominently in the Floyd Landis, winner of the Tour de France. Here’s an article on Testosterone and Doping Control and another on Detection of Epitestosterone Doping by Isotope Ratio Mass Spectrometry that have some details on the tests.
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A lively discussion of the topic is going on at the Corante Pipeline Blog.
A timely Mass Spectrometry Reviews “Early View” article: Mass spectrometry in sports drug testing: Structure characterization and analytical assays
Seems like a follow up of your post is welcome 2 months later 😉