I haven't been following the Landis thing very closely so I was kinda
surprised to learn that the standards for a positive test depend on the lab
doing the testing. From yesterday's on-line chat with Michael Hiltzik at
<http://www.latimes.com/sports/cycling/la-sp-landischat7mar07,1,6347094,full.story?coll=la-headlines-sports>
:
"Landis asserts, and I've confirmed this, that the positivity criteria for
CIRMS at Paris and UCLA are different. Keeping in mind that testosterone
breaks down in the body into four metabolites, which can be measured and
their ratios compared to a control group of "clean" subjects (sorry for the
technical mumbo-jumbo), UCLA measures two of these ratios and requires that
both be positive to declare an athlete guilty. Paris measures all four and
requires any one to be positive to declare guilt. These are radically
different approaches. [...] Australia, I believe, also checks two
metabolites and requires both to be positive."