jewbacca wrote:
It was spelled out right in the CAS ruling. Things can get less clear when dealing with wild boar, but not domestic. The testing can very easily, and in this case did, detect the difference between oral nandrolone and domestic pork.
Her defense 100% relied on the idea that wild boar somehow found its way into a food truck in Beaverton, Oregon. CAS laughed her out of court.
The CAS ruling mentions its right to consider probabilities. They determined, correctly, that the likelihood of Shelby doping was vastly more probable that her defense was valid. The testing proved an exogenous source of nandrolone, and she failed to provide a plausible way of how it got there.
Shelby's expert witness contradicts that. Soy feed would lead to lower IRMS values:
from page 38
Carbon isotope signatures are not unique and that they may vary depending on various
causes including diet. With regard to the diet of the pigs, one must take account of the
near-ubiquitous presence of soy meal within pig feed. Soy is a C-3 plant with a much
lower (i.e., more depleted) carbon isotope signature than corn. While corn is a dominant
component in cattle feed, soy is – according to her – the dominant protein-bearing
component in pig feed. Even if only 10% of a pig’s diet comes from soy, she opines
that this could still have a significant effect on an individual’s carbon isotope signature.
Based on her research, the soy-based diet may result in a carbon isotope signature
ranging from -25.0 to -24.5, after being fed this soy-based diet. All edible components
analyzed upon butchering of the adult pigs and sows (i.e., collagen, muscle, liver,
plasma [blood]) showed carbon isotope values between -21 and -25 again, directly
contradicting the claim that “typical” values of a pork meal are “around -18 / -20” as
well as the claim that a value of -23 must be “unusually depleted”. She is convinced
that a pork-meat meal, be it standardly derived from muscle tissue or non-standardly
derived from offal, may not only possibly exhibit a carbon isotope value between -21
and -25 in humans, but in fact is most likely to do so.
The test cannot determine the difference between some preparations of oral nandrolone and domestic pork. The IRMS values for domestic pork are too variable depending on feed composition.
I don't think Shelby's case was enough to get her off, but you are making it seem more clear cut than it is.