That is to say, IF there was a transfusion then, yes, there'd be plasticizers in the blood... but I wouldn't state it the other way around.
I'm starting to change my opinion. From this NY Times article
http://www.nytimes.c..._r=3&ref=sports
The test to detect plasticizers from IV bags has been around for more than a year in antidoping, but is not yet validated for use, so an athlete could easily question its validity in court.
“Even without a validated test, it could be looked at in a case-by-case basis,” Francesco Botré, the chief of the World Anti-Doping Agency-accredited laboratory in Rome, said. “If someone has a very, very high level of plasticizers in the urine, it would be hard for that athlete to explain how that happened if not for doping. If the level is lower, it obviously would make it much harder, but it would still be possible to prove.”
(Btw, the comments from Kohl in that article make for interesting reading too)
The plasticizers test has been devised through some degree of sampling and research. You can see from
this study in August 2009 that 127 athletes were among those included in the sample group. The study concludes...
High concentrations of DEHP metabolites present in urine collected from athletes may suggest illegal blood transfusion and can be used as a qualitative screening measure for blood doping.
DEHP is a plasticizer found in IV bags.
I'm following another avenue at the moment, one I suggested earlier. That is, that Contador is caught in the middle of a WADA - UCI handbags session. It is
possible that Contador was targeted, perhaps by WADA. I've read (and I could find the link again if needed) that WADA were not happy with Contador's blood passport. There was no consensus opinion from 6 experts as to exactly what might be wrong, but they didn't like it. They were also not pleased with UCI not doing more about it. Then came the clenbuterol positive. I think UCI wanted to keep it quiet at first, investigate it a little more and perhaps giving Contador a chance to explain. (People have suggested 'brush it under the carpet' but I'm giving UCI a somewhat untypical benefit of the doubt here!) I think it's possible that WADA leaked the info to the German broadcaster just to lift the lid on it (I have no evidence of that whatsoever btw, just me pondering). Now, even if any of that is true, it's not a defence for Contador.
Another thought occurred to me, but I'm sure it's been taken into account, I believe Contador takes (daily?) medication for epilepsy.
Edit: darned editor, I couldn't embed the NY Ttimes article link!