Escarabajo said:
MI, I think you are going a little overboard. Just set a minimum threshold, so nobody tests positive.
Yes, it's an over the top response to an over the top situation. The brute fact is that there is no way to set a minimum threshold that can separate doping from contaminated meat with any reliability. The threshold should certainly be lower than 300 pg/ml, but if it is, then that guy Nielsen doesn't get off. A 50 pg/ml value seems very reasonable, but even if one thinks Bert was innocent, his case shows very clearly that a value that low can result from doping. That is true even if one tests negative before and after the positive, as Bert did, and much more likely if one doesn't have before and after tests, as is usually going to be the case.
A salient fact, to me, is that CB is commonly used for weight loss, IOW, future rather than current performance enhancement. This means that many riders will be using it out of competition rather than during even a prolonged race like a GT. We all agree that if Bert is guilty, he used it in this manner, and I think this is probably the case for many other riders. But that being the case, they are always going to test at very low levels during competition. A minimum threshold means that they can usually get away with taking it in this manner.
We do know for sure that if one does not eat contaminated meat, or some contaminated supplement, one is not going to test at levels above, say, 5-10 pg/ml. So if the rule is directed at this problem, it should be possible to nail riders in a way that minimizes false positives.