facts please wrote:
OK. Seems to me that you are pointing to widespread official corruption of the antidoping process. Which I agree is a problem. I think it is a different problem than what you posted in your original claim of athletes getting off because of a technicality and a slip-up by the lab or testers. Those seem like two different issues to me, but maybe they are the same to you. The only slip-up I can think of off the top of my head is the handling of the Lagat sample, but I am sure there are others.
Lagat is a good example of a high-profile athlete.
Another one is Marion Jones; she had an EPO positive in 2006 that was not confirmed by the "B" sample. She denied using EPO (no surprises there) and wasn't charged with a doping offense at that time. However, she got implicated in the infamous BALCO scandal and later admitted to doping. And at her sentencing hearing for the perjury charge, the court documents showed that she had used EPO, human growth hormone and THG.
http://www.espn.com/olympics/trackandfield/news/story?id=2576909An interesting case in cycling is a situation where a World Pro Tour rider tested positive for EPO and the "B" sample also was not confirmed but yet he was still found guilty of a doping offense and given a 4 yr ban. Apparently, there is a rule that allows governing bodies to throw out the results of an inconclusive "B" sample and simply reference the results of the "A" sample.
https://www.velonews.com/2018/07/news/cardoso-epo-case-highlights-inequalities-in-anti-doping-process_471394