I think anyone who passes the test that is administered is clean until proven otherwise.
Lance failed so many test that they had to go and get testimony from several people that were close to him at these periods? Doesn't make sense.
It's Lance's actual admission that is damning him, not the test results, which begs the question: why have such ineffective tests if they still leave doubt afterward?
Luckily, it was Marquez's boxing brain that defeated a fighter that is pretty much superior to him in every other area, even if he did have some sort of drugs in his system.
Matter of fact, if he DIDN'T knock Pacquiao out with that punch...