Perhaps he should have told the testing agency to expect to find this substance. Only it didn't show up in the first test. A more plausible scenario if his promoter is telling the truth -- and it's kind of hard to believe he has absolute knowledge that Povetkin hasn't taken this substance since September since he hasn't had him within eyesight for every waking moment for 8 months -- is that there would have been, say, 10 nanograms in the first test and 9 in the second and 8 in the third and 7 in the fourth. Instead, he went from 0 to 7 in one test after three clean tests. That's damning. If someone can link scientific literature that says this substance is known to not be detectable for three tests and then show up on a fourth test two weeks after the third, I'd love to see it.