"Mayweather’s “A” sample had tested positive on three occasions and, after each positive test, USADA had found exceptional circumstances in the form of inadvertent use and gave Floyd a waiver. This waiver, according to the rumor, negated the need for a test of Floyd’s “B” sample. And because the “B” sample was never tested, a loophole in USADA’s contract with Mayweather and Golden Boy allowed the testing to proceed without the positive “A” sample results being reported to Mayweather’s opponent or the Nevada State Athletic Commission (which had jurisdiction over the fights)." - David Hauser