Here's the beef wrote:
If USADA can trace the meat in Lawson's meal back to the supplier and confirm use of trenbolone(as it did with Wilson's zeranol positive) Lawson will be fine. If not, or if he doesnt have receipts USADA can follow, then he has a problem.
If you read the USADA statement on Wilson's case, you'll see that they do not say they traced the meat she ate. Instead, they relied on "independent experts" who reported on use of zeranol in general, not in this specific case.
"During its investigation into the circumstances that led to the positive test, USADA gathered evidence from Wilson, which included reviewing her dietary habits and food purchase receipts. USADA also took into consideration laboratory reports demonstrating low parts per billion concentrations of the prohibited substance in her urine, as well as the fact that she tested negative one week prior. USADA further relied on reports from multiple independent experts on zeranol in the food supply and environment, including the use of zeranol as a legal growth promotant in beef cattle in the U.S. Based on the totality of the evidence, USADA concluded it was highly unlikely that the presence of zeranol in Wilson’s sample resulted from a source other than zeranol contaminated meat."