If Jones does go with a tainted supplement defense, he could have a case.
Oliver Catlin, the president and founder of the supplement-certifying company Banned Substances Control Group, said the Food and Drug Administration (FDA) has done very little testing on over-the-counter estrogen blocker supplements and very few of those products are certified. However, Catlin said, the supplement industry is rampant with contaminated products, either accidentally or intentionally. The anti-estrogen category is likely no different.
"There hasn't been a demonstration in the industry experience that Letrozol and clomiphene can show up as a contaminating substances," Catlin said. "From my experience, I believe that there very much is a significant possibility for anti-estrogen supplements to be contaminated with [banned] pharmaceutical anti-estrogens."
And the chance is even greater if Jones went to a place like GNC and picked up a supposed natural estrogen blocker, Catlin said. It's relatively common, he said, for products like that to be spiked with a banned substance that makes the supplement more effective.
"Really, you don't know that the supplement you're using or not is tested and that's the very point," he said. "Knowing there is a risk of anything, any supplement that is in a category that is banned in sport runs a potential risk of being contaminated with a pharmaceutical drug that's not on the label showing up in that product to make it work better. And that's across the board of categories — whether it's a natural testosterone booster, an aromatase inhibitor."