"He had a pre-existing medical condition (involving an enlarged pituitary gland) that was consistent with the natural production of hCG in males," Steinberg said. "They came out in the hearing, and they were documented.
"We learned that he had a particular medical condition that was consistent with natural production in the body of this banned substance. We felt with the low levels at which it tested was also consistent with natural production."
h/t: Steph via Twitter