"Like with any drug test, if the B-sample comes back negative, then that trumps the A-sample, and he'd be eligible for licensure immediately," he said. "But if it comes back positive, or if he doesn't ask for it to be tested, that's something that can be used for grounds for denial. But that will be up to the commissioners."
Kizer said that the issue will remain in place until whatever point Overeem attempts to gain a license, even if it's years from now.
No retroactive penalty is likely. Though Overeem was given a conditional fighter's license to face Brock Lesnar late last year under terms that he would later provide two random tests, failing one of those random tests months later is not likely to change the fight result, Kizer said.
According to him, Overeem passed three urine tests and one blood test around the Lesnar fight, and his samples from that time have likely been destroyed since.