Report: Jones passes polygraph taken to prove he didn't knowingly use steroid

Another wrinkle has been added to Jon Jones' second doping case.

The former light heavyweight champion took a polygraph test in an attempt to prove he didn't knowingly take any performance-enhancing substances prior to his UFC 214 rematch with Daniel Cormier, and he passed, sources told MMA Fighting's Ariel Helwani.

The USADA announced in late August that Jones had failed a drug test in July before he recaptured the divisional crown with a third-round TKO of Cormier in Anaheim. The "B" sample, collected the day before the fight, tested positive for the steroid Turinabol.

Jones reportedly took the polygraph test at a polygraph and interviewing service on Dec. 7. He wasn't asked to do so by the UFC or USADA.

The 30-year-old was eventually stripped of the strap and saw his victory overturned to a no-contest by the California State Athletic Commission once his sample tested positive. Jones has since denied he knowingly took the banned substance, and his team attributes the violation to a tainted supplement. As a repeat offender under the USADA's anti-doping policy, he could be suspended for up to four years.

His hearing with the CSAC is set for February. Sports attorneys Lucas Middlebrook and Erik Magraken have deemed the polygraph's findings inadmissible and a "PR stunt," respectively.

Jones first violated the USADA's anti-doping policy in July 2016, three days prior to an ill-fated rematch with Cormier at UFC 200. He tested positive for estrogen blockers and subsequently claimed they'd entered his system via a tainted sexual enhancement pill. The agency handed him a one-year ban that expired mere weeks before he faced Cormier at UFC 214.