Anderson Silva's second out-of-competition drug test has come back clean.

Silva didn't have any banned substances in his system in tests taken Jan. 19. MMAFighting.com obtained the records from the Nevada Athletic Commission (NAC) on Monday. The UFC 183 headliner passed an HGH kit and a regular examination on that date.

Silva did test positive for anabolic steroid metabolites in a drug screening on or around Jan. 9. That news was broken by Yahoo! last week. The former UFC middleweight champion was found to have drostanolone and androstane in his system. Both substances are banned by the World Anti-Doping Agency (WADA) code followed by the commission. He is temporarily suspended and facing discipline from the NAC at a hearing in either March or April.

Bob Bennett, the NAC executive director, said he did not know if the latest test findings would affect any penalties given to Silva by the commission.

"I can't speak for the chairman or be presumptuous in any way or comment on that," Bennett told MMAFighting.com. "It's not my position."

Bennett did say it was good news for Silva, the UFC and the sport.

"We're happy to get these results," he said.

Dr. Ali Mohamadi, an endocrinologist, told MMAFighting.com last week that drostanolone can be detected in the system as long as two months after being taken.

Silva defeated Nick Diaz at UFC 183 on Jan. 31 by unanimous decision. That result could also be overturned at the disciplinary hearing.

Diaz tested positive for marijuana metabolites in a post-fight test and is also facing a penalty from the NAC. Bennett said that Diaz was not administered any random, out-of-competition tests prior to UFC 183. Diaz was only licensed to fight days before UFC 183 when he submitted a negative drug test to the commission.

Silva, 39, is the greatest champion in UFC history. He held the middleweight title for seven years and holds the organization records for most consecutive wins (16) and title defenses (10).