Anderson Silva fails drug test conducted after UFC 183

Anderson Silva failed two drug tests in January, Nevada State Athletic Commission executive director Bob Bennett confirmed to ESPN.com Tuesday. Silva had

Anderson Silva failed two drug tests in January, Nevada State Athletic Commission executive director Bob Bennett confirmed to ESPN.com Tuesday. 

Silva had already failed an out-of-competition test administered on Jan. 9, but passed a test on Jan. 19. It was revealed Tuesday that he failed the post-fight urine test administered after his UFC 183 victory over Nick Diaz on Jan. 31. 

The Jan. 9 test was positive for drostanolone and androstane, a pair of steroids. The Jan. 31 test was positive for Oxazepam, an anti-anxiety drug, and Temazepam, which is used to treat insomnia. 

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After reports surfaced that he had failed the Jan. 9 test, Silva denied using performance-enhancing drugs. 

Silva, 39, defeated Diaz by unanimous decision. It was his first fight since he broke his tibia and fibula in a Dec. 2013 fight.

- Dan Gartland