Former UFC middleweight champion Anderson Silva tested positive for Drostanolone metabolites in a January 9 out-of-competition drug test before his UFC 183 comeback fight against Nick Diaz. Drostanolone is a common form of anabolic steroid. Silva defeated Diaz by unanimous decision on Saturday January 31 at UFC 183. This was the first fight for Silva since he broke his leg in a fight in December, 2013
Diaz tested positive for marijuana metabolites in a post-fight drug test. This is the third time Diaz has tested positive for marijuana in his career.
Both fighters could be facing fines or suspensions.
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