Silva’s positive result, for the steroid drostanolone, was from a pre-fight, out-of-competition test on Jan. 9. The UFC said in a statement that it was notified on Tuesday by the Nevada State Athletic Commission.
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Diaz tested positive for marijuana after a post-fight test. The UFC responded in a second statement later Tuesday:
The UFC said further testing will be conducted to confirm the results.
Silva won the middleweight bout on Jan. 31.
