Silva faced Mark Hunt on December 7, 2013 at UFC Fight Night 33 in the main event.  It was a back-and-forth affair that saw both men trade the advantage over five full rounds. The end result was a majority draw (48–47 Hunt, 47–47, and 47–47).  Post-fight, Dana White said the bout won Fight of the Night and, despite the draw result, both men would receive their win bonuses.  Silva forfeited his win money and $50,000 Fight of the Night bonus to Hunt after failing a post-fight test for elevated testosterone (he had been undergoing UFC-approved testosterone replacement therapy ). He was suspended for nine months, retroactive to the date of the fight. 
One drawback to Brennan’s study is that, unlike Kouri’s, there was evidence of attempted deception. Several people had to be excluded from the non-users’ group because they were either definitely on steroids (they failed the urine test), or probably on steroids (in the researchers’ words, they had “implausibly high muscularity and low body fat despite denial of AAS use”). However, even if a couple of users slipped in, they probably didn’t skew the data too much. The sample size for nonusers was big enough (131 people) that a few bad apples wouldn’t spoil the whole bunch, and the researchers were excluding suspiciously jacked people anyways, so if a few users did slip in, they apparently weren’t swole enough to raise any red flags.