test. Initially, Dana White announced that Silva would remain on the show as a coach. Subsequently, Silva was pulled as one of the coaches and was replaced by Antônio Rodrigo Nogueira. In his first fight post-injury, Silva faced Nick Diaz in the main event of UFC 183 on 31 January 2015. He won the fight via unanimous decision. In the days after the fight, it was revealed that Silva tested positive for Drostanolone and Androstane, two anabolic steroids, in pre-fight drug screening on 9 January 2015. Nevada State Athletic Commission chairman Francisco Aguilar confirmed that the fight has not yet been overturned and can't be until a motion is passed by a majority of the commission. Any penalties, suspensions or changes to the outcome of the fight have to be presented as a motion and then voted on by the commission to enact the order. On 11 February 2015, it was reported that Silva tested positive for an additional unknown illegal substance in a separate test that was related to UFC 183. On 17 February 2015, NSAC executive director Bob Bennett confirmed to ESPN.com that Silva failed his postfight urine test and that Silva had tested positive for the steroid Drostanolone—the same banned substance he tested positive for during an out-of-competition test taken on 9 January 2015. Silva also tested positive for the anti-anxiety medication Oxazepam and Temazepam, which is used to treat sleep deprivation. On 13 August, after several reschedules, the disciplinary hearing was held to decide on the subject. Silva's defense argued that a tainted sexual enhancement drug that a friend had given to Silva after a trip to Thailand was the root of the two failed tests for drostanolone and also appealed to mistakes in the NSAC testing procedures, pointing to a pair of drug tests, one on 19 January and one after the fight, which Silva passed. He admitted to using both benzodiazepines the night prior to the fight as therapy to control stress and help him sleep. Silva's team was unable to explain the presence of androsterone in 9 January test. The commission rejected the defense and suspended him for one year retroactive to the date of the fight, as the current guidelines were not in effect at the time of the failed tests. He was also fined his full win bonus, as well as 30% of his show money, totaling $380,000. His victory was