UFC 183

181 - A month subsequent to the event, on January 7, 2015, it was revealed that Ashlee Evans-Smith had failed her post-fight drug test
182 - On January 6, it was announced that Jones failed a drug test prior to the event. He tested positive for benzoylecgonine, the primary metabolite of cocaine

183 - On February 3, it was announced that both fighters involved in the main event failed drug tests. Anderson Silva failed a pre-fight test administered by the Nevada State Athletic Commission on January 9. The results came in on the day of the announcement and revealed Silva tested positive for drostanolone metabolites, which is an anabolic steroid. Silva also had traces of androsterone, a form of endogenous testosterone and also another banned substance. Silva was also tested on January 19 and on the night of the event, passing the latter test, while the results of the Jan. 19 tests are still pending. Further testing will be conducted by the Commission to confirm these preliminary results.[9] On the other hand, Nick Diaz had an amount of marijuana metabolites over the allowable limit in his post-fight test. This is the third time that Diaz has tested positive to marijuana.[10]
 
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