source | Yahoo!®Sports
In a stunning development, both fighters who competed in the main event of UFC 183, Anderson Silva and Nick Diaz, failed their drug tests.
Silva, the legendary ex-UFC middleweight champion who is widely regarded as the greatest mixed martial arts fighter in history, tested positive for two anabolic steroids, drostanolone and androstane. For the third time in his career, Diaz had elevated levels of marijuana metabolites in his system.
Diaz tested above Nevada’s 150 ng/ML allowable limit for marijuana metabolites, meaning he’ll face discipline as a third-time offender. Diaz previously tested positive for marijuana after a Pride card in Las Vegas on Feb. 24, 2007, and after UFC 143 on Feb. 4, 2012.
UFC®.com also released a statement
source | UFC®.com
“On February 3, 2015, the UFC organization was notified by the Nevada State Athletic Commission that Anderson Silva tested positive for Drostanolone metabolites on his Jan. 9 out of competition drug test. UFC’s understanding is that further testing will be conducted by the Commission to confirm these preliminary results.
“Anderson Silva has been an amazing champion and a true ambassador of the sport of mixed martial arts and the UFC, in Brazil as well as around the world. UFC is disappointed to learn of these initial results.
“The UFC has a strict, consistent policy against the use of any illegal and/or performance enhancing drugs, stimulants or masking agents by its athletes.”