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Breaking: UFC 183's Anderson Silva tests positive for anabolic steroid and PED, Diaz fails for marijuana

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Jayne Kamin-Oncea-USA TODAY Sports

It's been a terrible start for Ultimate Fighting Championship (UFC) champions ... past and present.

First Light Heavyweight kingpin Jon Jones gets caught doing cocaine (read more details here). Now Middleweight legend, Anderson Silva, flunked an out-of-competition drug test ahead of his comeback fight against Nick Diaz at UFC 183, which took place inside MGM Grand Garden Arena in Las Vegas, Nevada.

Is not normal.

UFC.com breaks the bad news:

"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."

Drostanolone is an anabolic steroid that, according to Wiki, "has been used for bodybuilding, mainly in 'cutting cycles.'" In addition to this banned substance, Silva also had androsterone -- another performance-enhancing drug (PED) -- in his system, according to Ariel Helwani.

UFC 183 marked Silva's dramatic return to the Octagon from a fractured shin, which occurred during his rematch with Middleweight champion Chris Weidman in Dec. 2013. He defeated Diaz via unanimous decision after five rounds of action (watch video highlights here), a result that will likely now be overturned to a "No Contest."

That's because, according to Kevin Iole of Yahoo!Sports.com, Diaz -- once again -- failed his post-fight drug test because of marijuana.

What a mess.