Former Ultimate Fighting Championship light heavyweight champion Tito Ortiz questioned the legacy of Anderson Silva after the former middleweight champion tested positive for banned substances.

Following his victory in his comeback fight at UFC 183 against Nick Diaz, Silva, who is considered by many as the greatest UFC fighter of all time, tested positive for drostanolone and androstane in pre-fight and post-fight tests, which sent shockwaves to millions of mixed martial arts fans.

Ortiz admitted that he was one of the millions of MMA personalities surprised by the failed drug test. When asked if he is now doubting Silva's legacy, Ortiz admitted said there is now a serious question mark in previous victories of the former UFC middleweight champion.

"Of course, without question, I question it a little bit," Ortiz said via Bloody Elbow. "It's bad all around; bad for him, bad for the sport, and bad for the UFC. You've got to put reprimands on guys like that – make them pay for it."

Silva has denied any knowledge of using steroids intentionally before the fight. But despite the denial from "The Spider" and his camp, Ortiz said that he cannot help but question why Silva would use performance-enhancing drugs. Ortiz is also unsure if Silva would have won the fight against Diaz if he was clean on fight night.

"It made me scratch my head a couple of times like 'Anderson, how can you do that?' I'm a huge fan of Anderson," Ortiz added. "I'm a huge fan of Anderson. That was too bad. I don't know what kind of thoughts he's getting from his training partners or from his trainers. Things like that, you shouldn't do them."

Silva recently said that they are looking at medications he took before the fight, which was his first appearance inside the Octagon since sustaining a gruesome leg injury during his rematch with Chris Weidman in December 2013.

Late last week, UFC lightweight champion came into the defense of Silva before his fight against Rafael Dos Anjos at UFC 185. Pettis said that he does not believe Silva will willingly take banned substance to get an advantage.

"I just can't see him consenting to cheating," Pettis told MMA Fighting. "I don't think that's something he would do. I mean, when you're at that high of a level, people want to see you back, there's money to be made if he fights again, so somebody had to be in his ear or somebody had to be giving him stuff that he didn't know what it was."

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