Recently retired light heavyweight Stephan Bonnar has been suspended for one year due to his positive drug test at UFC 153.

Sherdog.com confirmed the development Tuesday with Marc Ratner, UFC vice president of regulatory affairs.

Bonnar was flagged for drostanolone, an anabolic steroid, following his Oct. 13 appearance at HSBC Arena in Rio de Janeiro. Bonnar, 35, headlined the event opposite longtime middleweight championAnderson Silva, who finished “The American Psycho” via first-round technical knockout to close the evening’s pay-per-view broadcast.

Should Bonnar decide to cut his retirement short, the American may fight in the UFC no earlier than Oct. 13, 2013.

Heavyweight competitor Dave Herman also failed his UFC 153 post-fight drug test. Herman was flagged for marijuana metabolites and was defeated by returning veteran Antonio Rodrigo Nogueira, who submitted Herman with an armbar late in the second round.

While MMA is regulated in the United States by individual state athletic commissions, Brazil still lacks a governing body to perform those duties. As such, the UFC has served as its own regulator in its recent trips to Brazil, including UFC 153. Ratner told Sherdog that Herman’s suspension was to-be-determined and that neither Herman nor Bonnar has been fined. According to a statement recently released on UFC.com, both fighters have admitted to taking banned substances and have agreed to suspensions.

The Ultimate Fighting Championship(UFC) may have tied a ribbon on its  UFC 148 pay-per-view (PPV) event from the MGM Grand Garden Arena last Saturday night (July 7, 2012) in Las Vegas, Nevada, but the fight between Anderson Silva Vs Chael Sonnen is far from over.

Sonnen, who was on the wrong end of a second round technical knockout (TKO) stoppage, planned to file an appeal against his loss to “The Spider” with the Nevada State Athletic Commission (NSAC), claiming Silva’s crushing knee intended to strike the head of a downed opponent.

And part of it did, causing Chael to receive eight stitches in his mouth, according to longtime mixed martial arts (MMA) reporter Jonathan Snowden, who today (July 9)  tweeted news of the appeal while rubbing elbows with the cast and crew of The MMA Hour Show with Mauro Ranallo.

In addition, Sonnen’s trainer, Scott McQuarry,told snowden his student deserves a rematch:

“We’re going to ask for a rematch. We deserve a rematch. If the only way Anderson Silva can win is by cheating, we need to keep a closer eye on Silva before and during a fight. And we need a rematch now. Legal knee or illegal knee, there’s enough doubt with all the fouls to warrant a rematch.”

The appeal, which was eventually  abandoned to pursue a rematch from the UFC brass, comes in stark contrast to Sonnen’s post-fight comments, who not only  admitted to joining his Brazilian nemesis in a clothing tug-of-war, but also  downplayed the intentions of the knee that signaled the beginning of the end to his championship rematch:

“Yeah, Anderson grabbed my trunks but I grabbed his right back. It goes both ways. We can’t sit and nit pick some of that stuff. It’s a two man sport. It’s kind of like moving the chains in football, it evens itself out. What goes around comes around. Anderson grabbed my shorts tonight, I’ll grab someone else’s shorts down the road.”

On the knee on the ground:

“You know, I don’t make those decisions and I hate those rules anyway. You know, I’m an old school guy before we had rounds and weight classes and all that stuff. We’re in a lot better spot now, I don’t propose we should go back to that but I don’t care about legal or illegal. I could see him, I could see it coming. That’s just the way it goes.”

Whether or not Team Sonnen can create enough of an uproar to get the UFC to consider a rematch remains to be seen.