From Sherdog:

According to California State Athletic Commission Executive Officer George Dodd, Chael Sonnen has been notified that he failed post-fight drug screening following his loss to Anderson Silva at UFC 117, which was held Aug. 7 at the Oracle Arena in Oakland, Calif.

“[Sonnen] received his notice yesterday,” Dodd told Sherdog.com shortly after the Shane Mosley-Sergio Mora boxing match ended Saturday night in Los Angeles.

In a conversation the day before, Dodd declined to comment on the situation, other than answering that all fighters from UFC 117 had passed drugs-of-abuse scans, but that the commission was still waiting on performance-enhancing drug screens from the event.

Initial thoughts, obviously, are of disappointment. Just recently at a Fan Q&A for the UFC UFN 22 event, Sonnen mentioned his working with grappling coach Neil Melanson and many were looking forward to a rematch with champion Anderson Silva after winning so many fans over for his gutsy performance. Chael was also at a Billy Robinson seminar earlier in the year at Xtreme Couture.

I’m not going to fall into the trap of commentating on the situation until the story fully develops, especially as the CSAC hasn’t been without its own internal controversies, but it doesn’t look good.

Update:

Former Sonnen opponent Nate Marquardt has heard a rumour that Sonnen was on flu medication, and that could have been the cause of a positive result.

From Marquardt’s Twitter account:

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