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UFC 137 drug test results come back clean for 'Penn vs Diaz' on Oct. 29 in Las Vegas

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UFC 137 drug test results are in from the Nevada State Athletic Commission (NSAC), who today confirmed that 17 fighters tested for illegal/banned substances after competing at UFC 137: "Penn vs. Diaz" on Oct. 29 have all passed with flying colors.

Main event participants B.J. Penn and Nick Diaz as well as Cheick Kongo, Roy Nelson, Scott Jorgensen, Hatsu Hioki, Donald Cerrone, Eliot Marshall, Brandon Vera, Chris Camozzi, Francis Carmont, Ramsey Nijem, Danny Downes, Bart Palaszewski, Tyson Griffin, Dustin Jacoby and Clifford Starks were all screened for performance enhancers such as steroids and drugs of abuse like cocaine and marijuana, among others.

Results from these battery of tests all returned negative.

The fighters mentioned above were randomly selected. However, athletic commissions typically test the main event participants and fight night winners, as well as those who have failed drug tests in the past.

"Penn vs. Diaz" featured former Strikeforce welterweight champion Nick Diaz staking his claim to a Super Bowl title shot against Georges St. Pierre by pounding on B.J. Penn for 15-minutes strong.

But that's not all.

Cheick Kongo maintained his status as the gatekeeper of the heavyweight division by outperforming Matt Mitrione in the co-main event of the evening.

Mirko Filipovic went out on a low note, retiring from active competition after getting clobbered by Roy Nelson while Scott Jorgensen stymied the return of Jeff Curran.

But don't take my word for it.

Complete UFC 137: "Penn vs. Diaz" results, commentary and updates are all right here.