UFC 129 drug test results come back clean for 'St. Pierre vs Shields' on April 30

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UFC 129 drug test results are in from UFC Vice President of Regulatory Affairs Marc Ratner (via CagePotato.com), who confirmed that all fighters tested for illegal/banned substances after competing at UFC 129: "St. Pierre vs. Shields" on April 30 have all passed with flying colors.

Because the Ontario Athletic Commission decided to pass off drug testing for the event, UFC took matters into its own hands.

The fighters competing on the card that were tested 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 came back negative.

The fighters that were tested were randomly selected. However, athletic commissions (or in this case the UFC) typically test the main event participants and fight night winners, as well as those who have failed drug tests in the past.

UFC 129 featured a main event pitting Welterweight Champion Georges St. Pierre putting his strap -- and legacy -- on the line against top contender Jake Shields.

"Rush" was forced to battle through a banged up eye but found a way to persevere and take home the unanimous decision win.

Also on the card was a featherweight title fight pitting champion Jose Aldo against unrelenting challenger Mark Hominick. "Scarface" was sluggish but dominant, defeating "The Machine" after five rounds of action.

Finally, Lyoto Machida dislodged Randy Couture's dentures with a Karate Kid front kick knockout that sent "The Natural" into retirement ... this time, likely for good.

For complete UFC 129 results and blow-by-blow coverage of the main card action click here and here.

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