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THACKERVILLE, Okla.

Baltimore Ravens safety Tom Zbikowski failed a drug test following his latest foray in the boxing ring, the Chicago Sun-Times reported Tuesday.

Zbikowski, 25, reportedly tested positive for marijuana along with five other participants in Saturday's boxing card at the WinStar World Casino in Thackerville, Okla.

The former Notre Dame standout has been suspended 45 days by the Chickasaw Nation Boxing Commission pending the results of a second test.

Zbikowski's manager, Mike Joyce, told the Sun-Times the Ravens' safety would undergo a second test later Tuesday and he was confident the results would be negative.

"We're appealing it," Joyce told the Sun-Times. "After the fight, all the fighters tested were positive. They had you pee in a cup and put a strip of something in there. I've never seen results where you get them the day of the fight. It was like a home pregnancy test or something."

"He's taken all sorts of tests for the NFL and he's never tested positive ... ever," Joyce added.

Zbikowski wasted little time Saturday improving his professional boxing record to 4-0 with a first-round technical knockout of Blake Warner. The Ravens safety needed just two minutes and 20 seconds before the referee halted the fight after Warner left himself open to a right uppercut following an onslaught to the body.

Zbikowski, who is a restricted free agent, has been able to box because the NFL lockout has prohibited him from completing a new contract with the Ravens. The safety-turned-pugilist is reportedly looking to sign a deal that would allow him to continue his offseason pursuits in the ring.