The welterweight fighter on Tuesday confirmed to MMAjunkie.com Radio (www.mmajunkie.com/radio) that he failed his second post-fight drug test for marijuana and has been released from the UFC.
Riddle flunked a test following UFC on Fuel TV 7, where he earned a split call against Che Mills (15-6 MMA, 2-2 UFC).
Several critics, including UFC President Dana White, said Riddle should have won a unanimous decision. White also disparaged Mills' performance, saying the fighter didn't press the action late in the fight when he had a positional advantage.
Mills was later cut by the promotion in a spate of pink slips handed out prior to UFC 157.
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