He said his policy is never to call as a witness a police officer who has lied in the past, but he said Lee would likely be an exception, because "a street cop doesn't have Dr. Lee's reputation" or his grounding in science.

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The government alleges Mr. Clemens lied when he testified to Congress in 2008 that he never took steroids or human growth hormone.

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"Never has a man, here or anywhere, been lied about so much, " he said.

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