That is something of which the courts should be acutely aware when they assess the credibility of witnesses.

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But defence lawyers may be able to undermine the credibility of witnesses who have an incentive to blame their former bosses, irrespective of the truth.

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Indeed, the closing argument is the only time an attorney is sanctioned to opine on the quality of the evidence and credibility of the witnesses.

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The case against Mr. Clemens and the credibility of the prosecution witnesses are expected to face sharp attacks from defense lawyers, led by Rusty Hardin.

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But the Supreme Court has undermined that idea over the years, most powerfully with its Daubert ruling in 1993, ordering judges to determine the credibility of scientific witnesses before they can even be allowed to provide evidence in civil lawsuits.

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The second question is: Can you dismiss the charges under this strong set of facts and circumstances without hearing and evaluating the credibility of the key witnesses?

CNN

Beverly Crosby, a retired elementary school principal, said her decision to find the studio liable was based on her doubts about the credibility of several defense witnesses, which included high-level ABC executives.

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He dismissed the credibility of a series of prosecution witnesses who had dealt with the counting, height and weight of the disputed cash deposits.

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Defence counsel attacked the credibility and reliability of these witnesses, saying that without their evidence there was no case.

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Fourth, a majority of the defense witnesses had all received some form of payment from Rajaratnam, thus cutting to their credibility.

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