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Pewee fo oanat “tone of voice, timing of comments, and even the defendants’ trial where oral testimony can at best only partially re- create an event, the reliability of the Abscam evidence — was increased many times over. Not only was there no oor question of the actual words used by the participants, but the jury could also perceive the added dimensians of gestures and mannerisms. The issue of "credibility; determin-* ing whether the events occurred as the government contends, an issue that dominates so many criminal trials, was virtual- ly eliminated from these tridls. Thus, there is absent | . from the reliability calculus one of the major hazards. to truth and justice that is present when only oral testimony: © recreates the events. Finally, review of the tapes in each case confirms that the jury was not only authorized, but virtually compel- led to find each of the congressional’ defendants guilty. B. Specific Operation of Abscam. . - 1. Inadequate Safeguards. Defendants argue that Abscam was conducted "without - adequate safeguards", particularly with respect to the supervision of Weinberg. They point out that during the ‘more than one year of Abscam's operation, Weinberg was. accompanied by agents Amoroso or McCarthy only half the i t '