Bookies, pimps, and drug traffickers, for example, all keep records of their dealings, explained Dan Olson, chief of CRRU, which is part of the FBI Laboratory. “If there is money and credit involved in a transaction,” Olson said, “there has to be an accounting of that at every step of the way, even if it's on a match pack, hotel stationary, or the back of a cocktail napkin.”
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