The most sensitive and dangerous of all these efforts to penetrate a criminal enterprise comes when investigators attempt to insert one of their own into the group. Undercover employees can provide extraordinary insights into the working of an enterprise, and they can also steer conversations in order to obtain recorded statements on particular events. They are even able to alter the activities of a group to prevent acts of violence. During a trial, undercover employees provide powerful testimony. They offer both the access of an enterprise member and the credibility of a law-enforcement
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