This unique conference brought together leading jurists, scholars, prosecutors, defense lawyers and social scientists to explore prosecutors' use of informants and defendants who cooperate with the government to obtain benefits. What are the moral, ethical and practical implications of our current models? How extensive is the problem of lying to prosecutors? What can lawyers learn from social scientists about maximizing witness truth telling? Is there a way for institutions to effectively sensitize and train prosecutors to insure that witnesses are not shading testimony to curry favor? Are there workable proposals for systemic change that will decrease the dangers associated with cooperating witnesses?