Designing Interrogations

Alessandro Ispano, CY Cergy Paris Université, CNRS, THEMA and Péter Vida, CY Cergy Paris Université, CNRS, THEMA and Corvinus University of Budapest

We provide a model of interrogations with two-sided asymmetric information. The suspect knows his status as guilty or innocent and the likely strength of the law enforcer’s evidence, which is informative about the suspect’s status and may also disprove lies. We compare prosecution errors in the equilibrium of the one-shot interrogation and in the optimal mechanism under full commitment. We describe a back-and-forth interrogation with disclosure of the evidence that implements the optimum in equilibrium without any commitment.