Testimony and prepared statements examine the rule's costs and benefits to society. Issues considered include the effects of the rule on law enforcement efforts and police misconduct, the extent to which suppression motions lead to the dismissal of cases against guilty defendants, and the nature of cases in which the rule is at issue. The rule's deterrence of police misconduct and enhancement of police concern for the constitutional rights of citizens is discussed, as are other purposes served by the rule. Alternative methods of enforcing fourth amendment rights and their effectiveness are considered. Also discussed are the costs and benefits of modifying the rule to allow for good faith, reasonable mistakes of law and fact. Finally, whether the exclusionary rule is a proper subject for legislation, or whether it is a constitutionally mandated rule to be changed only by the courts or constitutional amendment, is considered. The majority of the testimony supports the exclusionary rule as a necessary protection against the invasion of privacy.