Which case established that the exclusionary rule applies to the states?

Which case established that the exclusionary rule applies to the states?

• A. Weeks v. United States
• B. Mapp v. Ohio
• C. Wolf v. Colorado
• D. Silverthorne Lumber Co. v. United States

Answer: (B)

The key idea is applying a federal constitutional protection to the states through incorporation. The exclusionary rule, which bars evidence obtained in violation of the Fourth Amendment from being used in court, started in Weeks for federal courts. But Wolf v. Colorado held that this rule didn’t automatically apply to state courts. Mapp v. Ohio changed that by using the Fourteenth Amendment’s due process clause to incorporate the rule, so state and local prosecutions must also exclude illegally obtained evidence. This established a uniform remedy across the country and reinforced protection against unlawful searches at all levels of government. The earlier cases laid groundwork—Weeks for a federal rule, Wolf delaying incorporation, Silverthorne clarifying the reach of the rule and reinforcing how tainted evidence can’t be used—but Mapp is the one that ties the rule to the states.

The key idea is applying a federal constitutional protection to the states through incorporation. The exclusionary rule, which bars evidence obtained in violation of the Fourth Amendment from being used in court, started in Weeks for federal courts. But Wolf v. Colorado held that this rule didn’t automatically apply to state courts. Mapp v. Ohio changed that by using the Fourteenth Amendment’s due process clause to incorporate the rule, so state and local prosecutions must also exclude illegally obtained evidence. This established a uniform remedy across the country and reinforced protection against unlawful searches at all levels of government. The earlier cases laid groundwork—Weeks for a federal rule, Wolf delaying incorporation, Silverthorne clarifying the reach of the rule and reinforcing how tainted evidence can’t be used—but Mapp is the one that ties the rule to the states.