1. Case Identification
Case name: Mapp v. Ohio
Court: Supreme Court of the United States
Jurisdiction: Federal
Year: 1961
Citation: 367 U.S. 643
2. Claim Presented
The claim as characterized by the Court concerned whether evidence obtained by state law enforcement officers through a search and seizure conducted in violation of the Fourth Amendment could be admitted in a state criminal prosecution. The petitioner contended that the admission of such evidence violated rights secured by the Fourth Amendment as applied to the states through the Fourteenth Amendment’s Due Process Clause.
3. Authority Cited
Constitutional authorities:
Fourth Amendment to the United States Constitution (protection against unreasonable searches and seizures)
Fourteenth Amendment to the United States Constitution (Due Process Clause)
4. Court’s Analysis
The Court held that all evidence obtained by searches and seizures in violation of the Constitution is, by the same authority, inadmissible in a state court. The exclusionary rule, which prohibits the use of unconstitutionally obtained evidence in criminal prosecutions, was determined to be an essential part of both the Fourth and Fourteenth Amendments.
The Court overruled Wolf v. Colorado, 338 U.S. 25 (1949), to the extent that decision permitted the admission of evidence obtained in violation of the Fourth Amendment in state criminal proceedings. While Wolf had held that the Fourth Amendment’s protection against unreasonable searches and seizures was applicable to the states through the Due Process Clause of the Fourteenth Amendment, it had declined to impose the exclusionary rule as a constitutional requirement upon state courts.
The Court concluded that the exclusionary rule is of constitutional origin and applies with full force to proceedings in state courts through the Fourteenth Amendment. The rationale supporting this holding included: (1) the deterrence of unlawful police conduct by removing the incentive to disregard constitutional guarantees, and (2) the preservation of judicial integrity by ensuring that courts do not become participants in or beneficiaries of illegal conduct. The Court stated that “nothing can destroy a government more quickly than its failure to observe its own laws, or worse, its disregard of the charter of its own existence.”
The Court reasoned that the Fourth Amendment’s right to privacy had been declared enforceable against the states through the Due Process Clause in Wolf, but that the exclusionary rule was the only effective mechanism for enforcing that right. Without the exclusionary rule, the constitutional guarantee against unreasonable searches and seizures would be reduced to “a form of words.”
5. Disposition
Conviction reversed; evidence suppressed.
6. Procedural Outcome
The judgment of the Supreme Court of Ohio was reversed, and the case was remanded for further proceedings not inconsistent with the Court’s opinion.
7. Archival Note
This entry documents the judicial record in Mapp v. Ohio as preserved in the official reports. The decision addressed the exclusionary rule and clarified its application to state criminal proceedings under the Constitution.