Supreme Court Explorer
Mapp v. Ohio
367 U.S. 643
Holding / constitutional rule
Applied the exclusionary rule to the states for evidence obtained through unconstitutional searches and seizures.
Why it matters
A major incorporation and criminal-procedure case connecting Fourth Amendment protections to state policing.
Connected Research
Government research source
Constitution Annotated / CRS search →
The holding and significance above are concise editorial summaries, not quotations from the opinion. Follow the government source to review constitutional analysis and underlying case authorities.