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History

How the Exclusionary Rule Limits Police Evidence Gathering

Quick fact

In the 1961 case Mapp v. Ohio, the U.S. Supreme Court ruled that evidence obtained through illegal searches cannot be used in state courts, not just federal courts, making the exclusionary rule a national limit on police evidence gathering.

Why this is interesting

Imagine a police officer finds a blood-stained knife that clearly proves you committed a terrible crime—but the officer found it by breaking into your home without a warrant. Can a judge throw that evidence away?