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History

The Evolution of the Exclusionary Rule in Criminal Procedure

Quick fact

In 1914, the U.S. Supreme Court created the exclusionary rule to ban evidence from illegal searches, but it only applied to federal agents—state police could still use such evidence for another 47 years until Mapp v. Ohio (1961) made it apply nationwide.

Why this is interesting

A single piece of evidence can make or break a case—but what if the police obtained it illegally? The Supreme Court created a rule to keep it out of court, yet its power has waxed and waned for over a century.