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Although Earl Warren ascended to the Supreme Court in 1953, when we speak of the Warren Court's "revolution" in American criminal procedure we really mean the movement that got underway half-way through the Chief Justice's sixteen-year reign. It was the 1961 case of Mapp v. Ohio, overruling Wolf v. Colorado and holding that the state courts had to exclude illegally seized evidence as a matter of federal constitutional law, that is generally regarded as having launched the so-called criminal procedure revolution.