The Warren Court examined every aspect of the criminal justice system between 1961-1969, using the 14th Amendment to apply constitutional protections to state courts. This "nationalized" Bill of Rights protections. Key cases addressed the right to legal counsel, searches, confessions, and treatment of juvenile criminals. The Court began revolutionizing criminal justice with Mapp v. Ohio, applying the 14th Amendment to state judicial systems and evaluating unreasonable search and seizure. Later cases like Terry v. Ohio, Miranda v. Arizona, and Brown v. Board of Education further established civil rights and liberties protections.