This rule landmarked the Supreme Court’s position on protecting an individual’s Constitutional rights through times when state courts allowed abuse of law enforcement power in criminal investigations. At this time though, the Exclusionary rule only applied to federal courts. This changed because of the Wolf v. People of the State of Colorado case. Julius A. Wolf claimed that his Fourth Amendment rights were violated at his state trial because the state court allowed evidence obtained illegally to be used in his trial. Despite this claim, the Supreme Court ruled in favor of the State of Colorado and decided “although the Fourth Amendment applied to the states, the states were not required to exclude evidence obtained unlawfully” since the Exclusionary Rule applied to the federal law enforcements abusing their power (Great American Court Cases 369). In 1961, however, the Supreme Court reversed its original decision in 1949 and made a final decision in 1961 that “the Exclusionary Rule . . . applies to states as well as the federal government;” because of the Mapp v. Ohio case.(Great American Court Cases 373) The police suspected