MPOETC Act 120 Practice Exam 2025 – Complete Test Prep Guide

The exclusionary rule was established in the case of Mapp v. Ohio, which was decided by the United States Supreme Court in 1961. This landmark decision held that evidence obtained in violation of the Fourth Amendment, which protects against unreasonable searches and seizures, cannot be used in state courts. The case arose when police forcibly entered Dollree Mapp's home without a warrant and discovered illegal materials. Mapp challenged the admissibility of the evidence, and the Supreme Court ruled that the exclusionary rule, which had previously applied only to federal courts, was applicable to state courts as well. This case reinforced individuals' rights and emphasized the importance of following constitutional procedures in law enforcement. By establishing the exclusionary rule, Mapp v. Ohio aimed to deter police misconduct and uphold the integrity of the judicial system by preventing the use of evidence obtained through unlawful means.