Mapp v. Ohio ended which legal doctrine?

The correct answer, B, refers to the Silver Platter Doctrine, which was effectively nullified by the ruling in Mapp v. Ohio. This case addressed the admissibility of evidence obtained in violation of the Fourth Amendment's protection against unreasonable searches and seizures. Prior to Mapp v. Ohio, the Silver Platter Doctrine allowed federal courts to accept evidence obtained by state officers who violated a person's constitutional rights, essentially allowing states to bypass federal protections.

The Supreme Court’s decision in Mapp v. Ohio established that the exclusionary rule, which prevents illegally obtained evidence from being used in court, is applicable to the states through the Fourteenth Amendment. This landmark ruling thus ended the practice of accepting such evidence under the Silver Platter Doctrine, reinforcing the importance of constitutional protections in all jurisdictions and ensuring that individuals have the right to a fair trial unimpaired by illegally obtained evidence.

Understanding this case is crucial for comprehending how constitutional rights are protected and the implications it has for law enforcement practices across the United States.