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Jurisprudence of the Exception

In 1984, the Supreme Court established the good-faith exception to the exclusionary rule in United States v. Leon and its companion case Massachusetts v. Sheppard. The Court reasoned that excluding evidence obtained through the police's good-faith reliance on a warrant issued by a neutral magistrate or judge that is later found to be deficient does not serve to deter any misconduct on the part of the police, and therefore such evidence is admissible. Said reasonableness of the reliance is determined under an objective standard. Furthermore, the Leon majority enumerated specific instances where the exception would not apply: