The exclusionary rule prevents the use of illegally obtained evidence in trials in both federal and state courts.
The exclusionary rule is a judicial principle that prohibits the use of evidence in trial if it was obtained illegally, as stated in the Fourth Amendment. This rule applies to both federal and state courts. For example, in the 1961 Supreme Court case Mapp v. Ohio, it was decided that evidence obtained illegally cannot be used in state criminal trials.
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