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The exclusionary rule is a fundamental legal principle that prohibits the use of evidence that has been obtained in violation of a defendant's constitutional rights, particularly in criminal cases. This rule aims to deter law enforcement from using unlawful methods to gather evidence, such as violating the Fourth Amendment, which protects against unreasonable searches and seizures. By excluding evidence obtained through illegal means, the rule serves as a safeguard to ensure that the justice system operates fairly and abides by the law.

This principle reinforces the integrity of the judicial process, highlighting the importance of obtaining evidence in a lawful manner. When evidence is gathered in violation of constitutional rights, allowing it in court could undermine the legal system and lead to distrust among citizens. Hence, the exclusionary rule acts as a critical check against potential abuses of power by authorities.