The exclusionary rule is a legal principle that prevents evidence obtained through illegal or unconstitutional means from being admitted in a court of law. It is a rule established by the Fourth Amendment of the United States Constitution and applies primarily in the criminal justice system. The aim of the exclusionary rule is to deter law enforcement officers from conducting unreasonable searches and seizures in violation of an individual's Fourth Amendment rights. If evidence is obtained in violation of these rights, it is considered "fruit of the poisonous tree" and is generally suppressed or excluded from being used as evidence in court.
