Why Is The Exclusionary Rule Important

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The Exclusionary Rule is an important constitutional principle of modern criminal procedure law in the United States. Generally, it prohibits the summary at criminal trial of any evidence seized or otherwise obtained in violation of the Fourth Amendment to the Constitution. Under the Exclusionary Rule, unsuitably obtained evidence that leads to the subsequent discovery of other incriminating evidence automatically invalidates or "poisons" the newly discovered derivative evidence in the same way that a poisonous tree taints the fruits growing on any of its branches.

While it stems from the Fourth Amendment, it is not actually enclosed anywhere within the text of the Constitution or its Amendments. In fact, it was judicially shaped more than a century after the Constitution was approved in 1789 and the Fourth Amendment
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During this period, the rules of evidence in criminal cases paralleled the focus of civil courts, in that they valued the truthfulness and reliability of evidence adequately to outweigh any constitutional violations essential merely in its procurement.

The fruit of the poisonous tree doctrine is a descendant of the Exclusionary Rule. The exclusionary rule orders that evidence found from an illegal arrest, unreasonable search, or powerful interrogation must be omitted from trial. In the fruit of the poisonous tree doctrine, evidence is also excluded from trial if it was gained through evidence exposed in an illegal arrest, irrational search, or coercive interrogation. Similar the exclusionary rule, the fruit of the poisonous tree doctrine was established primarily to prevent law enforcement from violating rights against unreasonable searches and
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