Fruit of the Poisonous Tree doctrine prevents the government from using illegally gathered evidence at a criminal trial.
where as there is another doctrine The exclusionary rule which says that illegally seized evidence can be introduced at trial, if the officials would have found the evidence anyway.
The term “fruits of the poisonous tree” was first used by Frankfurter, J. in Nardone v. United States wherein it was held that, in a prosecution in a federal court, evidence procured by tapping wires in violation of the Communications Act of 1934 is inadmissible.
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