The fruit of the poisonous tree doctrine is a legal principle that says that any evidence developed as the result of an illegal search or seizure may not be introduced at trial.

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The "fruit of the poisonous tree" doctrine is a legal metaphor in the United States used to describe evidence that is obtained illegally. If the source of the evidence (the "tree") is tainted, then anything gained (the "fruit") from it is tainted as well, and typically cannot be used in court.

The Fruit of the Poisonous Tree Doctrine Is a Legal