fruit of the poisonous tree

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Definition

Noun: A legal doctrine stating that evidence derived from information or material that was obtained illegally (the "poisonous tree") is also inadmissible in court (the "fruit"). This secondary evidence is considered tainted by the initial illegality.

Usage

The term is used almost exclusively in legal contexts, particularly in criminal procedure, to describe and apply the exclusionary rule to indirect evidence.

Examples
  • The defense attorney argued that the seized drugs were the fruit of the poisonous tree because the police found them using a search warrant based on an illegal traffic stop.
  • The judge suppressed the confession, ruling it was the fruit of the poisonous tree as it resulted from an unlawful arrest.
  • Prosecutors cannot use evidence that is considered the fruit of the poisonous tree.
Advanced Usage
  • The doctrine is a cornerstone of the U.S. legal system's exclusionary rule, designed to deter police misconduct by removing the incentive to obtain evidence illegally.
  • There are established exceptions where the "fruit" may still be admissible, such as if it would have been inevitably discovered through legal means, if there was an independent source for it, or if the connection between the illegality and the evidence is sufficiently attenuated.
Variants and Related Words
  • Exclusionary Rule (n): The broader legal principle that prohibits the use of illegally obtained evidence in a trial. The "fruit of the poisonous tree" doctrine is an extension of this rule.
  • Tainted Evidence (n): A more general term for evidence obtained illegally or derived from illegal activity.
Synonyms
  • Derivative evidence
  • Tainted evidence
Notes

This is a metaphorical idiom from legal jargon. The "poisonous tree" represents the initial constitutional violation (e.g., an illegal search). Any evidence that grows from this tree—the "fruit"—is considered poisoned and cannot be used. It is a fixed phrase and is not typically broken down into separate phrasal verbs or other idioms.

Noun
  1. a rule that once primary evidence is determined to have been illegally obtained any secondary evidence following from it may also not be used