Also known as: fruit of an illegal search · fruits of the poisonous tree · fruit of the poisonous tree · fruit of the poisonous tree doctrine
Written by attorneys · grounded in primary & secondary sources — see below
Derivative evidence obtained through exploitation of an unconstitutional search or seizure. The doctrine extends the exclusionary rule to bar not only the primary evidence seized in violation of the Fourth Amendment but also any later evidence causally linked to that violation. Admissibility turns on whether the connection between the illegality and the evidence has become sufficiently attenuated or whether an independent source or inevitable discovery breaks the causal chain.
Agent Perez hacked Malik's home server without a warrant and obtained IP logs. Perez used those logs to secure warrants for NimbusCloud records. The emails seized under the warrants were suppressed because they flowed directly from the initial unlawful intrusion.
Investigators trespassed onto ChemTech's fenced property and installed a sampling device. They used only the resulting data to obtain warrants for corporate servers and records. The seized documents were excluded as derivative evidence from the initial unlawful entry.
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Officers relied on a warrant later found to rest on information from an earlier illegal search of Frederick Ferguson's residence. The evidence seized under that warrant was nevertheless admitted because the officers acted in objective good faith.
After an unlawful search of Felicia Fuentes's vehicle, officers located a weapon. The weapon was admitted because a separate, ongoing investigation would have inevitably uncovered it through lawful means.
Police conducted an illegal search of Fatima Flores's apartment and found documents implicating her associate Faye Fuller. Fuller moved to suppress the documents but lacked standing because she was not the victim of the misconduct.
Following an unlawful entry into Fusion Power's offices, an employee later volunteered server credentials during a voluntary interview. The chat logs obtained with those credentials were admitted because the voluntary disclosure sufficiently attenuated the taint.
No. A warrant obtained after an unlawful search does not cleanse the taint if the affidavit relies on information derived from that illegality. The court must determine whether the warrant rests on an independent, untainted source.
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Evidence is admissible if the connection to the initial illegality has become so attenuated that the taint dissipates. Courts consider temporal proximity, intervening circumstances, and the flagrancy of the misconduct.
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Only the victim of the Fourth Amendment violation may invoke the exclusionary rule. A co-conspirator or third party aggrieved solely by the introduction of the evidence lacks standing.
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Yes. If the government proves that the evidence would have been discovered through lawful means independent of the illegality, the evidence is admissible despite the initial violation.
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…costs. Id. , at 174-175. Standing to invoke the rule has thus been limited to cases in which the prosecution seeks to use the fruits of an illegal search or seizure against the victim of police misconduct. Rakas v. Illinois , 439 U. S. 128 (1978); Brown v. United States , 411 U. S. 223 (1973); Wong Sun v. United States , 371 U. S. 471,…