Also known as: tainted fruit doctrine · tainted fruits · fruit of the poisonous tree · poisonous tree doctrine
Written by attorneys · grounded in primary & secondary sources — see below
A doctrine extending the exclusionary rule to bar not only evidence obtained through a direct constitutional violation but also evidence later derived from exploitation of that illegality. The doctrine requires courts to determine whether derivative evidence was obtained by means sufficiently independent of the primary illegality or whether the causal connection remains unbroken. Attenuation analysis considers temporal proximity, intervening circumstances, and the flagrancy of official misconduct.
Federal agents hacked into Theresa Tucker's home server without a warrant and obtained IP logs showing access to a corporate cloud account. Agents used those logs as the sole basis for warrants targeting the company's records. The court suppressed both the original logs and the corporate records because the warrants rested entirely on information derived from the initial unlawful intrusion.
Officers unlawfully entered Tiffany Torres's apartment and seized her laptop. Three days after her release, Torres voluntarily appeared at the station, received warnings that she was free to leave, and provided server credentials. Police used the credentials to obtain chat logs from a third-party server. The court admitted the logs because the voluntary disclosure after a period of freedom sufficiently attenuated the connection to the initial entry.
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No. A later warrant does not automatically cure the taint. When the warrant affidavit rests solely on information obtained through the prior illegality, the resulting evidence remains derivative and subject to suppression absent an independent source or sufficient attenuation.
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Courts examine the temporal proximity between the illegality and the discovery of the evidence, the presence of intervening circumstances, and the flagrancy of the official misconduct. A voluntary act by the defendant after a meaningful period of freedom can break the causal chain.
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Evidence is admissible if it was discovered through a source wholly separate from the illegal conduct. Preexisting lawful information that could have supported a warrant on its own severs the causal connection to the illegality.
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No. The doctrine applies to any unreasonable search or seizure of persons, houses, papers, and effects, including corporate premises and digital intrusions such as warrantless tracking programs or keyword searches on email accounts.
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