Also known as: poisonous tree doctrine · fruit of the poisonous tree
Written by attorneys · grounded in primary & secondary sources — see below
A rule of evidence that bars admission of material obtained by exploiting an initial violation of constitutional rights. The doctrine treats such derivative material as tainted by the original illegality. Courts determine whether the taint persists by examining the causal connection between the violation and the later evidence.
Environmental officer Dana Cruz entered ChemTech's fenced property without a warrant and installed a hidden sampling device in a locked outfall pipe. The agency used data from that device to obtain search warrants for the company's servers and records. ChemTech moved to suppress the seized materials because they flowed directly from the initial unauthorized intrusion.
Agent Perez hacked into Malik's home server without a warrant and obtained IP logs. Perez then used those logs as the sole basis for warrants targeting NimbusCloud's internal records and emails. Malik moved to suppress the emails because the warrants rested entirely on information gained through the unlawful hack.
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Detective Leaming urged Williams to reveal the location of a child's body so the parents could give her a Christian burial. Williams led officers to the remains. The state later argued that search teams would have found the body anyway through an independent search already underway.
Federal agents arrested Feola without probable cause during a narcotics investigation. Feola then made statements implicating additional participants. Prosecutors sought to introduce testimony from those participants at trial.
Officers questioned Elstad at his home without first giving Miranda warnings and obtained an incriminating statement. Two hours later at the station they administered warnings and secured a second statement. Elstad moved to suppress the later statement as tainted by the earlier violation.
Police apprehended Quarles in a supermarket after a rape report and learned he had discarded a gun. Before giving Miranda warnings they asked where the gun was located. Quarles nodded toward some cartons and the officers recovered the weapon.
The doctrine requires exclusion of evidence obtained directly or indirectly through exploitation of an initial constitutional violation. Derivative evidence remains inadmissible unless an exception such as independent source or attenuation applies.
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Evidence escapes suppression when the connection to the initial illegality has become so attenuated that the taint dissipates. Courts weigh temporal proximity, intervening circumstances, and the flagrancy of official misconduct.
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A later warrant does not automatically purge the taint. If the warrant affidavit rests solely or primarily on information obtained through the initial violation, the resulting evidence remains subject to suppression absent an independent source or other exception.
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The inevitable-discovery exception permits admission of tainted evidence when the government shows that the evidence would have been discovered through lawful means independent of the constitutional violation. The exception prevents the government from being placed in a worse position than if no misconduct had occurred.
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…discovery exception to the exclusionary rule. Williams contends that evidence of the body's location and condition is "fruit of the poisonous tree," i. e. , the "fruit" or product of Detective Leaming's plea to help the child's parents give her "a Christian burial," which this Court had already held equated to interrogation. He…