What is the fruit of the poisonous tree doctrine?

• A. Evidence obtained directly or indirectly as a result of unconstitutional conduct is generally inadmissible.
• B. All evidence obtained unlawfully is always admissible.
• C. Only testimony derived from a tainted source is inadmissible.
• D. The doctrine applies only to physical evidence.

Answer: (A)

The fruit of the poisonous tree doctrine is that evidence obtained as a result of an unconstitutional government action is generally inadmissible in court, and that includes not only the initial tainted material but also any further evidence derived from it. This keeps the benefits of constitutional protections in place, because if police corruption or violations taint the path to the evidence, the courts won’t allow that entire chain to be used against the defendant. The rule sits under the broader exclusionary rule and is designed to deter improper police conduct and safeguard rights.

In practice, this means if an illegal search or arrest leads to other evidence being discovered or a confession being obtained, that derivative evidence is usually excluded too, unless a recognized exception applies—such as an independent source for the evidence, inevitable discovery, or attenuation of the taint. This concept applies to both testimonial and physical evidence, and to evidence derived from illegal actions beyond the direct material seized or statements made.