A rule that states that evidence obtained in violation of an individual's constitutional rights cannot be used against that individual in a criminal trial.

A rule that states that evidence obtained in violation of an individual's constitutional rights cannot be used against that individual in a criminal trial.

• A. Exclusionary rule
• B. Fruit of the poisonous tree doctrine
• C. Miranda warning
• D. Best evidence rule

Answer: (A)

The exclusionary rule prohibits using evidence obtained in violation of a person’s constitutional rights in a criminal trial. This rule exists to deter unlawful police conduct by ensuring that illegally obtained proofs of guilt cannot be used to convict someone. It primarily applies to violations of protections like the Fourth Amendment against unreasonable searches and seizures, the Fifth Amendment right against self-incrimination, and the Sixth Amendment right to counsel. An important extension of this rule is the fruit of the poisonous tree doctrine, which bars not only the illegally obtained evidence itself but also additional evidence derived from the original improper source, unless an exception applies. This strengthens the incentive for law enforcement to stay within constitutional bounds. The other options address different concepts: a Miranda warning relates to informing suspects of their rights during custodial interrogation, which can affect admissibility in certain contexts but is not the blanket rule about excluding illegally obtained evidence. The best evidence rule concerns requiring original documents to prove a fact when the contents are at issue, not about suppressing evidence obtained unlawfully.

The exclusionary rule prohibits using evidence obtained in violation of a person’s constitutional rights in a criminal trial. This rule exists to deter unlawful police conduct by ensuring that illegally obtained proofs of guilt cannot be used to convict someone. It primarily applies to violations of protections like the Fourth Amendment against unreasonable searches and seizures, the Fifth Amendment right against self-incrimination, and the Sixth Amendment right to counsel.

An important extension of this rule is the fruit of the poisonous tree doctrine, which bars not only the illegally obtained evidence itself but also additional evidence derived from the original improper source, unless an exception applies. This strengthens the incentive for law enforcement to stay within constitutional bounds.

The other options address different concepts: a Miranda warning relates to informing suspects of their rights during custodial interrogation, which can affect admissibility in certain contexts but is not the blanket rule about excluding illegally obtained evidence. The best evidence rule concerns requiring original documents to prove a fact when the contents are at issue, not about suppressing evidence obtained unlawfully.