The correct answer is Exclusionary rule.

The Exclusionary rule prevents evidence that was obtained through unlawful searches and seizures from being admitted at trial. It applies to physical items and to electronic data when those items were seized in violation of Fourth Amendment protections. The purpose of the rule is to deter unconstitutional police conduct by removing the benefit of using illegally obtained evidence.

Hearsay rule deals with out of court statements that are offered to prove the truth of the matter asserted. It governs the admissibility of testimony and statements and it does not decide whether evidence was lawfully seized.

Best evidence rule requires the original document or an acceptable duplicate when the content of a writing recording or photograph is at issue. It addresses proof of content and not the legality of how evidence was collected.

Chain of custody rule concerns the documented handling of physical or electronic evidence to show it was not altered or substituted. It is important for authenticity and reliability but it does not determine whether the initial search or seizure complied with constitutional protections.

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