Giglio (Giglio v. U.S.) is associated with what concept?

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Giglio v. United States is about impeachment of witnesses and the disclosure of credibility-related information by the prosecution. The rule is that a defendant is entitled to evidence that could undermine a witness’s credibility—such as bias, motive to lie, prior inconsistent statements, or past dishonesty—so the defense can properly assess reliability. If a witness has lied under oath or demonstrated unethical behavior, that directly affects how much trust the jury can place in their testimony, which is precisely what Giglio seeks to illuminate for the defense. The other options refer to different constitutional protections: the right to counsel at trial, the requirement of probable cause for searches, and the exclusionary rule, none of which capture the impeachment/credibility disclosure focus of Giglio. So the concept associated with Giglio is impeachment information about a witness’s credibility, including misconduct or dishonesty that could impact testimony.