Rule that prosecutors must provide known information that may be used to impeach the witness due to credibility.

• A. Brady-Giglio Doctrine
• B. Jencks Doctrine
• C. Exclusionary Rule
• D. Miranda Rights

Answer: (A)

The main idea is the prosecutor’s duty to disclose information known to them that could be used to attack a witness’s credibility. This obligation comes from the Brady-Giglio line of cases: Brady v. Maryland established that prosecutors must share evidence favorable to the defense, and Giglio v. United States extended that to impeachment information about a witness’s credibility (such as deals, biases, or prior inconsistent statements) regardless of whether it directly exonerates the defendant. The goal is to prevent hidden bias or unreliable testimony from tipping the scales unfairly.

This rule is broader than the Jencks Doctrine, which focuses on producing a witness’s prior statements after that witness has testified, rather than pretrial disclosure of impeachment information. It’s also not about suppressing evidence gathered illegally (that’s the Exclusionary Rule) or about warnings given to suspects (Miranda Rights).