Which statement is accurate about Giglio letters?

• A. They result in the officer's permanent removal from duty
• B. They inform the officer's employer about the officer's inability to testify in any future proceedings
• C. They instruct the officer to testify in every case
• D. They are used to grant additional witness immunity

Answer: (D)

Giglio letters focus on witness impeachment by disclosing any promises or immunity a witness has in exchange for testimony. This lets the defense know whether a witness has immunity or other favorable treatment that could affect credibility, so they can tailor cross-examination accordingly. The letters don’t grant immunity themselves; they report what immunity or deals exist. This disclosure is essential for fair proceedings, because it allows credibility to be properly assessed.