Brady Disclosure Explained: Brady Material, Giglio and Rule 16

When favorable evidence never reaches the defense, a conviction can be reversed and the case tried again. The duty to disclose that evidence rests with the prosecutor, but much of it is created and held by police: reports, recordings, interview notes and officer records.

This guide explains what Brady material is, the Supreme Court cases behind it, how Giglio material and Rule 16 discovery differ, and what the rules mean for agencies that hold the evidence.

What is Brady material?

Brady material is evidence favorable to a person accused of a crime, either because it supports innocence or a lesser sentence, or because it could be used to impeach a prosecution witness. Under Brady v. Maryland and later Supreme Court cases, prosecutors must disclose it to the defense when it is material to guilt or punishment.

The rule takes its name from Brady v. Maryland, 373 U.S. 83, decided on May 13, 1963. Brady's lawyer had asked for his companion's statements, but the prosecution withheld one in which the companion admitted the actual killing. The Supreme Court held that suppressing favorable evidence after a request violates due process where it is material to guilt or punishment, whatever the prosecution's good or bad faith.

Later cases dropped the need for a request and confirmed that impeachment evidence is covered. Strickler v. Greene (1999) describes a Brady violation in three parts:

1. The evidence is favorable to the accused, because it is exculpatory or impeaching.
2. The government suppressed it, willfully or inadvertently.
3. Prejudice resulted: the evidence was material.

The Supreme Court cases that define Brady disclosure

• Giglio v. United States, 405 U.S. 150 (1972). The key witness had been promised he would not be prosecuted, and the promise was not disclosed. Evidence affecting a witness's credibility falls under Brady when that witness's reliability may decide guilt or innocence, and a promise made by one prosecutor is attributed to the government.
• United States v. Bagley, 473 U.S. 667 (1985). Impeachment and exculpatory evidence are treated alike. Evidence is material if there is a reasonable probability that, had it been disclosed, the result would have been different: a probability sufficient to undermine confidence in the outcome.
• Kyles v. Whitley, 514 U.S. 419 (1995). The prosecutor has a duty to learn of favorable evidence known to others acting for the government in the case, including the police. Materiality is judged on all the withheld evidence together, not item by item.

These due process duties apply in state and federal prosecutions alike: Brady and Kyles were state cases, Giglio and Bagley federal.

Brady vs Giglio vs Rule 16 discovery

Brady and Giglio are constitutional duties. Rule 16 of the Federal Rules of Criminal Procedure lists categories of information the government must provide in federal cases when the defendant asks, whether or not it helps the defense.

The Brady and Giglio timing comes from the Justice Department's Justice Manual 9-5.001, which goes beyond what the Constitution requires. State prosecutions follow each state's own discovery rules, which vary.

Brady lists and Giglio lists

Police officers often testify for the prosecution, so information about their credibility can be Giglio material. Many prosecutors' offices keep a record of officers with past findings, such as dishonesty, that may need to be disclosed when they testify. Names include Brady list, Giglio list and potential impeachment disclosure list. Whether a list exists, what puts an officer on it and how an officer can challenge it vary by office and state.

In federal cases, the Justice Department's Giglio policy (Justice Manual 9-5.100) has investigative agencies report potential impeachment information about employees who may testify, such as misconduct findings that reflect on truthfulness or bias, and past or pending criminal charges.

The Due Process Protections Act and Rule 5(f)

The Due Process Protections Act (Public Law 116-182) became law on October 21, 2020. It added Rule 5(f), Reminder of Prosecutorial Obligation, to the Federal Rules of Criminal Procedure.

In every federal criminal proceeding, on the first scheduled date when both the prosecutor and defense counsel are present, the judge must issue an oral and written order. It confirms the prosecutor's disclosure obligation under Brady and its progeny, and the possible consequences of violating the order. Each judicial council must publish a model order. The rule doesn't change what Brady requires; the Act's stated purpose is to remind prosecutors of their obligations.

Do police agencies have Brady obligations?

The disclosure duty belongs to the prosecutor, but it reaches evidence held by police. Under Kyles v. Whitley, the prosecutor must learn of favorable evidence known to others acting for the government, and remains responsible for it even if police never pass it on. Body-worn and dash-cam footage, interview recordings, phone extractions, notes and officer records can all contain Brady or Giglio material.

That makes record keeping part of disclosure. When evidence sits in one digital evidence management system, with a chain of custody for each item, it is easier to show what the prosecution had and when the defense received it. Agencies should follow their prosecutor's office and state rules on what to send and when. This article is general information, not legal advice.

Where DekkoDEMS fits

DekkoDEMS collects, stores, shares and discloses digital evidence, from body-worn and CCTV footage to phone extractions and documents, with a record of every action on each file. Prosecutors and defense counsel get access to evidence instead of copies, from the same record everyone works from. Every view, download and change to access is logged, and every file and case has an immutable audit trail. See how DekkoDEMS handles evidence disclosure.

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