A motion to disclose a confidential informant is a pretrial request asking a criminal court to order the prosecution to reveal the identity of a secret source. The motion forces a judge to weigh the defendant’s right to prepare a real defense against the government’s interest in keeping its sources anonymous, and the defendant who files it carries the burden of showing why the informant’s name actually matters to the case.
Why Informants Stay Anonymous by Default
The starting point is a doctrine called the informer’s privilege, which belongs to the government rather than to the informant personally. In Roviaro v. United States, the Supreme Court explained that the privilege exists to protect “the public interest in effective law enforcement” by encouraging people to share information about crime without fear of retaliation.1Justia. Roviaro v. United States If every cooperator’s name came out at trial, far fewer would cooperate.
Because of the privilege, prosecutors do not have to identify their confidential sources as part of routine discovery. The defense cannot simply demand the name and expect to receive it. A motion is the mechanism for forcing the question in front of a judge.
The Roviaro Balancing Test
Courts evaluate every disclosure motion under the framework from Roviaro. The judge weighs the public interest in protecting the flow of information to law enforcement against the defendant’s right to a fair trial. The Supreme Court rejected any automatic rule, holding that “whether nondisclosure is erroneous must depend on the particular circumstances of each case, taking into consideration the crime charged, the possible defenses, the possible significance of the informer’s testimony, and other relevant factors.”1Justia. Roviaro v. United States
The defendant has to show a concrete, specific need. A general hope that something useful might turn up will not carry the motion. The defense must point to a reasonable possibility that the informant’s testimony could change the outcome.
What Makes a Court More Likely To Order Disclosure
The Informant’s Role in the Alleged Crime
This is the most important factor. Courts draw a sharp line between an informant who merely tipped off the police and one who actively took part in the events. A tipster who phoned in a lead and had no further involvement rarely needs to be identified, because their testimony would not help the jury decide guilt or innocence. In Roviaro itself, the informant had helped set up the drug transaction, was the only non-government witness present when it happened, and was the only person who could confirm or contradict the prosecution’s version of events. The Court held that nondisclosure under those circumstances was reversible error.1Justia. Roviaro v. United States
The closer the informant was to the alleged crime, the stronger the argument for disclosure. An informant who negotiated the deal, witnessed the handoff, or was the only other person in the room is far more likely to get named.
The Defense Being Raised
Certain defenses make disclosure close to essential. Entrapment is the clearest example. If the defendant claims law enforcement induced them to commit a crime they would not otherwise have committed, the informant who set up the transaction is often the only person who can speak to what happened. Misidentification defenses and challenges to knowledge or intent can produce the same effect, because the informant may be the one witness with firsthand information on those elements.
Informant Safety as a Counterweight
Prosecutors can argue that revealing the identity would place the informant in physical danger, and courts take this seriously in cases involving organized crime or drug networks where retaliation is a real concern. A credible safety threat can tip the balance toward continued secrecy even when the informant played a meaningful role. Safety alone does not automatically defeat the defendant’s rights, though. The judge still has to weigh everything together.
Building and Filing the Motion
Defense attorneys build the argument from materials already in the case file. Police reports, arrest records, and witness statements often contain clues about the informant’s involvement even when the name itself is redacted. References to an unnamed source who “arranged the buy,” “introduced” the defendant to an undercover officer, or “was present during the transaction” all point toward the kind of active participation that strengthens a disclosure motion.
The written motion lays out the specific facts that place the informant at the center of the alleged crime, then applies the Roviaro factors to argue that the informant’s testimony is material to guilt or innocence rather than tangential. It closes by asking the court to order disclosure of the name and any information needed to locate the person.
Timing matters. These motions belong to the pretrial phase, and courts expect them well before trial. Filing late can weaken the argument, since the judge may wonder why the defense waited if the information was truly critical.
In-Camera Review
When the motion raises a close question, the judge can hold an in-camera hearing, which is a private session conducted outside the presence of the defendant and defense counsel. This procedure lets the court evaluate the informant’s potential testimony without prematurely revealing the identity.
During the hearing, the prosecution may present evidence about what the informant knows, or the judge may question the informant directly. A court reporter is present, and the transcript is sealed so that an appellate court can review it later if the case is appealed. Many of these motions are effectively decided here. The judge gets a private look at what the informant can offer and then rules on whether that information is important enough to require disclosure.
What Still Has To Be Disclosed Even if the Motion Fails
A denied motion does not end the prosecution’s disclosure obligations. Under Brady v. Maryland, the government must still turn over any evidence favorable to the defendant that is material to guilt or punishment.2Justia. Brady v. Maryland If the informant possesses exculpatory information, the prosecution cannot bury it behind the informer’s privilege.
The related rule from Giglio v. United States addresses witness credibility. If the prosecution plans to use the informant as a trial witness, the defense is entitled to know about any deals, payments, or promises of leniency the government made in exchange for cooperation, because the jury needs that information to assess believability.3Justia. Giglio v. United States In practice, the prosecution sometimes has to reveal what was promised to an informant even while the name stays secret.
What Happens After the Ruling
If the Motion Is Granted
When a court orders disclosure, the prosecution faces a choice: comply or accept the consequences. Most comply, turning over the name and contact information so the defense can investigate, interview, and potentially call the informant as a witness.
If the prosecution refuses, the remedy can be severe. The Supreme Court stated in Roviaro that “the trial court may require disclosure and, if the Government withholds the information, dismiss the action.”1Justia. Roviaro v. United States A judge may also strike testimony obtained through the informant, bar certain evidence, or give the jury a special instruction about the missing witness. Dismissal is the ultimate sanction and the one that gives the remedy its teeth.
If the Motion Is Denied
A denial means the court concluded that the defendant’s need for the information did not outweigh the government’s interest in secrecy. The defense proceeds to trial without being able to interview or call the informant. The issue is not necessarily closed. If the defendant is convicted, the denial can be raised on appeal, and the appellate court will review the sealed in-camera record to decide whether the trial judge got it right. A wrongful denial that affected the outcome can lead to a reversed conviction and a new trial, which is what happened in Roviaro itself.1Justia. Roviaro v. United States
Immediate appeal before trial is generally not available. Federal courts and most state courts require defendants to wait until after a final judgment before challenging a pretrial ruling on informant disclosure, since an acquittal at trial would make the appeal unnecessary.