The Roviaro Balancing Test: When a Confidential Informant Must Be Disclosed

Where Does the Informer's Privilege Come From?

The informer’s privilege is the government’s common-law right to conceal the identity of people who report crime. Privilege in federal criminal cases is governed by the common law under Federal Rule of Evidence 501, and Roviaro v. United States recognized the informer’s privilege as one of them, grounded in effective law enforcement.

As the Supreme Court explained, the privilege “is in reality the Government’s privilege to withhold from disclosure the identity of persons who furnish information of violations of law to officers charged with enforcement of that law.” Its purpose is practical: citizens who report crime are more willing to come forward if the law shields their names, and that flow of information is a tool police depend on. The Fifth Circuit restated the same rationale decades later in United States v. Alaniz, describing the privilege as furthering “the public interest in effective law enforcement” by preserving anonymity.

Two features matter for a defense motion. First, the privilege belongs to the government, not the informant, so the informant cannot waive it and the government invokes it. Second, its scope is limited by its own purpose. The privilege protects identity, not the substance of a communication that would not reveal identity, and it evaporates once identity has already been disclosed to those with reason to resent it. Understanding that the privilege is a common-law rule — not an absolute constitutional shield — is the starting point, because it means the privilege can be overcome by a competing interest strong enough to outweigh it. That competing interest is the defendant’s right to a fair trial, and the mechanism for weighing the two is the Roviaro balancing test discussed below.

When Must the Privilege Give Way?

The privilege is not absolute. Under Roviaro, it must yield “where the disclosure of an informer’s identity, or of the contents of his communication, is relevant and helpful to the defense of an accused, or is essential to a fair determination of a cause.” That limitation arises from the fundamental requirements of fairness, not from any single rule.

The Court deliberately refused to draw a bright line. It held that “no fixed rule with respect to disclosure is justifiable” and that the problem “calls for balancing the public interest in protecting the flow of information against the individual’s right to prepare his defense.” 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.” In other words, the same informant can be undisclosable in one prosecution and disclosable in another, depending on what the informant saw and what the defense theory is.

Roviaro also tied materiality to the specific charge. The Court measured the informant’s possible testimony “by reference to the offense charged” and the evidence relating to it, then concluded that where the informant was the sole participant with the accused in the charged transaction, his testimony was potentially decisive and had to be available to the defense. The practical lesson for a federal motion is that a defendant cannot argue disclosure in the abstract. The motion must connect the informant to the elements the government has to prove and to a defense the accused actually intends to raise. If the court cannot see how the informant’s account could change the outcome, the balance tilts toward the privilege. If the informant sits close to the heart of the charged conduct, the balance shifts the other way.

How Does the Fifth Circuit Apply Roviaro?

Roviaro states a balance but not a formula. The Fifth Circuit — the circuit that governs federal prosecutions in the Northern and Eastern Districts of Texas — has turned the balance into a three-factor test. Courts weigh the informant’s involvement, the helpfulness of disclosure to the defense, and the government’s interest in secrecy.

The test appears in a long line of decisions. In United States v. De Los Santos, the court explained that it evaluates “the level of the informant’s involvement in the alleged criminal activity,” then “the helpfulness of disclosure to any asserted defense,” and finally “the government’s interest in nondisclosure.” United States v. Hickman restates the same three inquiries. No single factor is automatically decisive; the court weighs them together against the Roviaro backdrop.

Because the factors interact, a strong showing on one can offset a weaker showing on another. A deeply involved informant may have to be disclosed even where the government asserts routine safety concerns, while a peripheral informant will stay anonymous even if the defense would prefer to interview him. The three factors are examined in more depth in the sections that follow.

The Second Factor: The Defendant's Burden to Show Helpfulness

The helpfulness factor places a real burden on the defense. It is not enough to want the informant’s name. The defendant must make a sufficient showing that the informant’s testimony would significantly aid an asserted defense, and courts reject requests built on guesswork.

The Fifth Circuit has been explicit that “mere conjecture or supposition about the possible relevancy of the informant’s testimony is insufficient to warrant disclosure,” as De Los Santos put it. A defendant who says only that the informant “might” know something helpful, without connecting that knowledge to a defense, will lose the motion. The showing has to be specific: what the informant is likely to have seen, how that observation bears on an element the government must prove or on a defense such as misidentification or entrapment, and why the informant is the source of that information rather than a witness the defense already has.

This is why the strongest motions are built around the defense theory, not around the informant in isolation. If the defense is that the accused was misidentified, and the informant is the one person besides a testifying agent who saw the transaction, the informant’s account is squarely relevant to identity. If the defense is entrapment, the informant’s role in inducing the crime is directly at issue. In both situations counsel can articulate, concretely, how the testimony would help. Where the defense cannot make that link — because the informant only pointed police in a direction and never witnessed the charged conduct — the helpfulness factor collapses, and the court will not order disclosure no matter how much the defense would like the interview. The burden is the defendant’s, and it is a burden of specificity.

The Third Factor: The Government's Interest in Nondisclosure

The third factor asks what the government stands to lose from disclosure. Courts recognize two distinct interests: the physical safety of the informant and the informant’s continuing usefulness as a source. Both are weighed on the specific facts, not asserted as a blanket rule.

As De Los Santos explained, the government’s interest “relates to both the safety of the informant and the informant’s future usefulness to the authorities as a continuing confidential source.” Where the record shows a genuine danger — for example, evidence that the defendant is violent — that concern carries real weight. In Hickman, the court credited a legitimate fear for the informant’s life where the evidence included photographs of the defendant brandishing weapons. Safety concerns of that kind can tip the balance decisively toward the privilege.

But the government cannot win the third factor with generalities alone. The interest has to be measured against the facts of the case, and a weak or purely theoretical safety concern will not defeat a strong defense showing on the first two factors. That is the point of a balance: a peripheral informant with a thin defense need combined with a real danger stays hidden, while a central informant whose testimony is genuinely material may have to be disclosed even though every disclosure carries some risk. The government also cannot use the third factor to convert the informer’s privilege into a right to conceal a witness it intends to use. Once the informant becomes a testifying witness, the calculus changes entirely, a subject taken up on the companion page about tipster versus participant informants. On a pure balancing motion, the third factor is where the court asks whether the cost of disclosure is worth the benefit to the defense.

How Judges Rule, and What the Court Can Order

Disclosure rulings are committed to the trial court’s discretion. On appeal, the Fifth Circuit reviews the ultimate decision for abuse of discretion and any underlying fact findings for clear error. That deferential standard makes the record built in the district court decisive, so the balancing must be won at the trial level.

As United States v. Mendoza-Burciaga put it, the court “applies the clearly erroneous standard to findings of fact and the abuse of discretion standard to the conclusions reached by the trial court.” A defendant who does not develop the Roviaro factors in the district court has little chance of reversal later, because the appellate court will not reweigh a balance the trial judge was entitled to strike.

The trial court has a range of options. It can deny the motion and let the case proceed. It can order disclosure and, if the government refuses to comply, dismiss the affected charge — the remedy Roviaro identified, since the government cannot both withhold a material informant and prosecute on the evidence he produced. Between those poles, the court can hold an in-camera hearing to examine the informant’s likely testimony before deciding, a middle path covered on the companion page about the in-camera procedure. Which outcome follows depends on how the three factors line up. The disciplined approach is to tie the informant to the elements and the defense, meet the burden of showing concrete helpfulness, and force the government to justify secrecy on the actual facts rather than by reflex. Get those pieces on the record, and the balance — whichever way it falls — will rest on evidence the appellate court must respect.

Where This Fits

This guide is one of four situations that arise under the Motion to Reveal Confidential Informant. Start with the parent motion for the overall framework, or move to a related fact pattern:

What the Case Law Says

These decisions—verified against primary sources—control how this issue is litigated. Every case still turns on its own facts.

• Roviaro v. United States, 353 U.S. 53 (1957) — The informer's privilege must give way when disclosure is relevant and helpful to the defense or essential to a fair determination of the cause.
• United States v. De Los Santos, 810 F.2d 1326 (5th Cir. 1987) — Disclosure turns on the informant's involvement, the helpfulness to a defense, and the government's interest; mere conjecture about relevancy is insufficient.
• United States v. Hickman, 151 F.3d 446 (5th Cir. 1998) — Courts examine the informant's degree of involvement, helpfulness of disclosure, and the government's interest, including informant safety, in nondisclosure.
• United States v. Mendoza-Burciaga, 981 F.2d 192 (5th Cir. 1993) — Fact findings on informant disclosure are reviewed for clear error and the ultimate ruling for abuse of discretion.
• United States v. Alaniz, 726 F.3d 586 (5th Cir. 2013) — The informer's privilege furthers effective law enforcement and yields under Roviaro balancing weighing the flow of information against the right to defend.

General summaries of published opinions for information only — not predictions about any specific case.