Use and Derivative Use Immunity: Protections, Limits, and Enforcement

Use and derivative use immunity is a federal protection that bars the government from using your compelled testimony, or any evidence it finds because of that testimony, against you in a criminal case. It is codified at 18 U.S.C. § 6002 and represents the constitutional minimum a court must offer before it can override your Fifth Amendment right to remain silent.¹ It sounds airtight. The real-world boundaries are narrower than most people assume, and knowing where the protection stops matters as much as knowing what it covers.

The Two Layers of Protection

The protection works in two parts, and both have to hold for the immunity to be constitutionally sufficient.

The first layer is use immunity. The government cannot introduce your compelled statements as evidence in any criminal case against you. Your words, your transcripts, your recorded testimony — none of it can appear at your trial as an admission or confession.

The second layer is derivative use immunity, and it is the more powerful one. Prosecutors cannot take your testimony as a starting point and follow it to other incriminating evidence. If you mention a bank account during immunized testimony, the government cannot subpoena the records on the strength of that lead and then charge you based on what it finds. The statute bars both the compelled testimony itself and “any information directly or indirectly derived from such testimony.”¹

The Supreme Court set the benchmark in Kastigar v. United States, 406 U.S. 441 (1972), describing this standard as leaving “the witness and the Government in substantially the same position as if the witness had claimed his privilege” and never spoken at all.² If the government ends up better off because you testified, the immunity has failed. The Court held that this scope “is coextensive with the scope of the privilege against self-incrimination, and therefore is sufficient to compel testimony over a claim of the privilege.”³

How It Differs From Transactional Immunity

Use and derivative use immunity is often confused with transactional immunity, and the difference is enormous.

Transactional immunity prevents the government from prosecuting you at all for the offense you testified about, regardless of how strong independent evidence might be. If you received transactional immunity for a fraud scheme and a whistleblower later handed prosecutors ironclad proof of your involvement, you still could not be charged.

Use and derivative use immunity offers no such blanket protection. You can be prosecuted for the same crime you discussed. The government simply has to prove it built its case without touching your immunized testimony or anything that flowed from it. Congress made this choice deliberately when the Organized Crime Control Act of 1970 replaced all prior federal immunity statutes and adopted use and derivative use immunity as the sole federal standard.¹ Some states still offer transactional immunity under their own statutes, but the Constitution does not require it.

What the Immunity Does Not Cover

Several categories of evidence and prosecution fall outside the shield entirely. Testifying under immunity without understanding these gaps is dangerous.

Perjury and False Statements

The statute explicitly carves out prosecutions for “perjury, giving a false statement, or otherwise failing to comply with the order.”¹ Immunity shields truthful testimony. It does not license lying. If you give demonstrably false statements under an immunity order, those words become the basis for a perjury charge.

Evidence From Independent Sources

Anything investigators already had before you spoke stays fully admissible. A weapon from an unrelated search, financial records pulled under a separate subpoena, a cooperating witness who came forward on their own — all of it remains in play. The prosecution has to show a documented timeline proving the evidence came through channels that existed apart from your testimony.⁴

Physical and Non-Testimonial Evidence

The Fifth Amendment protects only testimonial evidence, meaning communications that reveal the contents of your mind. Physical evidence like DNA, fingerprints, blood samples, and handwriting exemplars sits outside that protection. The Supreme Court drew the line in Schmerber v. California (1966), holding that the privilege covers “communicative or testimonial evidence, not physical or real evidence.” You can be compelled to provide a DNA sample or stand in a lineup regardless of any immunity analysis.

The Act of Production Doctrine

Documents are a wrinkle. The contents of pre-existing business records generally are not protected by the Fifth Amendment, but the act of handing them over can be. Producing documents in response to a subpoena implicitly communicates three things: that the documents exist, that you possess them, and that you believe they match what was requested. Those implicit admissions are testimonial.

In United States v. Hubbell, 530 U.S. 27 (2000), the Supreme Court held that when a witness produces documents under an immunity order, the government cannot use the testimonial aspects of that production — the fact that the witness identified and assembled the responsive documents — as a lead to build a prosecution. The Court found that the “testimony inherent in the act of producing those documents” was protected and dismissed the indictment because the prosecution could not show its evidence was independent of Hubbell’s act of production.⁵

Federal Immunity and State Prosecutors

One of the most dangerous gaps involves the federal-state divide. A federal immunity order does not automatically bar state prosecution altogether.

The Supreme Court addressed cross-sovereign exposure in Murphy v. Waterfront Commission, 378 U.S. 52 (1964), holding that the Fifth Amendment protects “a state witness against incrimination under federal as well as state law and a federal witness against incrimination under state as well as federal law.”⁶ Under Murphy, compelled testimony and its fruits cannot be used by the other sovereign.

Here is the catch. Murphy prevents the other sovereign from using your immunized testimony or anything derived from it. It does not stop that sovereign from prosecuting you if it has independent evidence. A state prosecutor who already has a case built on evidence gathered without any connection to your federal testimony can still bring charges. Immunity controls what can be used as evidence. It does not bar the prosecution itself.

How the Protection Is Enforced

Kastigar did not just set the rule. It also created the enforcement mechanism, now known as a Kastigar hearing.

When a previously immunized witness is later charged, the defendant can challenge the prosecution’s evidence by showing they testified under immunity about matters related to the charges. At that point, the burden shifts entirely to the government. Prosecutors must affirmatively prove “that the evidence it proposes to use is derived from a legitimate source wholly independent of the compelled testimony.”²

This is a heavy burden. Prosecutors cannot simply deny taint; they have to trace each piece of evidence to a clean origin. If the government cannot clearly document where its proof came from, the evidence is suppressed.

The Oliver North prosecution shows how far this reaches. North testified before Congress under an immunity order, and his televised testimony was watched by millions. When he was later prosecuted by an independent counsel, the D.C. Circuit vacated his convictions because the trial court had failed to hold an adequate Kastigar hearing. The appellate court found that trial witnesses may have had their memories refreshed or their testimony shaped by exposure to North’s immunized congressional testimony, and that kind of indirect influence counts as derivative use.⁷ Derivative use reaches well beyond physical evidence. Even subtle influence on a witness’s recollection can taint a prosecution.

Why a Proffer Agreement Is Not the Same Thing

Many people first encounter the idea of immunity through a proffer agreement, often called a “Queen for a Day” session, and assume it carries the same protections. It does not.

A proffer agreement is a contract between a defendant and a prosecutor. The government typically agrees not to introduce your own statements in its case-in-chief. But most proffer agreements include a clause letting the government follow investigative leads generated by what you said. If those leads turn up new evidence, that evidence is fair game. That is the opposite of derivative use immunity, which bars the government from pursuing any trail that starts with your words.

Proffer agreements also commonly include impeachment clauses. If anything you say at trial contradicts your proffer statements, the government can use those statements to attack your credibility. Statutory immunity under § 6002 does not permit this. The oversight is different, too. Proffer agreements are governed by contract law, with no required judicial review and no statutory floor. Statutory immunity is authorized by federal law, approved by senior Justice Department officials, and imposed by court order with the full weight of the Fifth Amendment behind it.⁸

What Happens If You Refuse After an Order Issues

Once a court issues an immunity order, the Fifth Amendment is no longer available as a basis for silence. A witness who still refuses to testify faces contempt.

Under 28 U.S.C. § 1826, a recalcitrant witness may be confined until willing to comply, but confinement cannot exceed the life of the court proceeding or the term of the grand jury (including extensions), and in no event can it exceed eighteen months.⁹ This is civil contempt, coercive rather than punitive, designed to compel compliance.

Criminal contempt is also possible under 18 U.S.C. § 401, carrying a fine of up to $1,000 or imprisonment of up to six months in summary proceedings.¹⁰ For criminal contempt prosecuted through a full hearing with notice, punishment is potentially unlimited. Witnesses facing grand jury immunity orders should also know that their attorney is not permitted inside the grand jury room. You may step outside to consult with counsel, but you testify without a lawyer at the table.¹¹

1
Office of the Law Revision Counsel. 18 USC 6002 – Immunity Generally
2
Justia. Kastigar v. United States, 406 US 441 (1972)
3
Library of Congress. Kastigar v. United States, 406 US 441 (1972)
4
U.S. Department of Justice. Criminal Resource Manual 718 – Derivative Use Immunity
5
Justia. United States v. Hubbell, 530 US 27 (2000)
6
Library of Congress. Murphy v. Waterfront Commission, 378 US 52 (1964)
7
Justia. United States v. Oliver L. North, 910 F2d 843
8
Office of the Law Revision Counsel. 18 USC 6003 – Court and Grand Jury Proceedings
9
Office of the Law Revision Counsel. 28 USC 1826 – Recalcitrant Witnesses
10
United States Department of Justice. Criminal Resource Manual 728 – Criminal Contempt
11
United States Department of Justice. 9-11.000 – Grand Jury