Use Immunity vs. Derivative-Use vs. Transactional Immunity

What Are the Three Kinds of Immunity in Federal Court?

Federal law recognizes three distinct grades of immunity, and they are not interchangeable. Transactional immunity blocks prosecution for the whole offense. Use immunity forbids using your statement itself. Derivative-use immunity forbids using anything the government learns because of your statement. A federal grant almost always means the second and third combined.

The distinction is old, but it still decides cases. Transactional immunity is the broadest: once you testify about a transaction, you cannot be prosecuted for that transaction at all, no matter how much independent evidence exists. Use and derivative-use immunity is narrower and is what 18 U.S.C. § 6002 supplies. Under that statute the government keeps the power to charge you, but it must build its case entirely from sources untouched by your compelled words.

The Supreme Court held in Kastigar v. United States that use and derivative-use immunity is constitutionally sufficient because it leaves you in the same position as if you had stayed silent. That equivalence is the whole theory. If the government can prosecute you using material it would never have found without your testimony, the immunity has failed and the Fifth Amendment is violated. The grade you hold therefore sets the ceiling on the government’s power and the floor of your protection.

What Does 18 U.S.C. 6002 Actually Grant?

A federal immunity order is not a favor and not a promise to drop the case. It is a statutory command to testify, paired with a narrow shield. Section 6002 says that no compelled testimony — and no information directly or indirectly derived from it — may be used against the witness in any criminal case, with one exception.

The text is precise. The statute reaches “any information directly or indirectly derived from” the compelled testimony, which is the derivative-use half of the protection. That is why a proper immunity fight is never just about whether the prosecutor quoted your words to the jury. It is about every lead, every witness, and every document that exists in the file because you were forced to talk. The word “indirectly” does real work, extending the shield well past the four corners of the transcript.

The exception matters too. Section 6002 does not immunize perjury, giving a false statement, or failing to comply with the order. You can be prosecuted for lying under the grant even though you cannot be prosecuted using the truthful parts. The order itself issues under 18 U.S.C. § 6003, on the request of the United States Attorney with approval from the Attorney General or a designated deputy, when the testimony may be necessary to the public interest and the witness is likely to invoke the privilege.

Because the statute is worded as use-and-derivative-use immunity, it is a mistake to assume a “grant of immunity” means you walk away clean. It means close to the opposite: the government intends to keep investigating and may still indict, but now it carries a heavy burden to prove its evidence came from somewhere other than you.

Why Is Transactional Immunity So Rare in Federal Court?

For most of American history, transactional immunity was thought to be the constitutional minimum. That changed in 1972, and the shift explains why federal prosecutors now offer the narrower use-and-derivative grade almost every time. The history is worth knowing because defense arguments still draw on it.

In Counselman v. Hitchcock, the Supreme Court struck down an early immunity statute, holding that no law leaving the witness subject to later prosecution could displace the privilege, and that a valid statute must afford “absolute immunity against future prosecution for the offence to which the question relates.” That language was read for decades to require full transactional immunity as the price of compelling testimony.

Congress answered by enacting broad transactional statutes, and the Court upheld them. Brown v. Walker approved a statute that exempted the witness from any prosecution for the transaction testified about, reasoning that once criminal liability is removed the witness is no longer a witness against himself. Sixty years later, Ullmann v. United States reaffirmed that transactional immunity under the Immunity Act of 1954 was a sufficient substitute for the privilege.

Then Kastigar reinterpreted Counselman, holding that use and derivative-use immunity — not full transactional immunity — is all the Constitution demands. Prosecutors immediately preferred the narrower grade, because it lets them compel testimony without surrendering the ability to charge the witness. Today a federal witness who receives statutory immunity almost never receives transactional immunity; the offense stays on the table, and the fight moves to sources and taint rather than to an outright bar.

Use Immunity vs. Derivative-Use Immunity: Where Is the Line?

Within the narrower grade, use and derivative-use are two separate protections bundled together, and separating them clarifies what the government may not do. Use immunity keeps your actual statement out of evidence. Derivative-use immunity keeps out the fruit of that statement, even when the fruit looks like ordinary, independent proof.

Direct use is easy to spot: the prosecutor cannot read your immunized grand jury answers to the trial jury or hand them to a testifying agent. Derivative use is subtler and is where most litigation happens. If your compelled testimony pointed investigators to a bank account, a co-conspirator, or a storage unit, the money, the witness, and the contents of the unit are all derivative fruit, and the statute bars them unless the government would have found them by wholly independent means.

The Fifth Circuit put the standard plainly in United States v. Seiffert, explaining that immunity from use and derivative use is coextensive with the Fifth Amendment and leaves the witness and the government in substantially the same position as if the witness had claimed the privilege. Seiffert also warned that conclusory statements — an agent simply swearing he did not rely on the testimony — are not enough to carry the government’s burden, a point later courts have repeated.

This is why the label on your immunity is only the starting point. Two witnesses can both hold “use immunity,” yet one has a live derivative-use claim worth pressing and the other does not, depending entirely on whether the prosecution’s evidence traces back to the compelled words. Mapping that trace — matching each item of the government’s proof to a source that predates or exists apart from the testimony — is the core of the defense.

Informal Immunity, Letter Immunity, and Proffer Grants

Not all immunity comes from a court order. Much of it is contractual: a letter from the United States Attorney, a cooperation clause in a plea agreement, or a proffer “queen for a day” understanding. These informal grants are read like contracts, and their scope depends on the words the parties chose, not on the statute.

Because informal immunity is negotiated, its grade can vary. Some proffer letters grant full use and derivative-use protection; others grant only direct-use protection and expressly reserve the government’s right to follow leads. The Fifth Circuit has treated “use immunity” in these agreements as a term of art that often covers both direct and derivative use, yet it also recognizes that when a defendant volunteers information rather than being compelled, the Fifth Amendment is not triggered and the parties may bargain for a lesser degree of protection.

The difference between formal and informal immunity shaped United States v. Edward Jimenez, where the Fifth Circuit rejected a claim of transactional immunity, treated the nonprosecution understanding as a contract, and held that the defendant carried only use immunity — not a bar to prosecution. Whoever claims the broader grade bears the burden of proving the parties actually agreed to it, through their words or their conduct.

For a defendant, the practical lesson is to read the grant before assuming its reach. A proffer session conducted under a narrow letter can expose far more than a witness expects. The specific limits on proffer and queen-for-a-day statements are covered on the companion satellite page; here the point is only that the grade of immunity, formal or informal, is what defines your exposure and dictates the motion you can bring.

Why the Grade of Immunity Decides Your Defense Strategy

Identifying the grade of immunity is not an academic exercise. It determines which motion you file, who carries the burden, and what a hearing will look like. The three grades lead to three different postures, and getting the label right early prevents wasted effort later.

If you hold transactional immunity for the charged offense, the remedy is a motion to dismiss the prosecution outright, because the offense itself is barred. If you hold use and derivative-use immunity, dismissal is not automatic; instead the government must prove that its evidence came from legitimate sources wholly independent of your compelled testimony, a burden litigated at what courts call a taint or Kastigar hearing. Those two mechanisms are covered on the companion pages addressing the government’s independent-source burden and the taint hearing itself.

The distinction also drives timing and preservation. A defendant who has given immunized testimony should flag it before the government builds a file, so counsel can document what the witness said and when, and then test the prosecution’s evidence against that timeline. Because the government cannot rely on an agent’s bare denial, the defense that maps the compelled testimony to each piece of the government’s proof is usually the one that forces a real hearing rather than a rubber stamp.

L and L Law Group handles federal matters in the Northern and Eastern Districts of Texas, where these questions arise in grand jury investigations, cooperation agreements, and multi-defendant prosecutions. The firm can be reached at (972) 370-5060 or info@landllawgroup.com to review the terms of an immunity grant and the exposure it actually creates.

Where This Fits

This guide is one of four situations that arise under the Kastigar Motion / Hearing. 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.

• Counselman v. Hitchcock, 142 U.S. 547 (1892) — A statute compelling testimony is valid only if it affords absolute immunity against future prosecution; mere use immunity is insufficient.
• Brown v. Walker, 161 U.S. 591 (1896) — A statute granting full transactional immunity from prosecution for the transaction testified about is a constitutional substitute for the privilege.
• Ullmann v. United States, 350 U.S. 422 (1956) — The Immunity Act of 1954, granting transactional immunity, is a sufficient substitute for the Fifth Amendment privilege against self-incrimination.
• United States v. Edward Jimenez, 256 F.3d 330 (5th Cir. 2001) — Nonprosecution agreements are contractual; this defendant received only use immunity, not transactional immunity barring prosecution.
• United States v. Seiffert, 463 F.2d 1089 (5th Cir. 1972) — Use and derivative-use immunity is coextensive with the Fifth Amendment, leaving witness and government in substantially the same position.

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