Limited immunity is a conditional deal: in exchange for your cooperation or testimony, the government promises not to use your words — and usually not evidence derived from your words — against you in a criminal case. It stops short of wiping the slate. Prosecutors can still charge you for the same conduct if they build the case from independent sources, and the protection does not cover lying under oath, civil consequences, or proceedings outside the agreement. The most common form, under federal law, is called “use and derivative use” immunity, and it is “limited” precisely because it protects your statements rather than you.
What Use Immunity Actually Covers
The federal immunity statute lives at 18 U.S.C. §§ 6001–6005, enacted as part of the Organized Crime Control Act of 1970.1Cornell Law Institute. Immunity of Witnesses When a witness refuses to testify in a federal proceeding by invoking the Fifth Amendment, the government can ask a court to compel the testimony. In return, the witness receives use immunity: the compelled testimony, and any evidence directly or indirectly derived from it, cannot be used against the witness in any criminal case.2Cornell Law Institute. 18 U.S.C. § 6002 – Immunity Generally
What that protection leaves on the table is the point of the word “limited.” Prosecutors can still bring charges for the same underlying conduct if their evidence comes from sources entirely independent of what you said. The immunity also does not cover prosecution for perjury, false statements, or refusing to comply with the immunity order itself.3Office of the Law Revision Counsel. 18 U.S.C. Chapter 601 – Immunity of Witnesses And it only reaches criminal proceedings. Immunized testimony may still surface in civil litigation, disciplinary matters, or tax proceedings.
Use Immunity vs. Transactional Immunity
The sharpest way to understand what use immunity does not do is to compare it with the older, broader form. Transactional immunity provides complete protection: once you testify about an offense, you can never be prosecuted for that offense, no matter what evidence turns up later. Use immunity only bars the government from using your compelled testimony and its fruits; prosecution based on independently obtained evidence remains possible.4Cornell Law Institute. Fifth Amendment – Immunity
The federal system uses only the narrower use-and-derivative-use model. Some states still offer transactional immunity in certain proceedings.5Justia. Immunity for Testimony One jurisdiction’s grant does not automatically bind another. Testimony given under a state immunity order may still expose you to federal prosecution for the same conduct, and the reverse is true as well.
Why a Narrower Deal Is Constitutional
The Fifth Amendment protects you against being compelled to incriminate yourself. The government can only override that protection by offering immunity, in the Supreme Court’s phrase, “coextensive with the scope of the privilege.” Two cases drew the current line.
In Counselman v. Hitchcock (1892), the Court struck down an early immunity statute that merely barred direct use of compelled testimony. Because prosecutors could still work the leads to build a case, the Court held, the witness remained exposed and the statute failed to replace the privilege it displaced. The ruling demanded “absolute immunity against future prosecution for the offence to which the question relates.”6Justia US Supreme Court. Counselman v. Hitchcock, 142 U.S. 547
That reading pushed Congress toward transactional immunity for decades. Then came the 1970 statute, which returned to use immunity but added an explicit ban on derivative use. In Kastigar v. United States (1972), the Court upheld the new law 5–2. Writing for the majority, Justice Lewis Powell reasoned that because the statute prohibited any use of the testimony, the witness was left in substantially the same position as if the privilege had been invoked. Transactional immunity, the Court said, goes further than the Constitution requires.7Justia US Supreme Court. Kastigar v. United States, 406 U.S. 4418Oyez. Kastigar v. United States
A later case, Pillsbury Co. v. Conboy (1983), set an important boundary. A witness who had testified before a grand jury under immunity was later subpoenaed for a civil deposition and asked to repeat the same testimony. The Court held that the original grant did not extend to the deposition. Forcing the witness to answer without a fresh immunity order would effectively convert use immunity into the broader transactional protection Congress had rejected.9FindLaw. Pillsbury Co. v. Conboy, 459 U.S. 248 The practical takeaway: an immunity grant usually attaches to one proceeding, not to the entire subject matter.
If You’re Charged Later: The Kastigar Hearing
Use immunity has teeth because of the hearing that follows if the government tries to charge you after you’ve testified. The defense moves to dismiss on the ground that the case is tainted by the immunized statements. The burden then shifts to the government to prove, by a preponderance of the evidence, that every piece of evidence it plans to use comes from a source wholly independent of what you said.7Justia US Supreme Court. Kastigar v. United States, 406 U.S. 441
Courts weigh several factors: whether the investigation was already complete when you testified, whether charging decisions had already been made, whether your statement revealed anything the government did not already have, and whether the trial team was exposed to your testimony. Prosecutors sometimes build a “Chinese wall” separating the team that handled the immunized testimony from the one later building the case, though courts have not required it in every situation.10U.S. Court of Appeals for the Armed Forces. Digest of Opinions – Immunity
These hearings can decide a case. One military appellate decision dismissed charges after finding the government had used one immunized witness’s testimony to pressure another into implicating the first. In another, the prosecution prevailed by showing the entire investigation and the charging decision were locked in before the immunized testimony was given.10U.S. Court of Appeals for the Armed Forces. Digest of Opinions – Immunity
Proffer Agreements: The Informal Cousin
Outside the statute, prosecutors often use proffer agreements, sometimes called “Queen for a Day” letters. In a proffer, a suspect or witness sits down with prosecutors and shares information, usually as a first step toward a cooperation or plea deal. The agreement functions as a contract: the government agrees not to use your statements directly in its case-in-chief, and you agree to tell the truth.
Proffer protection is narrower than statutory immunity in several ways. Most agreements expressly let the government chase leads from the proffer and use any independently discovered evidence to bring charges. They typically allow prosecutors to use your proffer statements to impeach you if you later testify inconsistently at trial, or to rebut inconsistent defense evidence. They require you to waive protections under Federal Rule of Evidence 410 and Federal Rule of Criminal Procedure 11(f), which would otherwise shield statements made during plea negotiations.
The downside risk is real. Lying during a proffer can produce separate charges for perjury, false statements, or obstruction, and the proffer statements themselves can be used to prove the falsehood. Courts have generally enforced broad waiver provisions. In United States v. Krilich (1998), the Seventh Circuit allowed the government to use proffer statements after the defendant introduced trial evidence the court found inconsistent with them. Proffer immunity usually binds only the specific U.S. Attorney’s office that signed it; another federal district may remain free to prosecute unless the agreement says otherwise.
What Still Puts You at Risk
Even with a formal grant of use immunity, several exposures remain:
- Independent-source prosecution. The government can still charge you for the same conduct if it demonstrates every piece of its evidence comes from a source independent of your compelled testimony.
- Perjury. An immunized witness who lies under oath can be prosecuted, and the immunized testimony itself can be used to prove the falsehood.11Cornell Law Institute. Fifth Amendment – Self-Incrimination and the Concept of Immunity
- Contempt. Refusing to testify after an immunity order can bring civil or criminal contempt and jail time.
- Non-criminal proceedings. Civil cases, licensing boards, employment discipline, and tax matters are not covered. The shield reaches criminal cases only.
- Jurisdictional gaps. Informal immunity letters typically bind only the office that signed. Another federal district or a state prosecutor may not be bound.
- No automatic carryover. As Pillsbury established, a grant in one proceeding does not necessarily cover the next. You may need to reassert the privilege each time you’re called in a new forum.
Other Settings Where You’ll See the Term
“Limited immunity” also appears in two settings worth flagging so you don’t confuse them with the witness-immunity framework above.
NCAA Enforcement
In NCAA investigations, the association may offer limited immunity to student-athletes or institutional employees in exchange for full cooperation and truthful testimony.12NCAA. Limited Immunity FAQs The NCAA agrees not to charge the individual with the disclosed violations in the infractions process. The protection runs only to NCAA consequences; it does not stop the institution from imposing its own discipline, and it does not restore a student-athlete’s eligibility if they competed while ineligible.13NCAA. Division III Enforcement Internal Operating Procedures The grant can be revoked for incomplete cooperation or false information.
Presidential Immunity Under Trump v. United States
The Supreme Court’s 2024 decision in Trump v. United States used a form of limited protection in a very different context. The 6–3 ruling set a tiered framework for criminal prosecution of a former president: absolute immunity for actions within the “core” of presidential constitutional authority, “presumptive immunity” for other official acts within the “outer perimeter” of presidential duties, and no immunity for unofficial acts. The presumption on official acts can be overcome only if prosecutors show that applying criminal law to the conduct would pose no danger of intruding on executive branch authority and functions.14Supreme Court of the United States. Trump v. United States, No. 23-93915SCOTUSblog. Justices Rule Trump Has Some Immunity From Prosecution Justice Sonia Sotomayor, in dissent, said the ruling “reshapes the institution of the Presidency.” This framework governs whether prosecution can proceed at all, not what evidence may be used against a cooperating witness.
Not the Same as Qualified Immunity
Limited immunity is sometimes confused with qualified immunity, but the two have little in common. Qualified immunity is a judge-made defense that protects government officials, most often law enforcement officers, from civil lawsuits for money damages. It applies when the official’s conduct did not violate “clearly established statutory or constitutional rights of which a reasonable person would have known.”16Congressional Research Service. Qualified Immunity – An Overview It operates in civil cases, primarily suits under 42 U.S.C. § 1983 or Bivens actions. It has no bearing on compelled testimony or the Fifth Amendment. The modern test traces to Harlow v. Fitzgerald (1982).17National Association of Attorneys General. Qualified Immunity
What Limited Immunity Looks Like in Practice
A recent high-profile example illustrates how proffer-style immunity actually works. Ghislaine Maxwell, convicted in 2021 of federal sex-trafficking charges related to Jeffrey Epstein and sentenced to 20 years, met in July 2025 with Deputy Attorney General Todd Blanche for roughly nine hours of interviews over two days at the federal courthouse in Tallahassee, Florida. The Department of Justice described the arrangement as “limited” or “proffer” immunity: her statements could not be used against her in future proceedings, provided she told the truth.18NBC News. Ghislaine Maxwell Justice Department Meetings19ABC News. Deputy AG Blanche Meets With Ghislaine Maxwell
Her attorney, David Oscar Markus, said Maxwell was asked about roughly 100 different people and “didn’t hold anything back.” He described the arrangement as involving “no asks and no promises,” while acknowledging Maxwell “would welcome any relief.”20Axios. Epstein Maxwell Limited Immunity21NPR. Todd Blanche Epstein Ghislaine Maxwell22U.S. Senate Committee on the Judiciary. Letter to DOJ Regarding Maxwell Transfer The Second Circuit had affirmed her conviction in September 2024, and the Supreme Court declined to hear her appeal in October 2025.23The Guardian. Ghislaine Maxwell Supreme Court Appeal24SCOTUSblog. Supreme Court Declines to Hear Ghislaine Maxwell’s Appeal
The arrangement captures the character of limited immunity: a bounded exchange that protects the words you give, conditioned on truthfulness, offering no guarantee about anything else — including, in Maxwell’s case, her sentence.