Federal Immunity Agreements: Protecting Yourself Before You Speak Under 18 U.S.C. § 6002
Talking to federal investigators without immunity is one of the most consequential decisions a person under investigation can make, and one of the most commonly misunderstood.
The assumption that cooperation will be rewarded, that telling the truth will protect you, or that declining to speak will look suspicious leads people to provide statements that become the foundation of their own prosecution.
Federal immunity agreements exist to change that dynamic.
Under 18 U.S.C. § 6002, the government has the authority to compel testimony from a witness who would otherwise invoke the Fifth Amendment, in exchange for a guarantee that the compelled testimony cannot be used against that witness in a subsequent criminal proceeding.
Understanding what immunity covers, what it does not cover, and how to negotiate its terms before saying a single word to a federal agent is the difference between a protected witness and an indicted defendant.
Eisner Gorin LLP can help you. Schedule your consultation by calling (818) 781-1570 or using the contact form here.
What Is Federal Statutory Immunity Under 18 U.S.C. § 6002?
18 U.S.C. § 6002 establishes the framework for use and derivative use immunity in federal proceedings. When a court order compels a witness to testify despite a Fifth Amendment objection, the statute guarantees that:
- The compelled testimony itself cannot be used against the witness in any criminal proceeding.
- No evidence derived from or obtained because of the compelled testimony can be used against the witness.
This is use and derivative use immunity. It is the floor of what the Constitution requires, established by the Supreme Court in Kastigar v. United States, 406 U.S. 441 (1972), which held that use and derivative use immunity is coextensive with the Fifth Amendment privilege and therefore sufficient to compel testimony.
What § 6002 immunity does not provide is transactional immunity, meaning it does not protect the witness from prosecution for the underlying conduct itself.
The government retains the right to prosecute the immunized witness using evidence gathered entirely independently of the compelled testimony.
The Two Types of Immunity: What They Cover and What They Don't
Understanding the distinction between the two immunity frameworks is essential before any discussion of cooperation begins.
Use and Derivative Use Immunity (Statutory, under § 6002):
- The compelled statement cannot be used against the witness directly.
- Evidence leads generated by the statement cannot be used against the witness.
- The government can still prosecute using evidence it gathered before the immunity order or through sources entirely independent of the testimony.
- This is the standard form of immunity the government offers.
Transactional Immunity:
- Provides complete protection from prosecution for any offense related to the subject matter of the testimony.
- Is not required by the Constitution and is not established by federal statute.
- Is occasionally negotiated as part of a cooperation agreement but requires explicit written agreement from the prosecuting office.
- Provides substantially broader protection than statutory immunity
The practical implication is significant. A witness who testifies under § 6002 immunity and later faces prosecution bears the burden of demonstrating that the government's evidence was gathered independently.
The government carries the burden of proving an independent source, but that burden is not always difficult to meet if the investigation was already well advanced before the testimony occurred.
What Is a Proffer Agreement and How Does It Differ from Immunity?
A proffer agreement, sometimes called a queen-for-a-day letter, is a separate mechanism that frequently precedes a formal immunity or cooperation agreement.
It is a written agreement between the defendant and the U.S. Attorney's office establishing limited conditions under which the defendant may provide information to the government.
Under a standard federal proffer agreement:
- The substance of what the defendant says during the proffer session generally cannot be used against them in the government's case-in-chief.
- The statements can be used to cross-examine the defendant if they testify at trial inconsistently with the proffer.
- The statements can be used if the defendant is later charged with making false statements during the proffer session.
- The government retains the right to pursue all leads generated by the proffer using independent evidence.
A proffer is not immunity. It is a structured conversation with limited protections designed to let both sides evaluate whether a cooperation agreement makes sense.
The risks are substantial. A poorly managed proffer session can provide the government with a roadmap to evidence it had not yet developed, generate inconsistency exposure, and foreclose defense strategies that would otherwise remain available.
Retaining counsel who has conducted federal proffer sessions and understands the specific U.S. Attorney's office's practices is not optional. It is the foundation of a safe proffer strategy.
How Are Immunity Agreements Negotiated?
Formal statutory immunity under § 6002 requires a court order, which the government obtains by applying to the district court after the Attorney General or a designated official authorizes the request for immunity.
In practice, however, most immunity arrangements in federal cases are negotiated between defense counsel and the prosecuting AUSA before any court application is made.
The negotiation process typically involves:
- Defense counsel approaching the AUSA with a proffer of what the client can offer, without disclosing the substance of the information.
- The government is evaluating whether the information is useful enough to warrant immunity.
- Negotiation of the scope of cooperation, the charges covered, and any additional protections beyond the § 6002 floor.
- Execution of a written cooperation or immunity agreement setting out the terms.
- In some cases, a proffer session preceding the formal agreement allows the government to assess the value of the information.
The scope of what is negotiable depends heavily on the strength of the government's existing case, the value of the information the client possesses, and the skill of defense counsel in presenting that value without prematurely disclosing it.
Frequently Asked Questions (FAQs)
What is a federal immunity agreement?
A federal immunity agreement is a legal arrangement in which prosecutors provide certain protections in exchange for testimony or cooperation during a federal investigation.
What does 18 U.S.C. § 6002 protect against?
Under 18 U.S.C. § 6002, compelled testimony and evidence derived from that testimony generally cannot be used against the witness in a criminal case.
What is the difference between use immunity and transactional immunity?
Use immunity prevents prosecutors from using a witness's testimony against them directly, while transactional immunity provides broader protection against prosecution for offenses related to the testimony.
What is a federal proffer agreement?
A federal proffer agreement, sometimes called a “queen for a day” agreement, allows a person to provide information to prosecutors under limited protections before formal cooperation decisions are made.
Can you still be prosecuted after receiving immunity?
Yes. Under use and derivative use immunity, prosecutors may still file charges if they can prove the evidence came from independent sources.
Should I speak with federal investigators without a lawyer?
No. Speaking with federal agents without experienced legal counsel can expose you to criminal liability, allegations of false statements, or unintended admissions.
Are verbal promises from federal agents legally binding?
Generally, no. Immunity agreements and cooperation protections should always be documented in a formal written agreement approved by the U.S. Attorney's Office.
Why is early legal representation important during immunity negotiations?
An experienced federal defense lawyer can evaluate the government's evidence, negotiate stronger protections, manage proffer sessions, and help reduce the risk of future prosecution.
Key Strategic Considerations Before Any Cooperation Discussion
Never Speak to Federal Agents Without Counsel
Federal agents are not required to advise targets or subjects of their right to counsel before a voluntary interview. Statements made voluntarily, without custodial compulsion, are admissible regardless of whether Miranda warnings were given.
Every voluntary statement to a federal agent may be charged as a false statement under 18 U.S.C. § 1001 if the government later determines the statement was inaccurate, even if the inaccuracy was unintentional.
Evaluate Independent Evidence Before Deciding to Cooperate
The value of immunity depends on how much independent evidence the government already has. If the government's case is already strong and the client's testimony adds marginal value, immunity may provide little practical protection.
If the government's case has significant gaps that the client's testimony would fill, the client's leverage in negotiating broader protections is substantially higher. That assessment requires a thorough, independent investigation before any discussion of cooperation begins.
Understand the Kastigar Burden
If the government prosecutes an immunized witness using evidence it claims was gathered independently, the witness can challenge the prosecution under Kastigar by demanding the government demonstrate that every piece of evidence it intends to use was obtained through sources completely untainted by the immunized testimony.
That challenge is easier to mount when defense counsel has documented the state of the government's investigation before the immunity testimony occurred.
Securing Transactional Immunity in a Federal Healthcare Fraud Investigation
A mid-level operations manager at a Southern California billing company received a grand jury subpoena for testimony in connection with a federal healthcare fraud investigation targeting the company's ownership.
The manager had direct knowledge of the billing practices under investigation but had not personally profited from or directed the conduct.
Defense counsel evaluated the government's position and concluded that the manager occupied a unique evidentiary position: she had documentary knowledge of communications between the owners and the billing team that the government had not yet obtained through subpoena.
That knowledge represented significant leverage. The pre-cooperation strategy proceeded in three stages:
- Independent evidence assessment: Counsel mapped the government's known evidence base through publicly available court filings in related proceedings and assessed how much of the client's knowledge the government could independently develop.
- Proffer of value without disclosure: Counsel approached the AUSA and represented, without revealing substance, that the client had direct documentary knowledge of communications establishing the owners' knowing direction of the billing scheme, evidence the government had not obtained and might not be able to obtain without cooperation.
- Transactional immunity negotiation: Based on the assessed value of the client's testimony, counsel negotiated not statutory use immunity but full transactional immunity covering all conduct related to the billing scheme, memorialized in a written agreement signed by the U.S. Attorney's office before any testimony was provided.
The client testified before the grand jury under full transactional immunity. The owners were indicted. The client was never charged, and her cooperation was not disclosed in any public proceeding.
What Happens If You Cooperate Without a Written Agreement?
Verbal assurances from federal agents or even AUSAs that cooperation will be rewarded are not enforceable.
Courts have consistently held that informal promises of leniency or non-prosecution made without written authorization from the U.S. Attorney's office do not bind the government.
Defendants who cooperate on the basis of oral assurances and are subsequently charged have very limited recourse.
Every immunity or cooperation arrangement must be memorialized in a written agreement, signed by an authorized representative of the prosecuting office, before any substantive information is provided. Anything less is not immunity. It is a conversation.
Facing Federal Investigation and Considering Cooperation?
Eisner Gorin LLP represents individuals navigating federal immunity negotiations, proffer agreements, and cooperation decisions in investigations involving financial crimes, healthcare fraud, public corruption, and complex white-collar matters nationwide.
When the question is whether to speak and what protections to secure before you do, the answer begins with experienced federal defense counsel who understands exactly what the government is offering, what it is not, and what you should demand before saying a single word.
Contact our offices today for a confidential consultation.