A federal agent and an Assistant U.S. Attorney sit across the table, and a physician who has just been served a grand jury subpoena or a civil investigative demand has to decide whether to talk. A proffer session is the mechanism federal prosecutors use to make that decision possible: a meeting, governed by a written proffer agreement, where the person under investigation gives prosecutors an account of what happened in exchange for a limited promise about how that account can be used. In healthcare fraud investigations, where Anti-Kickback Statute and Stark Law exposure often sit alongside criminal charges, the protection a proffer agreement provides is real, but it is far narrower than most physicians expect.
What a Proffer Session Is
A proffer session brings together the person under investigation, defense counsel, an Assistant U.S. Attorney (AUSA), and one or more federal agents, typically from the FBI or the Department of Health and Human Services Office of Inspector General (HHS-OIG). The government's purpose is to evaluate what the person knows. The defense's purpose is to test whether cooperation, a declination, or a negotiated plea is realistic before the government commits to an indictment. The session proceeds under a written proffer agreement, sometimes called a queen for a day letter, that sets the ground rules for what the government can and cannot do with what is said in the room.
The Protection a Proffer Agreement Provides
The standard proffer agreement commits the government to not using the person's own statements from the session in its case-in-chief if the matter goes to trial. That protection rests on a negotiated agreement, and it is considerably narrower than the formal use immunity a court can compel under 18 U.S.C. § 6002. Formal use and derivative use immunity, the standard the Supreme Court set out in Kastigar v. United States, 406 U.S. 441 (1972), requires the government to prove that any evidence it later uses against the witness came from a source wholly independent of the compelled testimony. A proffer agreement carries no such burden-shifting protection.
The Limits: Impeachment and the Leads Doctrine
Two carve-outs matter most. First, if the person is later indicted and testifies at trial in a way that is inconsistent with the proffer, the government can use the proffer statements to impeach that testimony, and some proffer letters permit use whenever any part of the defense is inconsistent with the proffer. Second, the agreement does not restrict derivative use. Prosecutors and agents remain free to run down every investigative lead the session generates and to use whatever independent evidence that produces at trial. A proffer session can end with the government's file stronger than it started, even though the proffer statements themselves never reach a jury.
A proffer agreement does not promise immunity, a declination, or a specific sentence. Every one of those decisions stays within the prosecutor's discretion.
Deciding Whether to Proffer in a Healthcare Fraud Investigation
The decision typically comes up after a grand jury subpoena (see Grand Jury Subpoenas in Healthcare Investigations) or a civil investigative demand (see Responding to a Civil Investigative Demand (CID)) has already put a physician or healthcare company on notice that the government is reviewing specific claims or billing codes. Healthcare fraud investigations often run on parallel tracks: a civil track built on the False Claims Act and a criminal track built on the federal healthcare fraud statute (see The Federal Healthcare Fraud Statute (18 USC 1347) Explained), the Anti-Kickback Statute, or Stark Law. A proffer made to resolve exposure on one track can create exposure on the other. What a proffer session accomplishes depends on what the government already has independent of the person's own account, how strong the underlying facts are, and whether the matter is more likely headed toward a declination, a civil resolution, or an indictment.
Why Early Legal Counsel Is Critical
It is critical that physicians and healthcare providers promptly retain experienced healthcare defense counsel upon receiving a subpoena, audit notice, investigative request, civil investigative demand, or any invitation to a proffer session. Early legal intervention can protect the provider's rights, ensure appropriate responses to government requests, avoid inadvertent admissions, preserve relevant defenses, and allow counsel to communicate with investigators on the provider's behalf. Delaying legal representation can significantly affect the outcome of a matter.
How Health Law Alliance Can Help
Health Law Alliance has handled 5,000+ matters across healthcare fraud investigations, PBM audits, and federal and state inquiries, including the proffer and cooperation decisions that shape whether a matter ends in a declination, a civil resolution, or an indictment. If you or your practice has been invited to a proffer session, or has already received a grand jury subpoena or civil investigative demand, contact us for a free, confidential consultation before you decide how to respond.
