OPINION OF THE COURT
On this appeal we must consider whether the government’s grant of use and derivative use immunity (use-fruits immunity) to the spouse of a witness is sufficient to defeat the witness’s privilege against adverse spousal testimony. This is a question of first impression for this court in the context in which it is presented.
I.
A witness before a grand jury who asserted her privilege not to testify as a witness against her husband in a criminal prоceeding appeals from the contempt order entered by the district court. The witness is the wife of John Doe 2, who is not the target but is a subject of a grand jury investigation.
In order to secure the testimony of the spouse-witness, whom it had subpoenaed, the district court, at the request of the government, granted the witness personal immunity under 18 U.S.C. § 6002 and 6003. The witness appeared before the grand jury and answered only preliminary questions, refusing to answer the bulk of the questions, and invoked the adverse spousal testimonial privilege. That day the grand jury issued a subpoena duces tecum requiring the witness to provide tapes of conversations between the witness’s husband and others which she illegally recorded. 1 Nonetheless, the witness again asserted her spousal testimonial рrivilege before the grand jury and refused to answer various questions on the ground that to do so would force her to be a witness against her husband in a criminal proceeding.
The matter came to issue when the witness filed a motion to quash the subpoena on the basis of the privilege. On the same day, the government filed a motion to compel the witness’s testimony and supplied an affidavit by the Assistant United States Attorney in charge of the grand jury investigation in which he promised the witness that the government would give use-fruits immunity to her husband in exchange for her testimony. Specifically, the government promised that it would “not use the testimony of [the witness spouse] or the fruits thereof in any way, either directly or indirectly, in any criminal proceeding against her husband ... [and] the United Stаtes will not present to this grand jury an indictment in which [her husband] is named as a defendant.” App. at 50. The government also represented in papers *1085 filed with the court that “in the event that a separate grand jury indicted [the husband], the government would bear the burden of establishing that the evidence it used to indict [the husband] and the evidence it would use at [the husband’s] trial were derived from legitimatе sources wholly independent of [the witness’s] testimony and production of the tapes.” App. 59.
In support of its motion, the government argued that immunizing the witness’s husband from any adverse effects of her testimony necessarily made inapplicable the asserted privilege. The district court denied the motion to quash and granted the government’s motion to compel the witness’s testimony, with the exception of answers or material that would reveal confidential attorney-client or marital communications. As to the spousal privilege, the court agreed that the government’s promise not to use the testimony against the husband sufficiently insulated the witness’s spouse so as to overcome the spousal privilege.
The witness appeared before the grand jury the next day but still refused to testify or produce the subpoenaed material, asserting her privilege against adverse spousal testimony and her marital communications privilege. The parties stipulated to the record, and the district court found the witness to be in contempt, but stayed imposition of sanctions pending this appeal.
II.
Rule 501 of the Federal Rules of Evidence provides, in relevant part, that:
Except as otherwise required by the Constitution of the United States or provided by Act of Congress or in the rules proscribed by the Supreme Court pursuant to statutory authority, the privilege of a witness ... shall be governed by the principles of the common law as they may be interpreted by the courts of the United States in the light of reason and experience.
Federal courts have recognized two kinds of marital privilege: the privilege that protects confidential marital communications and the privilege that protects a witness from testifying against his/her spouse. It is only the latter privilege that is now before this court.
It is, we note at the outset, a privilege that has been sharрly criticized by the Supreme Court of the United States. In
Trammel v. United States,
The specific question in
Trammel
was whether a criminal defendant may invoke the privilege against adverse spousal testimony so as to exclude the voluntary testimony of his wife. In the course of its “all-but-unanimous opinion,”
id.
at 53,
The
Trammel
Court held that only the witness spouse, not the non-witness spouse, could invoke the privilege against adverse spousal testimony.
See id.
at 53,
The district court here relied on the government’s promise of use-fruits immunity in holding that the non-witness spouse would be adequately insulated from the effects of the witness spouse’s testimony. The witness argues on appeal that because the mere utterance of hеr testimony, regardless of the criminal consequences, would adversely affect marital harmony, the government’s promise not to use her testimony against her husband is insufficient to overcome the spousal testimonial privilege. She asserts that the privilege involves “a basic right to refuse to provide testimony that implicates [a spouse].” Appellant’s Reply brief аt 2. Citing
Trammel,
This court has never suggested that the privilege is so broad as to protect any testimony at all by a spouse. For example, in
United States v. Fields,
Nor are we рersuaded by the witness’s argument in this case that she can assert the privilege despite the promise of use-fruits immunity. The grant by the government of use-fruits immunity is a well-established prosecutorial tool to compel testimony that is otherwise privileged. Although the constitutional guarantee against self-inciimination is the most important of privileges and “reflects a complex of оur fundamental values and aspirations, and marks an important advance in the development of our liberty,”
Kastigar v. United States,
Kastigar
built upon the earlier holding of the Court in
Ullmann v. United States,
The witness’s argument that her spousal testimonial privilege protects the very act of testifying, regardless of whether the government could use the information to prosecute her husband, overlooks the significance of adversity in determining the scope of the
*1087
privilege. Courts have consistently recognized that the privilege only applies to testimony that is “adverse” to the other spouse.
See, e.g., United States v. Van Cauwenberghe,
We thus hold that once the government grants immunity that eliminates the possibility that the testimony will be used to prosecute the witness’s spouse, the witness may no longer invoke the testimonial privilege.
2
This is the position adopted by all courts of appeal which have addressed this issue. In
United States v. Doe,
In
In re Snoonian,
In recognizing that the grant of immunity will defeat the adverse spousal testimonial privilege, we merely make explicit that which was implicit in our earlier decisions. In
In re Grand Jury (Malfitano),
Two years later in
In re Grand Jury Matter,
In our analysis of whether this government promise was sufficient protection оf the spousal testimonial privilege, we explained that in
Malfitano
“[b]y implication we suggested that if the Government ‘sever(ed) the husband’s indictment from that of the other defendants to ensure that the grand jury does not use the appellant’s testimony against her husband,’ the privilege might thereby be respected.”
Id.
at 692 (quoting
Malfitano,
However, we found that the government’s promise not to present an indictment to this particular grand jury was inadequate to preserve the integrity of the privilege against adverse spousal testimony because the only change from the Malfitano undertaking was that “the impact of the spouse’s testimony is delayed,” as the wife’s “testimony is sought with the expectation that it may lead to his indictment by a subsequent grand jury.” Id. at 693.
In the case before us now, the government makes the promise that the witness’s testimony cannot be used directly or indirectly in order to indict her husband either before the present grand jury or a future grand jury. This is essentially the offer of broad use-fruits immunity that was made and then withdrawn in In re Grand Jury Matter. See id. at 690. This promise is broad enough to overcome the concerns raised in Malfitano that the government not use the spouse’s testimony to indict before the existing grand jury, as well аs the concerns raised in In re Grand Jury Matter that the testimony not be used to indict in any future proceeding.
The witness, asserts that the principal rationale for the privilege would be undermined by the very act of testifying, regardless of its incriminating impact. Taking the witness’s argument to its logical conclusion, even transactional immunity .would be insufficient, because the harm to be avoided occurs аt the moment of the witness’s testimony, regardless of the lack of any potential adverse legal consequences to the spouse flowing from that testimony.
But no court has suggested the privilege sweeps that broadly. Indeed, as we explained in
Malfitano,
the rationale for the privilege is “that it protects the marriage from the discord that occurs when one spouse testifies against the other.”
The Supreme Court rejected an argument similar to the witness’s in the Fifth Amendment context in
Kastigar.
There the Court explained that the grant of immunity must be
*1089
coextensive with the privilege, but need not be broader.
See Kastigar,
In summary, in the case before us the government promised the witness that it would not use her testimony, or the fruits thereof, in any criminal proceeding against her husband or seek an indictment before the same grand jury before which she was testifying. The government has undertaken the burden of showing the independent source of any evidence it uses should it subsequently indict the witness’s husband. This use-fruits immunity is sufficient in the Fifth Amendment context to defeat the privilege against self-incrimination,
see Kastigar,
III.
For the reasons set forth we will affirm the district court’s order holding the witness in contempt for refusing to answer questions before the grand jury and continuing to assert her spousal privilege even though the government had promised that it would not use her testimony or the fruits thereof in any criminal proceeding against her husband.
Notes
. All parties agree that these recordings are "testimony" and are subject to the adverse spousal testimonial privilege. The non-witness spouse and the grand jury target have also moved to quash the subpoena
duces tecum
on different grounds. Their motions are the subject of a separate appeal in a related case in this court,
In re Grand Jury,
. Judge Aldisert does not join in this one sentence of the opinion, and adds this concurring statement: "I object to the sweep of this statement because it goes beyond the facts in this case. Being an unreconstructed follower of the Roscoe Pound trаdition that a holding in a case announces a specific legal consequence attached to a definite state of facts, I prefer that this sentence read: ‘We thus hold that under the facts of this case, in which the government’s specific grant of immunity eliminates the possibility that the testimony will be used to prosecute the witness's spouse, the witness may no longer invoke the testimonial privilege’. ”
