Yes. Military Rule of Evidence (MRE) 504 recognizes a spousal privilege, and in many situations a witness-spouse may decline to testify against the accused spouse. But the answer is more textured than a simple yes, because MRE 504 actually contains two distinct privileges that work very differently, and because the rule carves out specific exceptions that strip the privilege away in defined circumstances. Understanding who holds each privilege, what it covers, and when it disappears is essential to predicting whether a spouse can be compelled to take the stand at a court-martial.
Two separate privileges within one rule
MRE 504 is best understood as housing two related but independent protections.
The first is the spousal incapacity privilege, sometimes called the testimonial privilege. It allows a person to refuse to testify against his or her spouse at all in a criminal proceeding. This privilege belongs to the witness-spouse alone. That allocation tracks the Supreme Court’s decision in Trammel v. United States, which held that the witness-spouse, and not the accused, holds the privilege to refuse to give adverse testimony. The practical consequence is that the accused cannot block a willing spouse from testifying, and a reluctant spouse can choose to testify or not. The incapacity privilege also exists only during the marriage; once the marriage is dissolved, this privilege ends.
The second is the confidential marital communications privilege. It protects confidential communications made between the spouses during a valid marriage. Unlike the incapacity privilege, the communications privilege may be asserted by the spouse who made the communication, or by the other spouse on his or her behalf, and it survives the marriage. So even after a divorce, words spoken in confidence during the marriage can remain privileged.
The two privileges also differ in scope. The incapacity privilege, while it lasts, can keep the witness-spouse off the stand entirely. The communications privilege is narrower: it shields only confidential communications, not observations of conduct. A spouse who watched the accused do something may still be required to describe what was seen, because acts are not communications.
What counts as a confidential communication
For the communications privilege to apply, three things must generally be true. There must be a communication. It must have been intended to be confidential. And it must have passed between persons who were married and not separated at the time. A communication made in the known presence of a third party is not confidential, and the privilege does not attach. This is why the surrounding circumstances of a marital statement matter so much in litigation over the privilege.
The exceptions that defeat the privilege
MRE 504 does not protect every marital relationship in every case. The rule sets out specific exceptions, and where one applies, the spouse can be compelled to testify or the communication can be admitted.
The most important exception covers crimes by one spouse against the other or against a child. The privilege does not apply when the accused is charged with a crime against the person or property of the other spouse, or against a child of either spouse. This exception is what allows prosecution of domestic violence and child abuse cases even when the victim-spouse would prefer not to testify. Military courts have also treated certain offenses, such as adultery, as crimes against the other spouse for this purpose, removing the privilege in those cases.
A second exception addresses joint criminal activity. Where both spouses were substantial participants in the illegal activity, communications between them about that joint criminal conduct are not protected marital communications. This prevents spouses from using the marriage as a shield for crimes they committed together.
A point of contrast with civilian federal practice is worth noting. Privileges in the military system are specifically enumerated, and the only exceptions are those the rule expressly authorizes. Some federal civilian courts have recognized a broader joint-participant exception through case law. In the military, the exceptions are limited to those written into MRE 504, which makes the text of the rule the controlling authority rather than evolving common law.
How a spouse invokes the privilege in practice
When the government calls a spouse as a witness, the question of privilege is litigated before the testimony is given. The witness-spouse asserting incapacity must do so personally, because that privilege is the witness’s to hold or waive. For the communications privilege, either spouse may raise it as to the protected statements. The military judge then determines whether a valid marriage existed at the relevant time, whether the communication was confidential, and whether any exception applies. If an exception applies, the privilege gives way and the spouse may be required to testify within that scope.
Practical takeaways
A witness-spouse generally may invoke spousal privilege in a court-martial under MRE 504, but the outcome depends on which privilege is at issue and whether an exception controls. The incapacity privilege lets a current spouse decline to testify at all, belongs to the witness, and ends with the marriage. The communications privilege protects confidential marital communications, can be asserted by either spouse, and survives divorce, but it does not cover observed acts. And in cases involving alleged crimes against the spouse or a child, or joint criminal activity, the privilege does not apply, and the spouse can be compelled to testify. Anyone facing this situation should expect the issue to be resolved by the military judge before the witness ever answers a substantive question.
Disclaimer
This article is provided strictly for general educational and informational purposes. It is intended to explain how the Uniform Code of Military Justice (UCMJ), the Rules for Courts-Martial, the Military Rules of Evidence, and related military administrative processes work as a matter of public legal education. It does not constitute legal advice, a legal opinion, or a recommendation about any particular case, and it is not a substitute for advice from a qualified military defense attorney who can evaluate the specific facts and command, service, and jurisdictional circumstances involved.
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