Yes. A written sworn statement can be suppressed if the questioner was required to give Article 31 warnings and failed to do so before obtaining the statement. This is one of the most consequential protections in military justice, and it applies to the kind of written, signed, and sworn statement that service members are routinely asked to provide to investigators and commanders. Understanding when the warning is required, and what happens when it is skipped, is essential for anyone facing a military investigation.
What Article 31 Requires
Article 31(b) of the Uniform Code of Military Justice, codified at 10 U.S.C. 831(b), states that no person subject to the code may interrogate, or request any statement from, an accused or a person suspected of an offense without first informing them of the nature of the accusation, advising them that they do not have to make any statement regarding the offense, and advising them that any statement made may be used as evidence against them in a trial by court-martial. These warnings cover the right to silence, the nature of the suspected offense, and the use of the statement. In practice the warning also includes advice about the right to counsel under Military Rule of Evidence 305.
The remedy for a violation is built into the statute. Article 31(d) provides that no statement obtained from any person in violation of the article, or through coercion, unlawful influence, or unlawful inducement, may be received in evidence against them at a court-martial. A written sworn statement is a statement for this purpose. If the statement was obtained without a required warning, it is treated as involuntary and is subject to exclusion.
The Military Rules of Evidence Make the Remedy Concrete
Military Rule of Evidence 305 codifies the warning requirement and ties it to the suppression remedy in Military Rule of Evidence 304. Under these rules, a statement obtained in violation of the warning requirement is deemed involuntary. Military Rule of Evidence 304 then provides that, upon a timely motion or objection by the defense, an involuntary statement from the accused, and evidence derived from it, is excluded from evidence. The definition of an involuntary statement expressly includes a statement obtained in violation of Article 31.
This framework means suppression is not automatic in the sense of happening on its own. The defense must raise the issue. A timely motion to suppress is required, and the prosecution then bears the burden of establishing that the statement is admissible, which includes proving that proper warnings were given or were not required.
When Were the Warnings Actually Required?
The critical wrinkle is that Article 31 warnings are not required before every conversation. Two conditions generally must be present. First, the person doing the questioning must be subject to the UCMJ and acting in an official law enforcement or disciplinary capacity. Second, the person being questioned must be a suspect or an accused at the time. Military appellate courts assess all the facts and circumstances at the time of the interview to decide whether the questioner was acting, or could reasonably be considered to be acting, in an official law enforcement or disciplinary capacity, judged from the standpoint of a reasonable person in the suspect’s position.
This is why a written sworn statement taken by a military criminal investigator, a commander conducting an inquiry, or a noncommissioned officer asking questions for disciplinary purposes typically triggers the warning requirement once the person is suspected. By contrast, questions asked in a purely administrative or operational context, with no law enforcement or disciplinary purpose, may not trigger Article 31 at all. The form of the statement, written and sworn, does not change the analysis. What matters is the purpose of the questioning and the status of the person questioned.
How Suppression Plays Out
When the defense moves to suppress a written sworn statement on Article 31 grounds, the military judge holds a hearing outside the presence of the members. The judge examines who asked the questions, in what capacity, whether the service member was a suspect, whether a warning was given, and whether the statement was voluntary. The government must show, by a preponderance of the evidence, that the statement is admissible.
If the judge finds that a required warning was not given, the written sworn statement is suppressed and cannot be used in the government’s case against the accused. Suppression can also reach evidence derived from the tainted statement, though derivative evidence questions are governed by additional rules and exceptions. A successful suppression motion can gut a prosecution that depended heavily on the accused’s own words.
Important Limits and Cautions
Several limits deserve emphasis. Suppression depends on a proper, timely objection, so the defense must preserve the issue. The remedy protects against use of the statement against the accused at court-martial; it is not a general declaration that no misconduct occurred. The government may still attempt to proceed on other untainted evidence. And there are recognized situations where warnings are not required, such as questioning that is genuinely not for law enforcement or disciplinary purposes, which is why each case turns on its specific facts.
Voluntariness is also a separate and overlapping concern. Even a statement preceded by perfect warnings can be suppressed if it was the product of coercion, unlawful influence, or unlawful inducement, because Article 31(d) and Military Rule of Evidence 304 reach involuntary statements regardless of the warning.
Bottom Line
A written sworn statement is fully subject to Article 31 protections. If a person subject to the UCMJ, acting in a law enforcement or disciplinary capacity, obtained the statement from a suspect or accused without the required warnings, the statement can be suppressed under Article 31(d) and Military Rules of Evidence 304 and 305. The defense must raise a timely motion, and the government must justify admission. Any service member who gave a sworn statement without being warned, or who is unsure whether warnings were properly given, should consult a defense counsel promptly so the issue can be evaluated and preserved.
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.
Reading this article, or contacting any website on which it appears, does not create an attorney-client relationship between the reader and any law firm, attorney, or author. Every court-martial, nonjudicial punishment action, administrative separation, and security-clearance matter turns on its own facts, the charged articles, the convening authority, the service branch, and the evidence, and outcomes vary widely from one case to another.
Military law also changes over time. The Military Justice Act of 2016 (effective January 1, 2019) and subsequent National Defense Authorization Acts renumbered and rewrote many punitive articles, revised the Article 32 preliminary hearing, and altered sentencing, clemency, and appellate procedures. Statutes, regulations, executive orders, the Manual for Courts-Martial, and decisions of the service Courts of Criminal Appeals and the Court of Appeals for the Armed Forces may have been amended, superseded, or reinterpreted after this article was written, and article numbers or procedures cited here may have changed.
For these reasons, no reader should act or decline to act based on this content without first consulting a licensed attorney experienced in military justice about their own situation. The author and publisher make no warranty, express or implied, as to the accuracy, completeness, timeliness, or current applicability of the information provided, and disclaim any liability for any action taken or not taken in reliance on it. If you are facing investigation, charges, or an adverse administrative action, time limits may apply, and you should seek qualified counsel promptly.