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Military Rules of Evidence: A Court Martial Defense Guide

If you are facing a court martial, the Military Rules of Evidence decide what the panel hears about you. Whether your statement to CID, NCIS or OSI comes in. Whether the contents of your phone come in. Whether the government can tell the panel about something you did years ago. Whether your lawyer can show the panel why the accuser has a reason to lie.

This guide covers the rules we fight over most often: statements, searches, other acts, the sexual offense rules, privileges, experts and hearsay. For each one, we explain what the rule says and how it has played out in cases we have tried.

Where the rules come from

The Military Rules of Evidence are Part III of the Manual for Courts-Martial. The current edition is the 2024 edition. In December 2024, the President amended Rule 513 by Executive Order 14130. That change is not printed in the 2024 Manual, so the two have to be read together. The Joint Service Committee on Military Justice has published further proposed changes for comment, most recently in October 2026. Proposed changes do not take effect until the President signs them.

Most of the military rules track the Federal Rules of Evidence. When a federal rule is amended, the parallel military rule changes automatically 18 months later unless the President acts otherwise. The privilege rules are the main exception. The President writes those for the military separately (Mil. R. Evid. 1102).

Most evidence fights happen before trial, and the deadlines are strict:

  • A motion to suppress a statement or the results of a search has to be made before you enter a plea. If it is not, it is waived unless the military judge finds good cause (Mil. R. Evid. 304(f), 311(d)).

  • A Rule 412 motion and a Rule 513 motion have to be filed at least five days before pleas.

  • The government has to disclose Rule 413 and 414 evidence at least five days before pleas, and it has to give written notice of Rule 404(b) evidence before trial.

Statements: Article 31, Rule 304 and Rule 305

The government's best evidence is often the accused's own words.

Article 31(b) of the UCMJ says that no person subject to the code may interrogate an accused or a suspect, or ask him for any statement, without first telling him three things: the nature of the accusation, that he does not have to make any statement, and that any statement he makes may be used as evidence against him at a court martial. A statement obtained in violation of Article 31 cannot be received in evidence against him (Article 31(d)).

Article 31(b) does not give you a right to a lawyer. That right comes from Rule 305. If you are questioned in custody and you ask for a lawyer, questioning has to stop until counsel is present (Mil. R. Evid. 305(c)(2), (c)(4)). Once charges have been preferred, the same protection covers law enforcement questioning about those charges if you ask for counsel or already have one (305(c)(3)).

Rule 304 enforces both. A statement taken in violation of Article 31 or the Fifth Amendment, or through coercion, unlawful influence or unlawful inducement, is involuntary. On a timely defense motion, the statement stays out, and so does the evidence derived from it (Mil. R. Evid. 304(a)). Even a voluntary confession cannot be considered against you unless the government offers independent evidence that tends to show it is trustworthy (304(c)).

You may decline the interview. You may ask for a lawyer.

In a 2023 Navy case at Naval Station Norfolk, our client was facing a general court martial on Article 120b charges based on a report made about five years after the alleged conduct. The government had no physical or corroborating evidence. It had his NCIS interview. During that interview he said, "I do need a lawyer for this though, I think." The agents kept questioning him. When a lawyer assigned to him in an earlier, unrelated matter called NCIS during the interrogation, the agent sent the call to voicemail. Tim Bilecki traveled to Norfolk for the suppression hearing. The military judge suppressed the entire interview and found that NCIS had "blatantly violated" his request for counsel. The government appealed. The Navy-Marine Corps Court of Criminal Appeals affirmed the ruling, and the government dismissed the charges.

If you are under investigation now, read what to expect when you are under military investigation before you talk to anyone.

Searches and Seizures: Rules 311 to 316

Rule 311 is the military exclusionary rule. Evidence from an unlawful search or seizure by a person acting in a governmental capacity stays out if three things are true. The defense makes a timely motion. The accused had a reasonable expectation of privacy in what was searched, or a legitimate interest in what was seized. And excluding the evidence would meaningfully deter future unlawful searches, with that benefit outweighing the cost to the justice system (Mil. R. Evid. 311(a)).

The rule has exceptions. Unlawfully obtained evidence can still be used to contradict the accused's own testimony, when it would have been discovered anyway, or when investigators relied in good faith on a search authorization (311(c)).

Rules 312 through 316 decide whether a search was lawful in the first place:

  • Rule 312 covers body views and intrusions, including blood draws.

  • Rule 313 covers inspections and inventories. An inspection is an examination ordered as an incident of command to ensure security, military fitness or good order and discipline. An examination whose primary purpose is to get evidence for a court martial is not an inspection.

  • Rule 314 covers searches that do not require probable cause, including consent searches. You can limit your consent in time, place or property, and you can withdraw it at any time.

  • Rule 315 covers probable cause searches. A search authorization must be based on probable cause and issued by an impartial commander, military judge or military magistrate.

  • Rule 316 covers seizures, including property in plain view.

Most of the searches we fight today are phones, cloud accounts and email. The questions are the same ones you would ask about a barracks room: who authorized the search, on what facts, and whether the agents stayed inside what was authorized.

In a 2023 Air Force case tried at RAF Mildenhall, we argued that investigators had search authority tied to a co-accused and used it to go through our client's Yahoo account history from end to end. The military judge agreed and suppressed the evidence. The government appealed, won, and put the evidence back in the case. Even though the government won the appeal, the litigation changed the case. It told the prosecution that every search, login and attribution claim was going to be fought, and we tried it that way through verdict.

At Fort Drum in 2025, the CID affidavit for the search of our client's phone quoted the text messages from the critical window and left out about half of them. Patrick Eller, the defense digital forensic examiner, pulled the full record. The military judge denied our motion to suppress. The omission was now on the record, and so was the affiant's credibility.

Other Acts: Rule 404(b)

Rule 404(b) bars evidence of another crime, wrong or act when it is offered to show that you have a certain character and acted in line with it on the charged occasion. The government can still offer that evidence for another purpose, such as motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, or lack of accident (Mil. R. Evid. 404(b)(1), (2)). The trial counsel has to give written notice before trial that identifies the evidence, the purpose, and the reasoning behind the purpose (404(b)(3)).

Before the evidence comes in, the military judge asks three questions. Does the evidence reasonably support a finding that the accused did the other act? Does it make a fact of consequence more or less probable? Is its probative value substantially outweighed by the danger of unfair prejudice under Rule 403? If the evidence fails any one of the three, it stays out.

The government's notice tells us its theory. We hold the government to the purpose it gave, and we attack each of the three questions. In a 2024 Air Force special court martial at Osan Air Base, the government wanted to use a sexual video and a recording from a separate relationship to argue that an alleged touching on a night out was sexual, not a drunken accident. We moved in limine, and the military judge excluded both for that purpose. The judge acquitted on one charge and convicted on the others. The sentence was 50 days of confinement, reduction to E-5 and a reprimand, with no punitive discharge. An administrative separation board later retained our client.

The Sexual Offense Rules: Rules 412, 413 and 414

Three rules apply only in sexual offense cases.

Rule 412: the rape shield rule

In any proceeding involving an alleged sexual offense, evidence offered to prove that the alleged victim engaged in other sexual behavior, or to prove the alleged victim's sexual predisposition, is generally inadmissible (Mil. R. Evid. 412(a)). There are three exceptions (412(b)):

  1. specific instances of the alleged victim's sexual behavior, offered to prove that someone other than the accused was the source of semen, injury or other physical evidence;

  2. specific instances of sexual behavior with the accused, offered by the accused to prove consent or offered by the prosecution; and

  3. evidence whose exclusion would violate the accused's constitutional rights.

Most of these motions are fought under the third exception. Military courts have long recognized that an alleged victim's sexual behavior can be admissible when it shows a motive to fabricate, such as an affair the accuser needed to hide.

The party offering the evidence has to file a written motion at least five days before pleas. The military judge holds a closed hearing, and the alleged victim has the right to attend and be heard, including through a Special Victims' Counsel. Evidence offered under the first two exceptions must also pass a balancing test: its probative value has to outweigh the danger of unfair prejudice to the alleged victim's privacy (412(c)). The alleged victim may petition the Court of Criminal Appeals if the victim believes a Rule 412 ruling violates the victim's rights (Article 6b(e)).

A good Rule 412 motion shows the panel why the allegation was made.

  • Schofield Barracks, 2021. The alleged conduct was at Torii Station, Okinawa, and the general court martial was tried at Schofield Barracks, Hawaii. The government charged an Army Sergeant with sexual assault, extortion, battery, domestic violence, stalking and indecent language. His wife had been in an ongoing relationship with another service member during the same months as the charged conduct. Her Special Victim Counsel and the prosecution both fought our Rule 412 motion. After a closed hearing, the military judge granted it. The panel heard about the affair and its timing, and it acquitted our client of every charge.

  • Fort Stewart, 2023. A Sergeant Major was facing a general court martial on two Article 120 abusive sexual contact specifications. We won a Rule 412 motion to cross examine on the romantic relationship between the alleged victim and the reporting witness. We also won a new Article 32 hearing, because the hearing officer had cut off two defense witnesses. Seven days later, the charges were withdrawn and dismissed, and he retired at grade.

  • Fort Drum, 2025. The military judge granted two of our Rule 412 motions under the constitutional exception. The first concerned the alleged victim's prior abusive relationship with a married Soldier, which gave her a documented motive to fabricate to the friend she first told. The second concerned her sexual relationship with that same friend. Days before trial, the charges were withdrawn and dismissed.

We do not win every Rule 412 motion. At Camp Humphreys in 2024, the military judge denied our motion to admit a prior consensual relationship between our client and the first alleged victim. We tried the case on cross examination instead: the motive behind the report, barracks CCTV that showed about twenty minutes instead of the "hour or two" she described, and an investigation with no phone download, no DNA collection and no interview of her boyfriend. The panel acquitted on every charge and specification.

Rules 413 and 414: propensity evidence

In a court martial for a sexual offense, Rule 413 allows the military judge to admit evidence that the accused committed another sexual offense. In a case charging child molestation, Rule 414 does the same for other offenses of child molestation. The panel may consider this evidence on any matter to which it is relevant (Mil. R. Evid. 413(a), 414(a)). That includes propensity, the inference that Rule 404(b) otherwise forbids.

The government must disclose the evidence, including witness statements or a summary of the expected testimony, at least five days before pleas, or later if the judge allows it for good cause (413(b), 414(b)). Before admitting it, the judge must find that the accused is charged with a qualifying offense, that the evidence is evidence of another qualifying offense, and that it is relevant. The judge then weighs it under Rule 403. If it comes in, the panel is told that the other offense, on its own, is not enough to convict.

We look at whether the other act was ever an offense, whether the proof that it happened holds up, and whether it looks enough like the charged act to tell the panel anything. Then we fight the Rule 403 balance.

For more on these charges, see our page on military sexual assault defense and our guide to Article 120.

Privileges: Rules 513 and 514

Rule 513: the psychotherapist and patient privilege

As amended in December 2024, Rule 513(a) gives a patient a privilege to refuse to disclose, and to prevent anyone else from disclosing, a confidential communication, including records of such communications, made between the patient and a psychotherapist or an assistant to the psychotherapist, in a case arising under the UCMJ, if the communication was made for the purpose of diagnosis or treatment of the patient's mental or emotional condition (Executive Order 14130).

That amendment answered a 2022 decision. The Court of Appeals for the Armed Forces held in United States v. Mellette that diagnoses and treatments contained in medical records were not themselves uniformly privileged under Rule 513. The December 2024 amendment brought records of the communications inside the privilege.

The exceptions are listed in the rule (513(d)). They apply when the patient is dead; when the communication is evidence of child abuse or neglect; when law or service regulation imposes a duty to report; when the psychotherapist believes the patient is a danger to any person; when the communication contemplated a future crime or fraud; when disclosure is necessary to ensure the safety and security of military personnel, property, classified information or the mission; and when the accused offers evidence of his own mental condition. The list does not include an exception for evidence that is constitutionally required.

The motion is due at least five days before pleas, the hearing is closed, and the patient has the right to be heard. Before the military judge will even review records privately, the defense has to show four things by a preponderance of the evidence: a specific, credible factual basis showing a reasonable likelihood that the records contain or lead to admissible evidence; that one of the listed exceptions applies; that the information is not merely cumulative; and that the defense made reasonable efforts to get the same information from sources that are not privileged (513(e)).

Rule 514: the victim advocate and victim privilege

Rule 514 protects confidential communications between an alleged victim of a sexual or violent offense and a victim advocate or Department of Defense Safe Helpline staff, made for the purpose of facilitating advice or assistance to the alleged victim. It has its own list of exceptions.

Privilege motions are won on facts that are not privileged: the timeline, the witnesses, the messages, and what the accuser has already told other people. That is where we build the showing. As with Rule 412, the alleged victim can seek review of a Rule 513 or 514 ruling in the Court of Criminal Appeals (Article 6b(e)).

Experts: Rule 702

A qualified expert may give an opinion if the expert's specialized knowledge will help the panel understand the evidence or decide a fact in issue, the testimony is based on sufficient facts or data, it is the product of reliable principles and methods, and the expert reliably applied those methods to the facts of the case (Mil. R. Evid. 702).

The defense can request an expert witness or an expert consultant. After referral, the defense can take that request to the military judge, and a request for a consultant can be made ex parte. The judge decides whether an expert witness is relevant and necessary, or whether a consultant is necessary for an adequate defense (R.C.M. 703(d)).

In sexual assault, child abuse and digital evidence cases, the government's case often rests on its own experts: the sexual assault nurse examiner, the forensic interviewer, the digital forensic examiner, the DNA analyst. We go after the method, the data and the conclusions, and we bring our own experts when the case needs them. At Fort Drum, Patrick Eller found the texts the CID affidavit left out, and Dean Wideman, the defense DNA expert, showed that the pattern in the government's own DNA work did not line up with the alleged victim's account. In the 2023 Air Force case, the defense team included a digital forensic examiner and a forensic psychiatrist.

Hearsay: Rules 801 to 807

Hearsay is a statement the declarant did not make while testifying at the current trial or hearing, offered to prove the truth of what it asserts (Mil. R. Evid. 801(c)). It is inadmissible unless a federal statute that applies to courts martial or the rules allow it (802).

Some statements are not hearsay at all. Your own statements, offered by the government, are not hearsay (801(d)(2)). Neither is a witness's prior consistent statement offered to rebut a claim that the witness recently fabricated the story or acted from a recent improper influence or motive (801(d)(1)(B)). That is one reason the timing of a first report matters so much.

The exceptions we see most often are excited utterances (803(2)); statements made for and reasonably pertinent to medical diagnosis or treatment, which is how the government often offers statements made to a sexual assault nurse examiner (803(4)); statements by a declarant who is unavailable (804); and the residual exception, which requires written notice before trial (807).

Even when an exception applies, the Constitution can keep the statement out. Under the Confrontation Clause, a testimonial statement from a witness who does not testify at trial is admissible only if the witness is unavailable and the accused had a prior opportunity to cross examine (Crawford v. Washington, 541 U.S. 36 (2004)).

We map every out of court statement the government intends to offer: who heard it, when, and why it was made. Those rulings often decide whether the government can prove its case without the accuser, or whether the accuser's account reaches the panel through three other witnesses.

The Rules at the Article 32 Hearing

Most of the rules do not apply at the Article 32 preliminary hearing, and the hearing officer may consider hearsay. Only a few do: Rules 301 through 303 and Rule 305, Rule 412(a), and the privileges, with some exceptions (R.C.M. 405(j)(1)). In a sexual offense case, the alleged victim's other sexual behavior comes in at the Article 32 only if it would be admissible at trial under the first two Rule 412 exceptions and it is relevant, not cumulative, and necessary to the hearing (405(j)(2)). The constitutional exception does not apply at that stage.

How We Prepare the Evidence Fight

We start on the evidence the day we are retained. We read the interrogation recording against the warnings. We read the search authorization against what the agents actually took. We look for the relationship, the money or the custody fight that explains why the allegation was made, and we decide early whether a Rule 412 or 513 motion is worth filing, because those motions are due five days before pleas and they are only as good as the facts behind them. We use the Article 32 to lock in testimony. Then we try the case with whatever the rulings let in and keep out.

Since 2003, we have defended service members in every branch, worldwide, and we have taken more than 250 courts martial to verdict. If you are under investigation or facing charges, schedule a consultation.

Frequently Asked Questions

What are the Military Rules of Evidence? They are the rules that decide what evidence a court martial may hear. They are Part III of the Manual for Courts-Martial, currently the 2024 edition, as amended by Executive Order 14130 in December 2024.

Are the Military Rules of Evidence the same as the Federal Rules of Evidence? Most of them track the federal rules, and federal amendments flow into the military rules after 18 months unless the President acts otherwise. The military rules add Article 31 rights warnings, commander search authorizations and inspections, and privileges written for the military, including Rules 513 and 514.

Can my statement to CID, NCIS or OSI be suppressed? It can be if it was taken in violation of Article 31, the Fifth Amendment or Rule 305, or through coercion, unlawful influence or unlawful inducement. The motion has to be made before you enter a plea.

Can the prosecution use my past against me? Not to show that you are the kind of person who commits the offense (Rule 404(b)). In sexual offense and child molestation cases, Rules 413 and 414 allow the government to offer other offenses for propensity, subject to disclosure, findings by the judge and the Rule 403 balance.

Can my lawyer ask about the accuser's sexual history? Generally no. Rule 412 bars it unless an exception applies, including when excluding it would violate your constitutional rights, such as evidence of a motive to fabricate. The motion is due at least five days before pleas.

Can the defense get the accuser's mental health records? Rarely. Since December 2024, Rule 513 protects records of psychotherapist communications as well as the communications themselves, and the defense must make a specific factual showing before the judge will review records privately.

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