Adjutant Evidence and Rebuttal in Massachusetts Self-Defense Cases

Massachusetts self-defense cases sometimes turn on who began the physical confrontation or who first used or threatened deadly force.

Under the Adjutant rule, a defendant may ask the judge to admit evidence of specific violent incidents that the alleged victim is reasonably alleged to have initiated. The rule also covers qualifying violent acts by a third party acting in concert with or to assist the alleged victim. The judge retains discretion over whether the evidence will be admitted.

Using Adjutant evidence can also permit a response from the prosecution. Under Commonwealth v. Morales, 464 Mass. 302 (2013), the Commonwealth may seek to rebut qualifying evidence about the alleged victim with specific incidents of the defendant’s prior violent conduct. That does not make the defendant’s entire criminal record admissible, and a conviction is not interchangeable with proof of a qualifying violent incident.

The analysis focuses on the particular incidents and the disputed issue they may help resolve. Massachusetts Rule of Criminal Procedure 14.3(c) requires timely notice, and the proffer needs an adequate evidentiary foundation. The judge must then apply the governing balancing test and give a precise limiting instruction. This is not a comparison of two criminal records.

The Adjutant First-Aggressor Rule

Evidence that a person acted violently on another occasion ordinarily cannot be used merely to show that the person probably acted the same way in the charged incident. Commonwealth v. Adjutant, 443 Mass. 649 (2005), created a focused exception for a defendant who raises self-defense and disputes the identity of the first aggressor. The court held, as a matter of common law, that a trial judge has discretion to admit specific incidents of violence that the alleged victim is reasonably alleged to have initiated. Adjutant, 443 Mass. at 664.

The Massachusetts Guide to Evidence states the current rule at § 404(a)(2)(B) (2026). Where the identity of the first aggressor or the first to use deadly force is in dispute, a defendant may offer evidence of specific incidents of violence allegedly initiated by the alleged victim, or by a third party acting in concert with or to assist the alleged victim, whether or not the defendant knew of them. The same subsection permits the prosecution to rebut with specific incidents of violence by the defendant.

The jury may use that evidence to decide who initiated the confrontation or who escalated it by first using or threatening deadly force. The firm’s Massachusetts self-defense page explains the elements of the defense itself.

The Two First-Aggressor Disputes

Commonwealth v. Chambers, 465 Mass. 520, 529 to 530 (2013), holds that the first aggressor may be either of two people: the person who initiated the confrontation, or the person who first escalated it by using or threatening deadly force. Commonwealth v. Deconinck, 480 Mass. 254, 263 (2018), restates the rule as two circumstances, and Commonwealth v. Souza, 492 Mass. 615 (2023), confirms that Adjutant evidence is admissible only when one or both of those issues are genuinely in dispute. Evidence may be relevant to one issue, the other, or both.

The distinction matters when the parties agree that one person began a nondeadly confrontation but dispute who first used or threatened deadly force. There is no Adjutant issue when the relevant identity is undisputed. In Commonwealth v. Andrade, 496 Mass. 144 (2025), exclusion was proper where the alleged victim was undisputedly the initial aggressor and the defendant unilaterally escalated the encounter by using deadly force.

Commonwealth v. Camacho, 472 Mass. 587 (2015), supplies two further limits. The evidence is inadmissible where the parties dispute only whether the defendant was legally entitled to use the level of force employed, rather than who began or escalated the altercation. Camacho, 472 Mass. at 594. And the evidence is admissible only where the alleged victim was involved in the altercation that led to the charge.

Souza states the outer limit on purpose. Adjutant evidence is not broadly admissible to show that the Commonwealth failed to disprove self-defense. It is admissible exclusively to help the jury decide who initiated the conflict or who first used or threatened deadly force.

The exception applies to self-defense. The Supreme Judicial Court has twice declined to extend it to a claim of defense of another, each time on the case before it. Commonwealth v. Camacho, 472 Mass. 587, 596 n.12 (2015); Commonwealth v. Rateree, 495 Mass. 610, 624 (2025). Counsel should assume the evidence will be excluded on a defense of another theory absent a compelling record.

A different subsection, Mass. G. Evid. § 404(a)(2)(C) (2026), governs evidence of violent conduct that the defendant knew about before the charged encounter and that the defense offers to show a reasonable concern for personal safety.

Qualifying Prior and Later Incidents

The proposed evidence must concern specific violent incidents that the alleged victim is reasonably alleged to have initiated, or qualifying violent acts by a third party acting in concert with or to assist the alleged victim. General assertions that a person was violent are not the same as proof of a particular incident. Participation in boxing, martial arts, or another athletic activity does not by itself qualify as first-aggressor evidence. Commonwealth v. Amaral, 78 Mass. App. Ct. 557 (2011).

The incident need not predate the charged event. Andrade confirms that a qualifying incident may have occurred before or after it. Andrade, 496 Mass. at 147 to 148. Under Souza, once the defense shows that the alleged victim initiated the violence in the earlier episode, the entire violent incident is potentially admissible, not only its first moment, so that the jury has an accurate account. The evidence must still comply with the other rules of evidence.

Known and Unknown Incidents Serve Different Purposes

The defendant need not have known about an incident when offering it under Adjutant to identify the first aggressor or the first person to use or threaten deadly force. Andrade confirms that admissibility under Adjutant does not depend on whether the defendant was aware of the violent act at the time of the alleged offense. An unknown incident may bear on the alleged victim’s propensity to initiate violence, subject to the rule’s limits.

Knowledge matters for a different use. If the defendant knew about a specific prior violent act before the charged encounter, Mass. G. Evid. § 404(a)(2)(C) (2026) permits the evidence to explain the defendant’s actual concern for personal safety and whether that concern was reasonable. When admitted only for this state-of-mind purpose, the evidence may not be used as propensity proof that the alleged victim acted in conformity with a violent character during the charged incident.

In Amaral, the Appeals Court noted in a footnote that a defendant’s prior knowledge of an alleged victim’s training as a boxer or martial artist might have supported this state-of-mind theory, even though the training itself was not first-aggressor evidence.

Rule 14.3 Notice and Deadlines

Massachusetts Rule of Criminal Procedure 14.3(c) provides the current procedure. Rule 14.3 took effect March 1, 2025, and consolidated former Rule 14(b)(1), (b)(3), and (b)(4) without substantive change, so older motions, memoranda, and secondary sources describe the same notice requirement as Rule 14(b)(4).

A defendant who intends to claim self-defense and offer the alleged victim’s specific violent acts as first-aggressor evidence must give written notice no later than 21 days after the pretrial hearing, unless the judge sets another time for good cause. The notice must briefly describe each incident, give its location and date to the extent practicable, and identify the witnesses the defense may call with the information required by the rule. The defense must file a copy with the clerk.

The prosecution ordinarily has 30 days after receiving the defense notice to serve written notice of the rebuttal evidence it may introduce, including a brief description and the required witness information. Both sides have a continuing duty to disclose additional responsive evidence. If a party fails to comply, the judge may exclude that party’s evidence on the issue of the identity of the first aggressor.

The rule governs notice only. Morales states that nothing in the rule itself authorizes the admission of any evidence; whether to admit the proffered incidents, and which ones, remains a discretionary determination for the judge.

The Commonwealth’s Rebuttal Evidence

The Commonwealth may respond with two forms of character evidence in addition to ordinary factual rebuttal and impeachment. It may offer evidence of the alleged victim’s peaceful propensities. Commonwealth v. Adjutant, 443 Mass. 649 (2005), citing Commonwealth v. Lapointe, 402 Mass. 321, 325 (1988). Under Commonwealth v. Morales, 464 Mass. 302, 310 to 311 (2013), it may also offer specific incidents of the defendant’s prior violent conduct.

The two sides of the rule are not symmetrical. Adjutant holds that a victim’s general reputation for violence is not admissible to prove who was the first aggressor, because reputation evidence is often “opinion in disguise”; the defense proves that point with specific incidents. The peaceful-propensities rebuttal is available to the prosecution once the defendant’s Adjutant evidence has been admitted.

Morales does not authorize the prosecutor to introduce the defendant’s criminal record generally. The rebuttal is limited to specific prior violent conduct, must satisfy the other rules of evidence, and is subject to its own balancing test, described below. Reciprocal notice gives the defense an opportunity to investigate and challenge the proposed rebuttal.

This distinction changes the strategic analysis. Counsel should examine the facts and admissibility of the alleged victim’s incidents, the prosecution’s potential response, and the likely jury instruction. The question is not simply which person has more convictions or which record appears worse.

The Two Balancing Tests

The defense proffer and the prosecution rebuttal are weighed under two different formulations, and the difference matters at the motion stage.

For the defendant’s evidence about the alleged victim, the judge must evaluate the circumstances and may admit the evidence only if its probative value outweighs its prejudicial effect. That is Adjutant’s own formulation for this category of evidence. Adjutant, 443 Mass. at 664.

The judge may also limit cumulative testimony or exclude evidence that would cause unfair prejudice, confusion, or delay. Establishing a relevant dispute does not make every proposed incident admissible. Rateree confirms that the judge retains discretion to exclude Adjutant evidence even where the factual predicate for admission is satisfied, and a reviewing court will uphold the ruling absent an abuse of discretion.

For the Commonwealth’s rebuttal with the defendant’s own prior violent acts, Morales states a distinct test. The evidence may be admitted only if it is more probative of its intended purpose than prejudicial to the defendant, and the judge must weigh that balance very carefully because the potential prejudice is to the person on trial. Morales, 464 Mass. 302, 310 to 311 (2013).

The Required Limiting Instruction

When evidence is admitted under the first-aggressor rule, the judge must give a limiting instruction identifying its permitted use.

The operative charge printed in the current model instructions confines the jury’s consideration to deciding who attacked whom first in the altercation. Massachusetts District Court Model Jury Instructions 9.261, 9.262, and 9.263 (rev. Feb. 2026).

Where the parties also dispute who first used or threatened deadly force, the judge must tailor the instruction to that issue, because Chambers and Souza extend the permitted use to that second question. The note to Mass. G. Evid. § 404(a)(2)(B) (2026) states the requirement directly: the instruction must identify the permissible use as first aggressor, first to use deadly force, or both.

Souza confirms the limit in the other direction: where the identity of the person who escalated to deadly force is not in dispute, the defendant is not entitled to an instruction on that branch.

When evidence of specific violent acts by either the alleged victim or the defendant is admitted, the judge must give the limiting instruction when the evidence is introduced and again in the final charge. Morales, 464 Mass. 302 (2013).

The instruction matters because prior-incident evidence can be highly prejudicial. The jury may not use it to draw a general character inference, infer the defendant’s guilt, or decide issues beyond the specific first-aggressor or deadly-force question identified by the judge.

Adjutant Evidence in Domestic Assault Cases

Self-defense and first-aggressor disputes can arise in prosecutions for assault and battery and for assault and battery on a family or household member under G. L. c. 265, §§ 13A and 13M. Even when the § 13M relationship element is charged, and self-defense is fairly raised, the Commonwealth must prove beyond a reasonable doubt that there was no self-defense. Commonwealth v. Harris, 464 Mass. 425 (2013). Body-camera video, 911 calls, photographs, medical evidence, messages, witness accounts, and the sequence of events may be important before prior-incident evidence is considered.

Separate from Adjutant, evidence of prior domestic incidents may sometimes be admitted under § 404(b) for a genuine nonpropensity purpose, such as relationship context, motive, intent, or absence of mistake or accident, subject to the more-exacting bad-act balancing rule. An appropriate limiting instruction should be requested and used when the governing circumstances require it.

A defense review should begin with the charged assault or battery theory and the evidence from the incident itself. Counsel can then determine whether the identity of the initial aggressor or the person who first used or threatened deadly force is genuinely disputed, locate reliable proof of specific incidents, satisfy Rule 14.3, and prepare for possible rebuttal. The firm’s domestic-violence defense page explains the broader criminal process.

Preparing the Evidence Before Trial

Potential first-aggressor evidence should be investigated early. Police reports, court records, recordings, photographs, and witnesses may help identify admissible proof of what occurred and who initiated the violence. Ordinary hearsay rules still apply. When the Commonwealth offers a testimonial statement, the Confrontation Clause may impose a separate restriction. A charge or docket label alone does not establish the underlying conduct.

Serpa Law Office represents people raising self-defense in assault, assault and battery, domestic assault, and dangerous-weapon cases throughout Massachusetts. Call 617.936.0201 or use the contact form to request a confidential consultation.