Adjutant Evidence and Rebuttal in Massachusetts Self-Defense Cases

Correction, August 16, 2026: An earlier version of this article misidentified SJC-12678 and attributed holdings to Commonwealth v. Ramos that the decision did not make. SJC-12678 is Commonwealth v. Jose Ramos, 490 Mass. 818 (2022), a postconviction DNA-testing decision under G.L. c. 278A. This article has been replaced after primary-source review.

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, 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. It also requires timely notice and 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 current Massachusetts Guide to Evidence § 404(a)(2)(B) permits the judge to admit specific violent incidents that the alleged victim is reasonably alleged to have initiated. It also covers qualifying violent acts by a third party acting in concert with or to assist the alleged victim.

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. Souza, 492 Mass. 615 (2023), identifies two relevant disputes: who started the confrontation and who escalated the confrontation by first using or threatening deadly force. 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. Conversely, 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.

The exception applies to self-defense. The Supreme Judicial Court declined to extend it to a claim of defense of another in Commonwealth v. Rateree, 495 Mass. 610 (2025). A different rule may govern evidence the defendant knew before the incident and offers to explain 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.

The incident need not predate the charged event. Andrade confirms that a qualifying incident may have occurred before or after it. Under Souza, the judge may admit the entire violent incident, not only its first moment, when that context is needed to give the jury an accurate account. The evidence must still comply with the other rules of evidence.

The judge must evaluate the circumstances and may admit the evidence only if its probative value outweighs its prejudicial effect. 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.

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. 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, the evidence may help 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.

Rule 14.3 Notice and Deadlines

Massachusetts Rule of Criminal Procedure 14.3(c) provides the current procedure. 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 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 community reputation for peacefulness. Under Commonwealth v. Morales, 464 Mass. 302, 310-311 (2013), it may also offer specific incidents of the defendant’s prior violent conduct.

Morales does not authorize the prosecutor to introduce the defendant’s criminal record generally. The judge may admit the proposed rebuttal only if it concerns specific prior violent conduct, satisfies the other evidence rules, and is more probative of its intended purpose than prejudicial to the defendant. 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 Required Limiting Instruction

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

The current model Adjutant instruction limits the jury’s consideration to deciding who attacked first, who escalated the potential for violence through the use or threat of deadly force, or both, depending on what is disputed.

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.

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 under both G.L. c. 265, §§ 13A and 13M. Even when the § 13M relationship element is charged, the Commonwealth must disprove fairly raised self-defense beyond a reasonable doubt. 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.