Appeals Court Vacates Conviction Over Missing “Bad Acts” Instruction

The Massachusetts Appeals Court recently issued a decision in Commonwealth v. Elon Silva Duarte (24-P-292, March 3, 2026) vacating a conviction for indecent assault and battery due to a trial judge’s failure to give a requested limiting instruction on bad acts evidence.

At first glance, the decision appears significant for trial practice—particularly in cases involving multiple allegations or joined charges.

But there is an important threshold point that must be understood:

This is a Rule 23.0 decision.

That means:

• It is a summary decision

• It reflects only the views of the panel

• It is not binding precedent

• It may be cited only for persuasive value

The Appeals Court itself expressly notes these limitations.

Still, even with that limitation, the case provides useful guidance—especially for defense attorneys handling cases involving multiple allegations and potential propensity evidence.

What Is a Rule 23.0 Decision?

Before diving into the substance, it’s critical to understand what this type of decision is—and what it is not.

Under Massachusetts Appeals Court Rule 23.0:

• Summary decisions are issued in cases that do not present new or complex legal questions

• They are not circulated to the full Appeals Court

• They often provide abbreviated reasoning

• They are intended primarily for the parties

As a result:

They may be cited for persuasive value, but they are not binding precedent.

That distinction matters.

This case can be helpful in argument—but it does not carry the same weight as a published Appeals Court or SJC decision.

The Core Issue: Failure to Give a Limiting Instruction

Despite its limited precedential value, Duarte addresses a recurring and important trial issue:

What happens when evidence that was initially admissible becomes “bad acts” evidence—and the jury is not properly instructed on how to use it?

The Appeals Court’s answer: that can be reversible error.

The Facts: Two Allegations, One Trial

The defendant was charged with two counts of indecent assault and battery involving two different alleged victims:

• M.W.

• R.H.

Both incidents were alleged to have occurred in the same store on the same day.

The cases were joined and tried together.

Before trial, the defense argued that:

• Each allegation would function as improper “bad acts” evidence with respect to the other

The trial judge denied the motion, allowing the cases to proceed together.

The Critical Turning Point: One Charge Falls Away

During trial, a key development occurred.

One of the alleged victims—R.H.—could not identify the defendant as the person who touched her.

As a result:

• The judge allowed a motion for a required finding of not guilty on that count

At that point, the case changed fundamentally.

What had previously been direct evidence of a charged offense became something else entirely.

The Transformation: From Substantive Evidence to Bad Acts Evidence

Once the R.H. charge was dismissed, her testimony no longer served as proof of a charged offense.

Instead, it became:

• Evidence of an uncharged act

• Potentially admissible only for limited purposes

In other words, it became bad acts evidence.

And that change triggered a critical requirement.

The Law of Bad Acts Evidence

Massachusetts law is clear:

Evidence of other bad acts cannot be used to show that a defendant has a criminal propensity.

That is, the jury cannot reason:

“He did it before, so he probably did it again.”

However, such evidence may be used for limited purposes, such as:

• Identity

• Intent

• Pattern of conduct

• Absence of mistake

Because of the risk of misuse, courts require:

A limiting instruction explaining how the jury may—and may not—use the evidence.

What Went Wrong at Trial

In Duarte, the judge did not give that instruction.

Instead, the judge told the jury only that:

• They did not need to consider the dismissed charge involving R.H.

That was not enough.

It failed to answer two critical questions:

• Could the jury still consider R.H.’s testimony?

• If so, for what purpose?

Without guidance, the jury was left to figure it out on their own.

The Defense Preserved the Issue

Importantly, the defense:

• Specifically requested a bad acts instruction at sidebar

• Objected when the judge declined to give it

This preserved the issue for appellate review.

That detail is crucial.

Without a request, the standard of review—and the likelihood of reversal—would have been very different.

The Appeals Court’s Decision

The Appeals Court concluded that the failure to give a limiting instruction was prejudicial error.

The standard applied was whether:

There was a reasonable possibility that the error contributed to the verdict.

The Court found that standard was met.

Why?

Because:

• Bad acts evidence carries a high risk of prejudice

• The jury may have used the testimony improperly

• The Commonwealth’s case was not overwhelming

As a result, the conviction was vacated and the verdict set aside.

Why This Matters (Even Though It’s Not Binding Precedent)

Even though Duarte is not binding, it reinforces several important principles already recognized in Massachusetts law.

1. Bad Acts Evidence Is Dangerous

Courts repeatedly emphasize that bad acts evidence carries a “high risk of prejudice.”

That risk does not disappear simply because the evidence was initially admissible.

Once its role changes, the court must adjust accordingly.

2. Limiting Instructions Are Critical

This case underscores the importance of jury instructions in managing that risk.

A vague or incomplete instruction is not enough.

The jury must be told:

• Whether they can consider the evidence

• The specific purposes for which they can consider it

• That they cannot use it to infer propensity

3. Timing Matters

The need for a limiting instruction may arise mid-trial.

In Duarte, the issue did not fully crystallize until:

• The R.H. charge was dismissed

Trial judges must adapt to those developments.

4. Preservation Is Everything

The defense’s request for a limiting instruction made all the difference.

Had the issue not been preserved:

• The appellate court would have applied a more deferential standard

• The result might have been different

Additional Issues Flagged by the Court

Although the Appeals Court vacated the conviction based on the bad acts instruction issue, it flagged other concerns that may arise on retrial:

• The admissibility of translated statements during a police interview

• Problems with the accident instruction given to the jury

• Potential issues with identification evidence

These comments, while not dispositive, provide a roadmap for both sides on retrial.

Defense Takeaways

For defense attorneys, Duarte—even as a Rule 23.0 decision—offers several practical lessons.

1. Always Revisit Evidentiary Issues Mid-Trial

What is admissible at the start of trial may become problematic later.

When charges are dismissed or evidence shifts in purpose, revisit:

• Motions in limine

• Requests for limiting instructions

2. Request Specific Instructions

Do not rely on the judge to act sua sponte.

Make a clear, specific request for:

• A bad acts instruction

• Tailored language where appropriate

3. Create a Clean Record

Preservation is key.

Make sure:

• The request is on the record

• The objection is clear

• The grounds are articulated

4. Emphasize Weakness of the Commonwealth’s Case

On appeal, prejudice often turns on the strength of the evidence.

If the case is not overwhelming, instructional errors become more significant.

Prosecutorial Takeaways

For prosecutors, the case is a reminder to:

• Request limiting instructions when appropriate

• Anticipate changes in evidentiary posture

• Avoid reliance on evidence that risks being used as propensity

Key Takeaways

• Commonwealth v. Duarte is a Rule 23.0 decision and not binding precedent

• It may be cited only for persuasive value

• The case reinforces the importance of limiting instructions for bad acts evidence

• Failure to give a requested instruction can result in reversal

• Trial dynamics can change the role of evidence, requiring updated instructions

Frequently Asked Questions (FAQ)

1. What is a Rule 23.0 decision?

It is a summary decision issued by the Appeals Court that is not binding precedent. It can be cited only for persuasive value.

2. What is “bad acts” evidence?

Evidence of other misconduct that is not charged in the case. It cannot be used to show that a defendant has a criminal propensity.

3. When is a limiting instruction required?

When bad acts evidence is admitted, especially upon request, the judge should instruct the jury on the limited purposes for which it can be used.

4. Why was the conviction vacated in this case?

Because the judge failed to give a requested limiting instruction after evidence became bad acts evidence, creating a risk that the jury used it improperly.

5. Does this case change Massachusetts law?

No. As a Rule 23.0 decision, it does not create binding precedent, but it reflects how the Appeals Court applies existing principles.

Final Thoughts

Commonwealth v. Duarte is not a landmark decision—but it is a useful one.

It highlights a recurring issue in criminal trials: how evidence evolves, and how courts must guide juries in using it properly.

Most importantly, it serves as a reminder that:

Even small instructional errors can have major consequences.

And while this decision is not binding, the principle it reflects is well established:

When evidence carries a risk of unfair prejudice, the jury must be told how to handle it.

Failing to do so can—and sometimes will—require a new trial.