Request for Notice of Extraneous Offenses or Convictions

A request for notice of extraneous offenses is a defense tool that asks the court to compel the prosecution to disclose, before trial, any evidence of other crimes, wrongs, or acts it intends to use against the defendant under Federal Rule of Evidence 404(b). Since a 2020 amendment to the federal rule, that disclosure is now automatic: the prosecutor must provide written pretrial notice whether or not the defense asks for it.¹ A formal defense request still has a purpose, though — it can push the court to set a firm deadline, demand greater detail, and lock the issue down well before trial.

What Counts as an Extraneous Offense

Rule 404(b) covers any “other crime, wrong, or act” the prosecution wants to use against the defendant beyond the charged offense. That includes prior convictions, but it also reaches uncharged conduct — behavior that was never arrested or prosecuted. If the government wants to tell the jury about some prior bad act of the defendant’s, the notice obligation applies as long as the evidence is extrinsic to the charged crime.¹

The rule does not reach everything. Conduct that is “intrinsic” to the charged offense — part of the same transaction, or evidence that directly proves the crime itself — falls outside 404(b) and does not require notice.¹ The intrinsic/extrinsic line is one of the most frequently contested points in 404(b) litigation, because prosecutors sometimes characterize other-act evidence as intrinsic precisely to avoid the notice-and-admissibility framework.

The substantive rule itself is a prohibition. Rule 404(b)(1) bars other-act evidence offered to show the defendant acted “in accordance with” a character trait — the forbidden “he did it before, so he probably did it again” inference. Rule 404(b)(2) then opens a door for the same evidence when it serves a different purpose: motive, opportunity, intent, preparation, plan, knowledge, identity, or absence of mistake.¹ The notice requirement exists so the defense can test which side of that line the proffered evidence actually falls on.

What the Prosecution’s Notice Must Contain

The federal rule imposes three obligations on the prosecutor. The notice must identify the evidence the government intends to offer, state the permitted non-propensity purpose it is being offered for, and explain the reasoning that connects the evidence to that purpose.¹

The notice does not have to read like an indictment. The drafters rejected a particularity standard, requiring only that the prosecution describe the general nature of the extrinsic-act evidence in enough detail for the defense to prepare a response. In practice, that means identifying the acts with reasonable specificity — enough for defense counsel to investigate the allegations, interview witnesses, and build arguments against admissibility.

The notice must be in writing and delivered before trial. It applies no matter how the prosecution plans to use the evidence, whether in its case-in-chief, for impeachment, or on rebuttal.¹

When the Notice Has To Arrive

The federal rule requires “reasonable notice” but does not set a specific day count. What qualifies depends on the complexity of the case, the volume of extrinsic-act evidence, and the pretrial schedule. Many federal judges address 404(b) disclosure deadlines at pretrial conferences, and local rules sometimes impose their own timelines. State courts with similar provisions often spell out exact windows, commonly in the range of 10 to 30 days before trial.

There is one narrow exception to pretrial notice. If the court finds good cause, the prosecution may provide notice in any form during trial itself.¹ Courts read this exception narrowly. It applies to situations the prosecution could not reasonably have anticipated — for example, when the defendant’s own testimony opens a door nobody foresaw. Judges weigh whether the lack of pretrial notice was justified and whether late disclosure would unfairly prejudice the defense.

Does the Defense Still File a Request?

The old federal rule required the defense to ask before the prosecution had to disclose. That system produced boilerplate demands as a precaution, and defendants whose attorneys forgot to ask could be ambushed at trial. The 2020 amendment removed the request trigger entirely and put the obligation squarely on the prosecutor.¹

Even so, defense attorneys often still file a motion or written request. Doing so does three useful things. It asks the court to set a firm deadline on the record, well in advance of pretrial motions. It can demand more detail where the government’s initial disclosure is thin. And it preserves the issue so that any late or deficient notice is already framed as a litigated question. State practice varies, and some jurisdictions that have adopted automatic-notice provisions still contemplate a formal defense request as part of the pretrial process.

What Happens If the Prosecution Doesn’t Give Notice

Notice is a condition precedent to admissibility. If the court finds the prosecution did not meet its notice obligation, the extrinsic-act evidence is inadmissible.¹ The defense enforces this by filing a motion to exclude, arguing that late or missing notice denied a fair opportunity to respond.

Exclusion is not the only option a judge has. A court may grant a continuance to give the defense more time to prepare, which delays trial but lets the evidence in. In cases where late disclosure was particularly harmful or looked deliberate, courts can impose additional sanctions. Dismissal of charges is reserved for situations in which the prosecution’s failure so thoroughly undermines a fair trial that no lesser remedy can cure the harm.

Preserving the Objection for Appeal

If the defense believes the notice was insufficient or the evidence should not have come in, the objection has to be on the record at trial. A written objection or motion in limine filed before trial is the most reliable method. The rule itself contemplates that a court may require the prosecution to present 404(b) evidence for a pretrial ruling, giving the defense a chance to challenge it before the jury hears anything.¹

Vague objections rarely survive appellate review. The objection should identify the specific evidence, state why the notice was deficient (or why the evidence fails the 404(b) purpose test), and request a specific remedy. Appellate courts look for whether the defense raised the issue clearly enough for the trial judge to rule on it, and a well-framed written motion is the surest way to meet that standard.

1
Cornell Law School / Legal Information Institute. Federal Rules of Evidence Rule 404 – Character Evidence; Other Crimes, Wrongs, or Acts