Extraneous offenses in Texas are uncharged crimes, wrongs, or bad acts that prosecutors try to put in front of the jury even though the defendant is not on trial for them. Texas Rule of Evidence 404(b) generally bars this evidence when the only point is to show the defendant has a bad character, but there are real exceptions: non-character purposes like intent or identity, a special rule for sex offense cases under Article 38.37, and broad latitude during sentencing. Each path has its own threshold, notice requirement, and standard of proof.
What Counts as an Extraneous Offense
An extraneous offense is any crime, wrong, or bad act outside the conduct the defendant is currently charged with. It can be a prior conviction, an arrest that never led to charges, or behavior that was never reported to law enforcement at all. The defining feature is that the jury would not otherwise hear about it from the charged offense alone. Texas courts treat this evidence cautiously because the risk is obvious: jurors who learn a defendant has done bad things before may convict based on character rather than the proof of the charged crime.
When Prosecutors Can Use Them at the Guilt Phase
Texas Rule of Evidence 404(b) sets the baseline. The prosecution cannot introduce prior misconduct to argue that the defendant has a particular character and acted in line with it. A prior theft, for example, cannot come in to suggest “this person is a thief, so they probably did this one too.”
The rule does allow the evidence when it serves a purpose other than character conformity. The Texas Court of Criminal Appeals explained the framework in Montgomery v. State (1991), holding that extraneous offense evidence is admissible when it makes an element of the charged crime or a defensive theory more or less likely, independent of any character inference.1Justia Law. Montgomery v. State The permitted purposes include motive, opportunity, intent, preparation, plan, knowledge, identity, or absence of mistake. In Robbins v. State (2002), the court upheld admission of evidence of earlier injuries a child victim suffered in the defendant’s care, finding it relevant to intent and the absence of accident.2Justia Law. Robbins v. State
Courts scrutinize the stated purpose. Simply labeling evidence as “proof of intent” is not enough if intent is not actually in dispute. The more specific and genuinely contested the issue, the stronger the argument for admission.
The Rule 403 Balancing Test
Clearing 404(b) is only the first step. Texas Rule of Evidence 403 lets a judge exclude relevant evidence when its probative value is substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury. Most of the real courtroom fight happens here.
Under Montgomery, once evidence passes the 404(b) threshold there is a presumption in favor of admission, and the burden shifts to the defense to show that prejudice substantially outweighs the usefulness of the evidence.1Justia Law. Montgomery v. State Judges weigh how much the prosecution actually needs the evidence, whether other proof of the same point already exists, how strong the link is between the extraneous act and the charged offense, and how likely the evidence is to inflame the jury.
Timing matters. An extraneous act from decades ago with no connection to the current charge is far less likely to survive a Rule 403 challenge than a recent, similar act forming part of an ongoing pattern. When the prosecution already has other strong proof of the disputed point, the extraneous offense carries less weight on the probative side of the scale.
Same Transaction Contextual Evidence
Texas also recognizes a category of extraneous evidence that falls outside the usual 404(b) analysis. When uncharged conduct is so intertwined with the charged offense that the jury cannot understand the crime without hearing about it, courts may admit it as same transaction contextual evidence. A drug deal that leads to a shooting is the classic example: the jury may need to hear about the transaction to make sense of the shooting.
This evidence does not have to fit a 404(b) permitted purpose. The argument is that stripping the context away would leave jurors with a fragmented picture. Rule 404(b) acknowledges this category by excluding evidence arising in the same transaction from its notice requirements. The evidence still has to survive Rule 403 balancing, and the trial court can limit how much contextual detail the jury hears.
The Sex Offense Exception Under Article 38.37
Texas law carves out a major exception to the general ban on character-conformity evidence in sexual offense cases. Article 38.37 of the Code of Criminal Procedure has two sections, and both go further than Rule 404(b) allows anywhere else.
Section 1 applies to a broad list of sexual offenses and trafficking crimes. In those prosecutions, evidence of other crimes the defendant committed against the same victim is admissible to show the state of mind of the defendant and the victim and to illustrate their prior relationship.3State of Texas. Texas Code of Criminal Procedure Article 38-37 Section 1 The limit is that the prior acts must involve the same victim.
Section 2 is the true propensity exception. In prosecutions for specified child sexual abuse offenses, including continuous sexual abuse of a child, indecency with a child, sexual assault of a child, and several related crimes, the prosecution can introduce evidence that the defendant committed other similar offenses against any victim. The statute says the evidence may be used “for any bearing the evidence has on relevant matters, including the character of the defendant and acts performed in conformity with the character of the defendant.”4State of Texas. Texas Code of Criminal Procedure Art. 38.37 – Evidence of Extraneous Offenses or Acts The exact reasoning that Rule 404(b) forbids elsewhere is explicitly allowed here.
Section 2 does come with procedural guards. Before the evidence reaches the jury, the trial judge must hold a hearing outside the jury’s presence and determine that the evidence is sufficient to support a finding beyond a reasonable doubt that the defendant committed the separate offense. The prosecution must also give the defense at least 30 days’ notice before trial of its intent to introduce Section 1 or Section 2 evidence.4State of Texas. Texas Code of Criminal Procedure Art. 38.37 – Evidence of Extraneous Offenses or Acts
Extraneous Offenses at Sentencing
The rules loosen during the punishment phase. Under Article 37.07, Section 3(a)(1) of the Code of Criminal Procedure, the prosecution may introduce evidence of any extraneous crime or bad act relevant to sentencing, regardless of whether the defendant was ever charged with or convicted of that conduct.5State of Texas. Texas Code of Criminal Procedure Chapter 37 – Verdict That gives prosecutors wide room to describe the defendant’s broader conduct when the jury or judge decides the sentence.
The standard of proof, though, stays high. The statute requires that extraneous misconduct be “shown beyond a reasonable doubt by evidence to have been committed by the defendant.”5State of Texas. Texas Code of Criminal Procedure Chapter 37 – Verdict It is not preponderance. In Smith v. State (2007), the Court of Criminal Appeals reversed a sentence where the trial judge relied on extraneous misconduct from a pre-sentence report without a sufficient evidentiary basis, holding that due process forbids a court from considering extraneous misconduct when the record provides no rational basis to conclude the defendant was responsible for it.6Justia Law. Smith v. State
Notice the Prosecution Must Give
The prosecution cannot spring extraneous offense evidence on the defense at trial. The notice obligation works a little differently depending on the phase.
For evidence offered during the guilt phase under Rule 404(b), the prosecution must give reasonable advance notice of its intent to offer the evidence in its case-in-chief. This obligation kicks in only when the defense makes a timely request. In Buchanan v. State (1995), the Court of Criminal Appeals held that an “open file” policy does not satisfy the notice requirement; making evidence available in the file is not the same as affirmatively saying it will be used at trial.7Justia Law. Buchanan v. State
For punishment-phase evidence, Article 37.07, Section 3(g) requires notice in the same manner as Rule 404(b) when the defense makes a timely request. If the extraneous offense did not result in a final conviction or probated sentence, the notice must include the date, the county where the alleged offense occurred, and the name of the alleged victim.5State of Texas. Texas Code of Criminal Procedure Chapter 37 – Verdict
In Hernandez v. State (2005), the Court of Criminal Appeals confirmed that Rule 404(b) notice is a condition of admissibility, not a suggestion. Admitting extraneous offense evidence without proper notice is error, though the court applied a harm analysis and found no reversible error in that case because the defense suffered no actual prejudice.8Justia Law. Hernandez v. State The practical lesson: file notice requests early and in writing, because courts have sometimes excused thin notice when the defense had actual knowledge of the evidence.
Article 38.37 cases carry their own 30-day pretrial notice requirement.4State of Texas. Texas Code of Criminal Procedure Art. 38.37 – Evidence of Extraneous Offenses or Acts
Limiting Instructions
When extraneous offense evidence is admitted for a limited purpose, the defense can request a limiting instruction telling the jury to consider the evidence only for that purpose and not as proof that the defendant is the kind of person who commits crimes. Under Texas Rule of Evidence 105, the court must give the instruction on request. If the defense does not ask, there is no appeal issue later.
Article 38.37 has a stronger instruction requirement. When evidence comes in under either Section 1 or Section 2, the court must give a limiting instruction orally at the time the evidence is admitted and in writing at the end of the case. Either party can request it.3State of Texas. Texas Code of Criminal Procedure Article 38-37 Section 1 How much the instruction accomplishes in actual deliberation is debated, but failing to request one waives the issue, so there is no reason to skip it.
Standard of Proof
The quantum of proof the prosecution must show depends on when the evidence is offered. During the guilt phase, the trial judge decides whether a jury could reasonably find the extraneous act occurred before letting it in. In Harrell v. State (1994), the Court of Criminal Appeals examined this threshold and recognized that, given the potential for unfair prejudice, courts have traditionally imposed a higher bar for this type of evidence than for evidence generally.9Justia Law. Harrell v. State, 884 S.W.2d 154
During the punishment phase, Article 37.07 fixes the standard at beyond a reasonable doubt. The prosecution has to prove to that level that the defendant committed or was criminally responsible for the extraneous act before the judge or jury can weigh it in deciding the sentence.5State of Texas. Texas Code of Criminal Procedure Chapter 37 – Verdict If the evidence of an extraneous offense is thin or speculative, challenging its sufficiency can keep it out entirely.
Constitutional Backstops
Several constitutional provisions limit how far extraneous offense evidence can go. The Fourteenth Amendment’s due process clause and Article I, Section 19 of the Texas Constitution, which guarantees that no citizen shall be “deprived of life, liberty, property, privileges or immunities, or in any manner disfranchised, except by the due course of the law of the land,” both bar the state from using evidence so prejudicial that it convicts the defendant of being a bad person rather than of the charged crime.10Justia Law. Texas Constitution Article 1 Section 19 – Deprivation of Life, Liberty, Etc. Due Course of Law
The Sixth Amendment’s Confrontation Clause adds a separate layer. In Crawford v. Washington (2004), the U.S. Supreme Court held that testimonial statements from an absent witness cannot be admitted unless the witness is unavailable and the defendant had a prior chance to cross-examine them.11Justia Law. Crawford v. Washington, 541 U.S. 36 (2004) That matters when prosecutors try to prove extraneous offenses through police reports or written witness statements rather than live testimony. If those documents contain testimonial statements and the declarant does not take the stand, the evidence violates the Confrontation Clause no matter how relevant it is.
Preserving the Issue and Appealing
Appellate courts review a trial court’s decision to admit or exclude extraneous offense evidence for abuse of discretion. The appellate court will not substitute its own judgment; it reverses only when the trial court acted outside the zone of reasonable disagreement.
If the appellate court finds the evidence should not have come in, it then runs a harm analysis. The reviewing court looks at the whole record, the strength of the other evidence, whether the prosecution emphasized the improper evidence, and how likely it was to have swayed the jury.
Preservation is everything. If the defense does not object when the evidence is offered, the issue is waived. The same goes for limiting instructions: failing to request one gives up the right to argue on appeal that the jury misused the evidence. In any case where extraneous offenses are likely to come up, the defense should build the record from the start, with specific objections under both Rule 404(b) and Rule 403, a request for a hearing outside the jury’s presence where applicable, and a request for a limiting instruction at each turn.