CROSSOVER: Opening the Door in Family Cases: Defensive Theories Can Trigger Rule 404(b) Rebuttal Evidence

Richardson v. State, 04-25-00437-CR, October 21, 2026.

On appeal from 226th Judicial District Court, Bexar County, Texas

Synopsis

Texas Rule of Evidence 404(b) permits evidence of an extraneous act when it explains how a witness identified a party and directly rebuts a defensive theory raised during opening statement, rather than merely proving conduct in conformity with character. The evidence also survived Rule 403 because its probative value and the State’s need to answer the permission-to-enter theory were not substantially outweighed by unfair prejudice.

Relevance to Family Law

Although Richardson is a criminal case, its evidentiary analysis has direct application in Texas divorce, custody, and property litigation because Rules 403 and 404 govern civil proceedings as well. A family-law advocate may open the door during opening statement by advancing a factual theory—such as consent to access property, lack of knowledge of an account, absence of a relationship, or inability of a witness to identify a person—that makes otherwise excludable evidence of another act relevant for a non-character purpose. Once that occurs, the opponent may offer carefully limited rebuttal evidence to explain identity, knowledge, access, intent, absence of mistake, or another fact placed in dispute, subject to Rule 403 and an appropriate limiting instruction.

Family Law Crossover

The procedural mechanism is rebuttal through non-character evidence under Rule 404(b). Evidence of a crime, wrong, or other act is not admissible merely to show that a person has a particular character and acted consistently with it, but it may be admitted when relevant to another issue. Under Richardson, a theory affirmatively presented during opening statement may place such an issue in dispute before testimony begins and thereby create a permissible rebuttal purpose.

In a divorce, for example, counsel might argue in opening that one spouse could not have known about an undisclosed account because that spouse had no access to the other spouse’s financial information. That theory may increase the relevance of prior transactions, account alerts, card usage, or communications showing how the spouse learned of the account. In a custody case, a claim that a witness could not identify a caregiver, residence, vehicle, or location may permit limited evidence explaining the witness’s basis of knowledge—even if that explanation includes another act that otherwise would have been excluded.

The rule does not make rebuttal evidence automatically admissible. The proponent must articulate a genuine non-character purpose and connect the evidence to a disputed proposition. The trial court must still consider Rule 403, including the evidence’s probative force, the proponent’s need, the time required to present it, and the danger that the factfinder will use it for an improper or irrational purpose.

Case Summary

Fact Summary

Kayla Mountain testified that Richardson was a stranger whom she had seen around her apartment complex. During the same general period, she discovered unauthorized charges on several debit and credit cards, many of which had been made at a nearby vape shop. Mountain contacted the shop, and a conversation with an employee indicated that they were discussing the same person, although Mountain still did not know his name.

Believing someone had been entering her apartment, Mountain installed a security camera before leaving town. The camera later recorded Richardson inside the apartment. When Mountain returned, she discovered that property, including her television, was missing. She sent the surveillance footage to the vape-shop employee, who identified the person shown as Justin Richardson. Mountain then supplied Richardson’s name to law enforcement.

During opening statement, defense counsel asserted that Richardson had lived with Mountain for approximately two weeks, previously possessed a key, and returned to retrieve his belongings. Counsel relied specifically on Mountain’s ability to provide Richardson’s name and date of birth during a later 911 call, arguing that it was “impossible” for her to know that information if Richardson truly had been a stranger.

The State sought to introduce evidence concerning the unauthorized card use. It argued that the evidence explained how Mountain learned Richardson’s identity and rebutted the defense’s theory that her knowledge of his identifying information demonstrated a prior relationship and permission to enter the apartment. The trial court overruled Richardson’s Rules 404(b) and 403 objections but directed the State to “keep a light touch on it.”

Issues Decided

Whether Rule 404(b) permitted evidence of unauthorized credit-card use when the evidence was offered to explain how the complainant learned Richardson’s identity and to rebut the permission-to-enter theory raised during opening statement.
Whether Rule 403 required exclusion because the evidence’s probative value was substantially outweighed by unfair prejudice or the needless presentation of cumulative evidence.

Rules Applied

Texas Rule of Evidence 404(b) prohibits evidence of a crime, wrong, or other act when offered solely to prove character and action in conformity with that character. The rule permits such evidence, however, when it has relevance apart from character conformity, including relevance to identity or the rebuttal of a defensive theory. Dabney v. State, 492 S.W.3d 309, 317–18 (Tex. Crim. App. 2016); De La Paz v. State, 279 S.W.3d 336, 342–45 (Tex. Crim. App. 2009).

A defensive theory raised during opening statement can place an issue in dispute and permit responsive extraneous-act evidence. Bass v. State, 270 S.W.3d 557, 563 (Tex. Crim. App. 2008). The evidence must nevertheless be relevant for a legitimate purpose; “opening the door” does not eliminate the ordinary requirements governing relevance and admissibility.

The court distinguished the conventional use of extraneous acts to prove identity through a distinctive modus operandi. When identity is inferred by comparing the charged and extraneous acts, the acts must be sufficiently similar to identify them as the defendant’s handiwork. Page v. State, 213 S.W.3d 332, 336 (Tex. Crim. App. 2006). Here, however, the State used the card evidence to explain the witness’s process of learning Richardson’s name—not to prove that the same person committed two similar offenses.

Under Rule 403, relevant evidence may be excluded when its probative value is substantially outweighed by unfair prejudice, confusion, delay, or needless cumulative presentation. The pertinent considerations include:

The evidence’s probative force;
Its potential to affect the jury in an irrational but indelible manner;
The amount of time required to develop the evidence; and
The proponent’s need for the evidence.

See Inthalangsy v. State, 634 S.W.3d 749, 758 (Tex. Crim. App. 2021); Gigliobianco v. State, 210 S.W.3d 637, 641–42 (Tex. Crim. App. 2006).

The appellate court reviewed the evidentiary ruling for abuse of discretion and was required to affirm if the ruling fell within the zone of reasonable disagreement. Perkins v. State, 664 S.W.3d 209, 217 (Tex. Crim. App. 2022); De La Paz, 279 S.W.3d at 343–44.

Application

The court first rejected the contention that the card evidence was offered merely to identify Richardson as the person shown in the apartment. The State was not comparing the unauthorized card use with the burglary to establish a distinctive pattern. Instead, the evidence explained how Mountain progressed from recognizing Richardson as a person she had seen around the complex to learning his name from the vape-shop employee.

That distinction became material because of the defense’s opening statement. The defense relied on Mountain’s knowledge of Richardson’s name and date of birth as circumstantial proof that he had lived with her and possessed permission to enter the apartment. The card investigation supplied a competing, non-character explanation for that knowledge. It therefore directly rebutted a factual premise supporting the defensive theory.

The court then evaluated Rule 403. Although the evidence carried some potential for unfair prejudice by suggesting additional offenses against Mountain, it had substantial probative force because the State’s other identification evidence did not explain how Mountain learned Richardson’s identifying information. Surveillance footage could establish who entered the apartment, but it did not answer the defense’s argument that Mountain’s detailed knowledge demonstrated a prior relationship.

The State presented the evidence briefly and focused on Mountain’s investigation and acquisition of Richardson’s identity. The presentation did not become a separate trial over the unauthorized charges, and the card evidence was not substantially more inflammatory than the charged burglary. The trial court also gave a limiting instruction restricting the jury’s consideration of the evidence to permissible purposes. These controls supported the conclusion that the risk of unfair prejudice did not substantially outweigh the evidence’s probative value.

Holding

The Fourth Court of Appeals held that admission of the credit-card evidence did not violate Rule 404(b). The evidence was relevant to explain how Mountain learned Richardson’s identity and to rebut the defensive contention that her knowledge of his identifying information proved a prior relationship and permission to enter the apartment.

The court also held that Rule 403 did not require exclusion. The evidence had substantial probative force, addressed a point not adequately explained by the State’s other evidence, and was presented without undue consumption of time. Its potential for unfair prejudice did not substantially outweigh its probative value.

The court therefore overruled Richardson’s sole issue and affirmed the judgment.

Practical Application

Family-law litigators should treat opening statement as an evidentiary event, not merely advocacy. A factual assertion made in opening may alter the relevance calculus and provide an opponent with a legitimate basis to offer rebuttal evidence that previously appeared vulnerable under Rule 404(b).

Common applications include:

Consent to access property: In a divorce involving entry into a residence, office, storage facility, or digital account, a party may claim continuing permission based on a prior relationship or possession of a key or password. That theory may make other acts relevant to explain how access was obtained, limited, or revoked.
Tracing and undisclosed assets: A party may contend that the opposing spouse could not have known about an account, transaction, or business interest. Evidence of other transactions, card usage, financial alerts, or communications may become admissible to explain the source of that knowledge rather than to portray the party as financially irresponsible.
Waste and reimbursement claims: Evidence of separate transactions may be admissible when it explains the identity of the person controlling an account, rebuts an asserted mistake, or demonstrates the mechanism by which a disputed transaction was discovered. Counsel should tie each act to a disputed proposition rather than rely on a generalized pattern of misconduct.
Custody and conservatorship disputes: If a party challenges how a witness identified a caregiver, residence, vehicle, or location, evidence explaining that identification may become relevant even if it includes another act. The proponent should connect the evidence to knowledge, identity, access, or absence of mistake—not character.
Protective-order proceedings: A theory concerning mistaken identity, lack of access, or the witness’s inability to know particular information may permit focused rebuttal evidence. The trial court must still evaluate the evidence under Rules 401, 403, and 404.
Electronic and digital evidence: Claims that a party lacked knowledge of a device, account, location, or login may increase the relevance of prior notifications, access records, transactions, or communications. Authentication and hearsay objections remain separate from the Rule 404(b) analysis.

The principal strategic lesson is precision. The proponent should identify the exact factual proposition being rebutted, explain the non-character chain of relevance, and offer no more evidence than necessary. The opponent should avoid categorical objections and instead challenge the logical connection, the proponent’s actual need, the availability of less prejudicial proof, and the scope of the proposed presentation.

Checklists

Before Giving Opening Statement

Identify every factual assertion that may place identity, knowledge, access, consent, intent, or absence of mistake in dispute.
Determine whether each assertion may make an opponent’s extraneous-act evidence relevant in rebuttal.
Review pending motions in limine and confirm that they do not create a false assumption that opening statement cannot affect admissibility.
Avoid unnecessary categorical claims such as “impossible,” “never,” or “the only explanation” unless the evidentiary consequences have been evaluated.
Consider whether the theory can be presented more narrowly without sacrificing its strategic value.
Preserve flexibility by distinguishing anticipated evidence from established fact.

Offering Rebuttal Evidence Under Rule 404(b)

Identify the precise statement or theory that created the need for rebuttal.
State the non-character purpose on the record.
Explain the logical connection between the challenged evidence and the disputed issue.
Clarify whether the evidence proves identity directly or merely explains how a witness acquired identifying information.
Demonstrate why other available evidence does not address the same proposition.
Limit the number of witnesses, exhibits, and details to those needed for the rebuttal purpose.
Request an appropriate limiting instruction under Rule 105.
Avoid arguing that the other act proves the person acted consistently with a bad character.

Opposing the Evidence

Object under Rule 404(b) and require the proponent to identify a specific non-character purpose.
Argue that the evidence does not logically rebut the theory actually presented.
Distinguish between a genuinely disputed issue and a collateral matter.
Make a separate Rule 403 objection.
Address probative force, unfair prejudice, confusion, presentation time, and the proponent’s need.
Identify less prejudicial evidence that would establish the same fact.
Request that the court restrict the evidence’s scope if complete exclusion is denied.
Request a contemporaneous limiting instruction and an appropriate instruction in the court’s charge.
Obtain a clear ruling and renew objections when necessary to preserve error.

Conducting the Rule 403 Analysis

Assess how strongly the evidence proves the proposition for which it is offered.
Determine whether the evidence invites a character-conformity inference despite its stated purpose.
Compare the seriousness and inflammatory potential of the other act with the issues being tried.
Estimate the time needed to present and contest the evidence.
Evaluate whether the presentation will create a collateral mini-trial.
Consider the availability of stipulations, redactions, summaries, or narrower testimony.
Make the balancing analysis specific to the record rather than relying on a generalized claim of prejudice.
Remember that Rule 403 requires unfair prejudice to substantially outweigh probative value.

Preserving the Issue for Appeal

Obtain a ruling on both the Rule 404(b) and Rule 403 objections.
Ensure that the opening statement or other event allegedly opening the door appears in the reporter’s record.
Secure an offer of proof if rebuttal evidence is excluded.
Identify the exact exhibits and testimony covered by the ruling.
Request findings or a clear explanation of the permitted evidentiary purpose when practicable.
Object if the proponent exceeds the scope authorized by the trial court.
Preserve complaints concerning limiting instructions separately from the admissibility objection.

Citation

Richardson v. State, No. 04-25-00437-CR, slip op. at 1–7 (Tex. App.—San Antonio Oct. 21, 2026, no pet. h.) (mem. op., not designated for publication).

Full Opinion

Read the full opinion in Richardson v. State

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