Under California law, character evidence generally cannot be used to prove that a person acted a particular way on a particular occasion, but the Evidence Code contains a long list of exceptions that regularly bring it in anyway. Section 1101(a) sets the ban. Sections 1102, 1103, 1108, and 1109 open specific doors in criminal cases. Section 1101(b) lets prior acts in for non-propensity purposes like motive or intent. Credibility rules, habit evidence, and a handful of civil provisions round out the picture. Whether the jury actually hears the evidence usually turns on which exception applies and how the trial judge rules under the Section 352 balancing test.
The Default Ban Under Section 1101(a)
Evidence Code Section 1101(a) makes character evidence inadmissible when the purpose is to prove conduct on a specific occasion.1California Legislative Information. California Code Evidence Code 1101 The ban covers all three forms character evidence typically takes: opinion testimony, reputation testimony, and specific past conduct. Telling a jury that a defendant has a violent temper so they probably committed the assault is exactly the reasoning the statute forbids. The concern is unfair prejudice — that jurors will decide the case based on who someone is rather than what they did.
The statute itself names four exceptions on its face: Sections 1102, 1103, 1108, and 1109. It also carves out witness credibility entirely under Section 1101(c) and preserves a wide channel under Section 1101(b) for prior-act evidence offered for something other than propensity. The default matters, but the exceptions account for most of what actually happens at trial.
How Character Gets Proved When It’s Allowed
When an exception applies, Section 1100 governs the form the evidence can take. California generally allows opinion, reputation, and specific-instance evidence, unless a more specific statute narrows the options.2California Legislative Information. California Code Evidence Code 1100 That caveat matters. Section 1102 limits proof of a criminal defendant’s own character to opinion and reputation, not specific instances. Section 1103 allows all three when the target is a crime victim. Always check the specific section rather than assuming the general rule controls.
Character Evidence in Criminal Cases
When the Defendant Opens the Door
Section 1102 lets a criminal defendant introduce opinion or reputation evidence of a relevant character trait to argue they acted consistently with it. A defendant charged with fraud might call witnesses to testify about a reputation for honesty. The prosecution cannot go first with bad-character evidence. Only after the defendant opens the door can the prosecution offer opinion or reputation evidence in rebuttal.3California Legislative Information. California Code EVID 1102
This is sometimes called the mercy rule. It carries obvious risk. A defendant who calls character witnesses invites the prosecution to put on its own witnesses describing the defendant’s reputation as dishonest or violent. Defense attorneys weigh that trade carefully.
The Victim’s Character
Section 1103(a) allows a criminal defendant to introduce evidence of the victim’s character when it supports the defense theory.4California Legislative Information. California Code Evidence Code 1103 In a self-defense case, the defendant might present evidence that the victim had a reputation for violence to support the claim that the victim was the aggressor. Unlike Section 1102, all three forms of proof are available — opinion, reputation, and specific instances of the victim’s conduct.
The prosecution then has two responses under Section 1103(b). It can rebut with evidence of the victim’s peaceful character, and it can introduce evidence of the defendant’s own character for violence to show the defendant was the likely aggressor. Attacking the victim’s character exposes the defendant’s.
The Rape Shield
Section 1103(c) sharply limits the victim’s-character rules in sexual assault prosecutions. The defendant generally cannot introduce opinion evidence, reputation evidence, or specific instances of the victim’s sexual conduct to prove consent. The statute also bars evidence about how the victim was dressed at the time of the offense when offered on the issue of consent.
The shield has limits. Evidence of the victim’s sexual conduct with the defendant is not barred. And if the prosecution introduces evidence about the victim’s sexual conduct, the defendant may cross-examine and offer rebuttal tied specifically to what the prosecution raised.
Propensity Exceptions: Sexual Offenses and Domestic Violence
Prior Sexual Offenses (Section 1108)
Section 1108 is one of the more aggressive departures from the propensity ban in any jurisdiction. When a defendant is charged with a sexual offense, the prosecution can introduce evidence that the defendant committed other sexual offenses to show a propensity to commit the charged crime.5California Legislative Information. California Code Evidence Code 1108 This is pure propensity reasoning. The California Supreme Court upheld the statute in People v. Falsetta, reasoning that Section 352 gives the trial court enough discretion to exclude unfairly prejudicial evidence to satisfy due process.6Justia. People v. Falsetta (1999)
The definition of “sexual offense” is broad, covering conduct from sexual battery and rape to possession of child pornography. The prosecution must disclose its Section 1108 evidence before trial. Even with that notice, this evidence is often the most heavily contested issue in a sexual offense case.
Domestic Violence, Elder Abuse, and Child Abuse (Section 1109)
Section 1109 mirrors Section 1108 for domestic violence, elder abuse, and child abuse prosecutions. The prosecution can introduce evidence of the defendant’s other acts of the same category of abuse, subject to Section 352.7California Legislative Information. California Code Evidence Code 1109
One difference matters: Section 1109 includes a ten-year limit that Section 1108 does not. Acts more than ten years before the charged offense are inadmissible unless the court finds admission is in the interest of justice. For child abuse charges, the court must specifically consider corroboration and remoteness. Pretrial disclosure is required.
Prior Acts for Non-Propensity Purposes
Section 1101(b) is the most frequently litigated pathway for prior-act evidence. It allows evidence that a person committed a prior crime or other act when the evidence is relevant to prove something other than propensity. The statute lists examples: motive, opportunity, intent, preparation, plan, knowledge, identity, and absence of mistake or accident.
Most character evidence battles are fought here. Evidence that a defendant filed prior suspicious insurance claims is not admissible to show they are the kind of person who commits fraud. The same evidence might be admissible to show a common plan or scheme, or knowledge of how to stage a loss. The underlying facts are identical; only the inferential pathway changes.
Judges scrutinize Section 1101(b) evidence carefully. The prosecution must clearly articulate the non-propensity purpose, and the court applies Section 352. Prior acts that look like propensity evidence dressed up as “plan” or “intent” do not survive a well-argued motion to exclude.
Character Evidence in Civil Cases
Civil cases impose tighter limits. Section 1104 bars evidence of a person’s character trait for care or skill when offered to prove conduct on a particular occasion, except through Sections 1102 and 1103 — which apply only in criminal cases.8California Legislative Information. California Code Evidence Code 1104 In a car accident case, you cannot introduce evidence that the other driver is generally careless to prove they drove negligently on the day of the crash.
The main civil exception arises when character itself is an essential element of a claim or defense. Defamation is the classic example: if someone sues over a statement calling them dishonest, the plaintiff’s actual character for honesty is directly relevant to whether the statement was true. Negligent entrustment follows the same pattern. When character is the fact the jury must decide, not a stepping stone to an inference, the general ban does not apply.
California also has a civil rape shield under Section 1106. In sexual harassment, sexual assault, and sexual battery cases, defendants cannot introduce the plaintiff’s sexual conduct to prove consent or absence of injury. Conduct with the defendant remains admissible, and the plaintiff can open the door by introducing their own sexual conduct evidence, at which point the defendant may cross-examine and offer rebuttal. The structure mirrors the criminal rape shield.
Attacking a Witness’s Credibility
Character evidence used to attack or support a witness’s credibility runs on its own track. Section 1101(c) preserves this category, so the general ban does not apply to credibility disputes. Section 780 lets the court and jury consider anything with a tendency to prove or disprove a witness’s truthfulness, including character for honesty, prior inconsistent statements, bias, and capacity to perceive or remember.9California Legislative Information. California Code Evidence Code 780
Two restrictions narrow that broad mandate. Section 786 limits character-based credibility attacks to traits of honesty or veracity. A party cannot impeach a witness by showing they are generally reckless or irresponsible.10California Legislative Information. California Code Evidence Code 786 Section 787 bars evidence of specific past conduct offered solely to prove a character trait relevant to credibility, with one exception — prior felony convictions.11California Legislative Information. California Code Evidence Code 787
Section 788 permits impeachment with a felony conviction, through cross-examination or the record of the conviction. Several exceptions protect witnesses whose convictions have been resolved: a pardon based on innocence, a certificate of rehabilitation and pardon, or dismissal under Penal Code Section 1203.4. The 1203.4 exception does not apply when the witness is a defendant being prosecuted for a new offense.12California Legislative Information. California Code Evidence Code EVID 788
Habit Is Not Character
Confusing habit with character is a common mistake. Section 1105 makes habit and custom evidence admissible to prove conduct on a specific occasion. No exception needed, no door to open, no balancing test beyond Section 352.13California Legislative Information. California Code Evidence Code 1105 Habit gets better treatment because it is more predictive. A general disposition toward carefulness says little about what someone did on a given afternoon. Evidence that someone always locks a specific door at 10 p.m. is highly probative of whether they locked it that night.
The line comes down to specificity and repetition. Character is a broad description of disposition. Habit is a specific, semi-automatic response to a particular situation, repeated across many instances. Without a consistent, near-automatic response to a recurring situation, what you have is character evidence dressed up as habit, and Section 1101(a) applies.
The Section 352 Balancing Test
Nearly every exception in this area is subject to Section 352, which lets the trial court exclude evidence when its probative value is substantially outweighed by the probability of undue prejudice, jury confusion, or undue consumption of time.14California Legislative Information. California Code Evidence Code 352 For Sections 1108 and 1109, this discretion is what the California Supreme Court pointed to when rejecting constitutional challenges to propensity evidence in sexual offense cases.
In practice, most character evidence fights are won or lost on motions in limine filed before trial. The court weighs how similar the prior act is to the charged conduct, how remote in time it is, whether it is likely to inflame the jury, and how much trial time will be spent litigating a collateral issue. Evidence that technically fits an exception can still be excluded if the jury is more likely to punish the defendant for being a bad person than to use the evidence for its permitted purpose. Trial courts have wide discretion, and appellate courts rarely disturb a Section 352 ruling.