Character evidence in California is presumptively inadmissible to prove that a person acted in a particular way on a specific occasion, but the Evidence Code carves out a long list of exceptions that let it in. The baseline rule lives in Section 1101(a); the exceptions span criminal defense character, victim character, propensity in sex offense and domestic violence cases, non-propensity uses of prior acts, witness credibility, and habit. Whether any specific piece of evidence makes it to the jury almost always depends on both the right exception and the trial court’s balancing under Section 352.
The Default Rule Against Character Evidence
Section 1101(a) bans character evidence, in any form, when it is offered to prove someone acted consistently with that character on a given occasion.1California Legislative Information. California Code Evidence Code 1101 Telling a jury the defendant has a “violent temper” so he probably committed the assault is the exact inference the rule forbids. The concern is prejudice: jurors deciding cases based on who someone is rather than what they did.
Section 1101(a) itself identifies the statutory exceptions by number (1102, 1103, 1108, and 1109), preserves witness credibility as its own category, and leaves open the broad channel in Section 1101(b) for prior acts used for non-propensity purposes. The ban is real, but a sizable share of trial evidence runs through one of these openings.
How Admissible Character Evidence Can Be Proved
When an exception applies, Section 1100 controls the form the proof can take. California allows opinion testimony, reputation testimony, and evidence of specific instances of conduct, unless a more specific statute narrows those options.2California Legislative Information. California Code Evidence Code 1100 That caveat matters. Section 1102 limits a defendant’s own-character evidence to opinion and reputation; Section 1103 lets victim-character evidence come in through all three forms. Always check the specific exception, not just the general rule.
A Criminal Defendant’s Own Character
Under Section 1102, a criminal defendant can offer opinion or reputation testimony about a relevant character trait to argue he acted consistently with it. A fraud defendant might call witnesses to his reputation for honesty. The prosecution cannot lead with character evidence; it can only respond once the defendant has opened the door.3California Legislative Information. California Code EVID 1102
Sometimes called the mercy rule, this exception comes with a hard trade-off. A defendant who puts character witnesses in front of the jury has just invited the prosecution to rebut with its own witnesses describing him as dishonest, violent, or worse. The strategic cost can be severe, which is why defense attorneys weigh the decision carefully.
The Victim’s Character and the Rape Shield
Section 1103(a) lets a criminal defendant introduce evidence of the victim’s character when it is relevant to the defense. In a self-defense case, that often means showing the victim had a reputation for violence to support the claim that the victim was the aggressor.4California Legislative Information. California Code Evidence Code 1103 All three forms of proof are available: opinion, reputation, and specific instances.
The response is where defendants get caught. Under Section 1103(b), once the defendant attacks the victim’s character for violence, the prosecution can both rebut with evidence of the victim’s peaceful character and offer evidence of the defendant’s own character for violence to show the defendant was the likely aggressor. Attacking the victim exposes the defendant.
Section 1103(c) sharply restricts this exception in sexual assault prosecutions. The defendant generally cannot introduce opinion, reputation, or specific-instance evidence of the victim’s sexual conduct to prove consent, and the statute also bars evidence about how the victim was dressed when offered on consent. Two limits keep the shield from distorting the trial: evidence of the victim’s sexual conduct with the defendant specifically is not barred, and if the prosecution introduces evidence of the victim’s sexual conduct, the defendant may cross-examine on it and offer rebuttal tied to what the prosecution raised.
Propensity Evidence in Sex Offense and Domestic Violence Cases
Sections 1108 and 1109 break from the propensity ban entirely. Under Section 1108, when the defendant is charged with a sexual offense, the prosecution may 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 exact inference Section 1101(a) normally forbids. The California Supreme Court upheld the statute in People v. Falsetta, reasoning that the trial court’s discretion under Section 352 to exclude unfairly prejudicial evidence supplies an adequate safeguard.6Justia. People v. Falsetta (1999) “Sexual offense” is defined broadly, reaching crimes from sexual battery and rape to possession of child pornography. The prosecution must disclose its planned Section 1108 evidence before trial.
Section 1109 extends the same structure to domestic violence, elder abuse, and child abuse charges. When the defendant is charged with any of those offenses, the prosecution can introduce evidence of the defendant’s other acts of the same kind, subject to Section 352.7California Legislative Information. California Code Evidence Code 1109 Unlike Section 1108, Section 1109 contains a time limit: acts occurring 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 how remote the prior acts are. Pretrial disclosure is required.
Prior Acts Offered for a Non-Propensity Purpose
Section 1101(b) is the most heavily litigated pathway for getting prior-act evidence in front of a jury. It permits evidence that a person committed a prior crime or other act when the evidence is relevant to prove something other than a tendency to act that way. The statute lists motive, opportunity, intent, preparation, plan, knowledge, identity, and absence of mistake or accident.1California Legislative Information. California Code Evidence Code 1101
Consider an insurance fraud defendant with three other suspicious claims in his past. Evidence of those claims is not admissible to show he is the kind of person who commits fraud; that is propensity. The same evidence may be admissible to show a common plan or scheme, or knowledge of how to stage a loss. The facts do not change; only the inferential pathway does. Judges scrutinize these offers closely. The prosecution has to identify the non-propensity purpose with precision, and the court still runs the Section 352 balancing. Prior-act evidence that looks like propensity reasoning in disguise will not survive a well-argued motion to exclude.
Character Evidence in Civil Cases
Civil litigation is tighter. Section 1104 bars evidence of a person’s character trait for care or skill when offered to prove the quality of their conduct on a particular occasion, except through the channels in Sections 1102 and 1103, which apply only in criminal cases.8California Legislative Information. California Code Evidence Code 1104 In a car crash case, you cannot show that the other driver is generally careless to prove she drove negligently that day.
The main opening in civil cases is for claims where character itself is an essential element. Defamation is the classic example: when the alleged defamatory statement called the plaintiff dishonest, the plaintiff’s actual character for honesty is directly relevant to truth. Negligent entrustment works the same way, because the driver’s competence is part of the claim rather than background propensity. In those situations, the evidence goes to a fact the jury must decide, not to an inference about typical behavior.
California also has a civil rape shield under Section 1106, which bars defendants in sexual harassment, sexual assault, or sexual battery cases from introducing the plaintiff’s sexual conduct to prove consent or absence of injury. Evidence of the plaintiff’s sexual conduct with the defendant specifically remains admissible, and if the plaintiff introduces evidence of their own sexual conduct, the defendant may cross-examine and offer rebuttal. The structure mirrors the criminal rape shield in Section 1103(c).
Attacking or Supporting Witness Credibility
Credibility is its own world. Section 1101(c) expressly preserves character evidence used to attack or support a witness, so the general ban does not apply.1California Legislative Information. California Code Evidence Code 1101 Section 780 gives the court and jury broad discretion to consider anything with a tendency in reason to prove or disprove truthfulness, including the witness’s character for honesty, prior inconsistent statements, bias, and capacity to perceive or remember.9California Legislative Information. California Code Evidence Code 780
Two restrictions keep this broad mandate from swallowing the rules. Section 786 limits character-based credibility attacks to traits of honesty or veracity. You cannot impeach a witness by showing she is reckless, violent, or irresponsible in general.10California Legislative Information. California Code Evidence Code 786 Section 787 bars specific instances of conduct offered solely to prove a character trait relevant to credibility, with one carve-out: prior felony convictions.11California Legislative Information. California Code Evidence Code 787
Section 788 handles that carve-out: a witness can be impeached by showing a felony conviction, either through cross-examination or by the record of conviction. Exceptions protect witnesses whose convictions have been resolved through pardon based on innocence, a certificate of rehabilitation and pardon, or dismissal under Penal Code Section 1203.4, though 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
One of the most common mistakes in these disputes is treating habit evidence as character evidence. Section 1105 makes habit and custom admissible to prove conduct on a specific occasion with no exception required and no door that needs opening, subject only to Section 352.13California Legislative Information. California Code Evidence Code 1105 Habit is more predictive. A person’s general disposition toward carefulness says little about what she did one Tuesday afternoon, but evidence that she always locks a specific door at 10 p.m. is highly probative of whether she locked it that night.
The line comes down to specificity and repetition. Character is a broad disposition: someone is honest, careful, aggressive. Habit is a specific, semi-automatic response to a recurring situation, like a doctor who always checks a particular vital sign before administering anesthesia or a driver who invariably signals at a certain intersection. Courts look for a regular pattern across many instances. Without a consistent, near-automatic response to a recurring situation, what you have is character evidence in a different outfit, and Section 1101(a) applies.
The Section 352 Balancing Test
Nearly every character evidence exception runs through Section 352, which gives the trial court discretion to exclude evidence when its probative value is substantially outweighed by the probability of undue prejudice, confusion of the issues, or undue consumption of time.14California Legislative Information. California Code Evidence Code 352 For Sections 1108 and 1109, this backstop is what the California Supreme Court pointed to in rejecting due process challenges to propensity evidence in sexual offense cases.6Justia. People v. Falsetta (1999)
In practice, these fights happen on motions in limine before trial. Courts weigh how similar the prior act is to the charged conduct, how remote in time it is, how likely it is to confuse or inflame the jury, and how much trial time will be consumed on a collateral issue. Evidence that technically fits inside an exception can still be excluded if the court concludes the jury is more likely to punish the defendant for being a bad person than to use the evidence for its permitted purpose. Trial judges have wide discretion, and appellate courts rarely disturb a Section 352 ruling.