California Evidence Code Section 350 is the state’s basic gatekeeping rule for trials: no evidence is admissible unless it is relevant. Every document, photograph, recording, and piece of testimony offered in a California civil or criminal case has to clear that threshold before a judge or jury can consider it.1California Legislative Information. California Evidence Code 350 The statute is one sentence long, and that brevity is deceptive. What “relevant” means, how judges apply it, and why relevant evidence still gets excluded in real cases are questions that shape outcomes every day.
What the Statute Actually Says
Section 350 states, in full, that no evidence is admissible except relevant evidence.1California Legislative Information. California Evidence Code 350 In practice, it forces every party in every case to justify why each item of proof belongs in the courtroom. If there is no connection between the evidence and a disputed issue, the evidence stays out. The rule keeps trials focused on the actual dispute and prevents juries from being pulled off course by material that has nothing to do with it.
How California Defines Relevant Evidence
Section 350 borrows its meaning from Evidence Code Section 210, which defines relevant evidence as evidence with a tendency in reason to prove or disprove a disputed fact of consequence to the case.2California Legislative Information. California Evidence Code 210 – Relevant Evidence Two things have to line up. The evidence must have some logical connection to a fact, and that fact must actually be contested.
The bar is intentionally low. Evidence does not have to be conclusive, or even strongly persuasive. It only needs a minimal tendency to make a disputed fact more likely or less likely. In a car crash case, eyewitness testimony that the defendant ran a red light clears the bar easily. Testimony about the defendant’s favorite restaurant does not.
Section 210 also expressly covers credibility. If a witness previously made a statement that contradicts what they say on the stand, the prior statement is relevant because it helps the jury decide whether to believe them.2California Legislative Information. California Evidence Code 210 – Relevant Evidence
When Relevance Depends on Proving Something Else First
Some evidence is only relevant if another fact is established. Evidence Code Section 403 addresses this situation, sometimes called conditional relevance. The party offering the evidence carries the burden of producing enough proof of the preliminary fact to sustain a reasonable finding that it exists.3California Legislative Information. California Evidence Code 403
Suppose the plaintiff in a fraud case wants to introduce an email allegedly written by the defendant. The content only matters if the defendant actually wrote it. Authorship is the preliminary fact. Until the plaintiff produces enough evidence pointing to the defendant as the author, the email is inadmissible.
Judges do have flexibility. A court can admit evidence conditionally and let the offering party supply proof of the preliminary fact later. If that proof never comes, the judge instructs the jury to disregard the evidence.3California Legislative Information. California Evidence Code 403 Once a jury has heard something, of course, telling them to unhear it is a tall order.
Relevant Evidence Is Not Automatically Admissible
Clearing Section 350 is necessary, but it is not enough. Evidence Code Section 351 provides that all relevant evidence is admissible, except as otherwise provided by statute.4California Legislative Information. California Evidence Code 351 – Admissibility of Relevant Evidence That exception clause does a lot of work. Numerous other statutes can block evidence that is perfectly relevant.
The Section 352 Balancing Test
The most frequently invoked exclusionary rule is Evidence Code Section 352. It gives judges discretion to exclude relevant evidence when its probative value is substantially outweighed by the risk that admitting it will consume too much time, unfairly prejudice a party, confuse the issues, or mislead the jury.5California Legislative Information. California Evidence Code 352 The word “substantially” is doing real work. All evidence offered against a party is prejudicial in some sense; that is what evidence is for. Judges can only exclude it under Section 352 when the danger clearly outweighs the value.
Graphic crime scene photographs are the classic battleground. They can be relevant to show the severity of an attack, but if medical testimony already establishes the same facts, a judge might find the photographs add little while creating a serious risk of inflaming jurors. Reasonable judges weigh the same factors differently, which is why Section 352 rulings are among the most litigated issues in California trial courts.
Other Rules That Block Relevant Evidence
Section 352 is not the only override. Evidence Code Section 1101 generally bars using evidence of a person’s character or past conduct to prove they acted the same way on the occasion in question. A prior theft conviction may be logically relevant to a new theft charge, but the law keeps it out to prevent juries from deciding cases on character rather than the facts of the incident. Past conduct can still come in when offered for a specific non-character purpose such as motive, intent, plan, knowledge, or identity.6California Legislative Information. California Evidence Code EVID 1101 Hearsay rules, privilege protections, and the rules governing expert testimony can also block relevant evidence. Section 350 is the first checkpoint, not the last.
Evidence Admitted for a Limited Purpose
Admissibility is not always all or nothing. Evidence may be admissible on one issue but not another, or against one party but not a co-defendant. Evidence Code Section 355 requires the court, when asked, to restrict the evidence to its proper scope and instruct the jury accordingly.7California Legislative Information. California Evidence Code 355
In a trial with two defendants, for example, a confession by one may be admissible against that defendant but not the co-defendant. The judge instructs the jury to consider it only against the person who made it. One practical point: if you are entitled to a limiting instruction, you have to ask for it on the record. Failing to request it waives the issue.
How Section 350 Gets Enforced at Trial
The main tool is the objection. When opposing counsel tries to introduce evidence with no logical link to a disputed fact, a lawyer objects on relevance grounds. The judge rules on the spot. If the objection is sustained, the evidence stays out. If overruled, it comes in. The exchange takes seconds and can reshape the trial.
Sometimes the connection is not obvious yet because it depends on something that will emerge later. In that situation, the offering party can explain the theory of relevance to the judge, and courts often allow counsel to “connect it up” as the case develops.
Experienced lawyers do not always wait for trial. A motion in limine, filed before trial starts, asks the judge to rule in advance on whether specific evidence will be admitted or excluded. California has no statute specifically authorizing these motions; the authority comes from the court’s inherent power to manage its proceedings. The advantage is real: a successful motion keeps the evidence from ever being mentioned in front of the jury, so there is no risk that jurors hear something they are later told to ignore.
Protecting a Relevance Ruling for Appeal
Losing a relevance ruling at trial is not necessarily the end, but the appellate window is narrow. Evidence Code Section 353 requires a timely objection or motion to exclude, stated clearly enough that the trial judge understands the specific ground.8California Legislative Information. California Evidence Code 353 Silence when the evidence comes in generally forfeits the right to raise the issue later.
Even with a proper objection on the record, an appellate court will not reverse a verdict for an evidentiary error unless the error resulted in a miscarriage of justice.8California Legislative Information. California Evidence Code 353 That is a high standard. The court has to be persuaded both that the ruling was wrong and that it actually affected the outcome. A small mistake among hundreds of rulings rarely meets the threshold, which is why getting the ruling right at trial matters so much.
When the problem runs the other way, and the judge excludes your evidence, the mechanism is different. The party whose evidence was kept out makes an offer of proof, explaining on the record what the evidence would have shown and why it matters. Without that offer, an appellate court has nothing to review.