How firms assess whether fault is clear

"Clear liability" does not mean you know who was at fault. It means the evidence makes it hard for the other side to argue otherwise. Firms screen for that, because a fault dispute is expensive and its result is uncertain.

What firms look at

The police or incident report

For a crash, the CHP or local traffic collision report records the officer's diagram, statements, and any citation. It carries weight with an adjuster even though it is generally not admissible at trial. A report that assigns the violation to the other driver is a strong start; one that is silent or blames you is a problem to work through.

More: how to read a California traffic collision report.

Independent witnesses

A neutral witness — not a passenger, not a friend — who saw the event and will say the same thing later is one of the most valuable things a case can have. Firms try to identify and reach them early, before memories fade and before they become hard to find.

Physical evidence

Vehicle damage patterns, final resting positions, skid marks, debris fields, and property damage all tell a story that a witness cannot change. Photos taken at the scene, and preserved vehicles, matter for exactly this reason.

Traffic-law violations

A violation of a safety statute — speeding, running a red light, an unsafe left turn, following too closely — can establish negligence in itself when it caused the type of harm the law exists to prevent. This is "negligence per se," and it shifts the argument from "were they careless" to "did they break the rule."

Sources: Evid. Code, § 669 (presumption of negligence from violation of a statute); CACI No. 400 (negligence — essential factual elements) and CACI No. 418 (presumption of negligence per se), Judicial Council of California Civil Jury Instructions (2026 edition).

Admissions

"I didn't see you." "I looked down for a second." Statements made at the scene, to an officer, or on a recorded call can settle the fault question. This cuts both ways, which is why what you say to an adjuster matters.

More: recorded statements.

Comparative fault

California reduces a recovery by the injured person's share of the fault but does not bar the claim (Li v. Yellow Cab Co. (1975) 13 Cal.3d 804; CACI No. 405). Firms still weigh comparative fault carefully, because a case where a jury might assign you a large share is harder to plan around than one where fault sits almost entirely on the other side.

Sources: Li v. Yellow Cab Co. (1975) 13 Cal.3d 804; CACI No. 405 (comparative fault of plaintiff). The doctrine in general: comparative fault.

The disputed-liability discount

When fault is genuinely contested, an insurer values the claim lower than it would if fault were admitted, because there is a real chance a jury finds for the defense. That discount is why "clear liability" is worth so much, and why the first job in most cases is to close off the other side's version of events.

Common questions

How do lawyers determine who was at fault?

They assemble the record: the police or incident report, independent witness accounts, physical evidence and photos, any traffic-law violation, and any admission. Then they weigh how hard it would be for the other side to tell a different story a jury would believe.

Does a police report decide fault?

No. A California traffic collision report records the officer's findings and any citation, and it is persuasive, but it is generally not admissible at trial and does not bind anyone. It is a starting point, not the answer.

What is "negligence per se"?

When someone violates a safety law — a speed limit, a red light, a right-of-way rule — and that violation causes the kind of harm the law was meant to prevent, the violation can establish negligence without separately proving carelessness (Evid. Code, § 669).

Can I still have a case if I was partly at fault?

Yes. California uses pure comparative fault: your share reduces the recovery but does not bar the claim (Li v. Yellow Cab Co. (1975) 13 Cal.3d 804). Firms do weigh how a jury might split the fault, because a wide range makes the case harder to value.