How Insurance Companies Investigate Car Accident Fault

What an Insurance Adjuster’s Job Actually Is

After a car accident, the at-fault driver’s insurance company assigns a claims adjuster to your case. That adjuster’s role is not to figure out what’s right — it’s to limit the amount their company pays out. Every decision they make, from how they read the police report to how they weight witness statements, is filtered through that financial lens.

Adjusters are trained investigators. They review physical evidence, pull camera footage, analyze damage patterns, and sometimes bring in professional accident reconstruction firms. The information they gather shapes an official fault percentage that directly controls your settlement offer. Understanding that process is the first step to protecting your claim.

Step 1: The Police Report — The Foundation, Not the Final Word

Every adjuster starts with the official police report. It contains the responding officer’s narrative, a crash diagram, contributing factor codes, citation information, and preliminary fault observations. A citation issued at the scene — for speeding, running a red light, or failure to yield — is a powerful indicator of negligence that adjusters use immediately.

That said, the police report is not the final ruling on civil liability. Officers write reports under time pressure without the benefit of full investigation, and their conclusions can be wrong or incomplete. Adjusters know this, which is why they don’t stop at the report — they build on it. If the report leaves room for any shared fault, they will look for evidence to assign some of it to you.

Step 2: Scene Evidence — Skid Marks, Damage, and Debris

Physical evidence at the crash scene tells a story that words can’t change. Trained adjusters and accident reconstruction professionals analyze skid mark length and direction to estimate pre-impact speed. They study vehicle damage patterns — where the cars made contact and at what angle — to reconstruct the exact sequence of the collision.

Debris fields, final resting positions of vehicles, and road surface conditions all contribute to the picture. If your car shows frontal damage consistent with rear-ending another vehicle, that physical evidence will be used against a claim that the other driver cut you off without warning.

Step 3: Witness Statements and Camera Footage

Independent eyewitnesses carry significant weight in fault investigations because they have no financial stake in the outcome. Adjusters seek out and formally interview anyone who saw the crash from a neutral vantage point. Those accounts are then cross-referenced against each driver’s version of events to identify inconsistencies.

Simultaneously, adjusters work to pull every available video record. Traffic cameras, business surveillance systems, dashcams, and even nearby homeowners’ Ring devices are all potential evidence sources. Time is critical here — many systems overwrite footage within 24 to 72 hours. If the video shows the crash clearly, it often determines fault on its own.

Step 4: Accident Reconstruction — When Things Get Formal

In serious crashes involving significant injury, death, or contested liability, insurance companies bring in professional accident reconstruction analysts. These engineers use the evidence gathered in previous steps — along with physics-based modeling, road surface measurements, and vehicle dynamics data — to produce a formal reconstruction of how the collision occurred.

• Speed calculations from crush depth, skid mark length, and momentum analysis
• Pre-impact trajectory modeling based on debris and tire marks
• EDR data cross-referenced with witness accounts
• Traffic light cycle timing to verify who had the right of way
• Weather and road condition data for the time of the crash

Reconstruction reports carry significant authority in both settlement negotiations and litigation. They are expensive to produce and equally expensive to challenge — which is one reason having an attorney review contested fault findings before you accept a settlement matters.

Step 5: Comparative Negligence — How Adjusters Assign Percentages

Kentucky is a pure comparative fault state under KRS 411.182. That means fault is apportioned as a percentage among all parties, and each person’s recovery is reduced by their own share of blame. Unlike some states that bar recovery if you’re more than 50% at fault, Kentucky allows recovery regardless — but every percentage point matters.

Adjusters use the evidence gathered above to build a fault percentage they present as their company’s official position. Common tactics include:

• Inflating your speed: Using witness estimates or EDR data selectively to push your speed higher than it was
• Raising distraction: Referencing cell phone records or your own statements to suggest inattention
• Citing failure to avoid: Arguing you had time to react and didn’t, adding a few percentage points of comparative fault
• Pre-existing conditions: Claiming your injuries predated the accident to separate your damages from the crash

Even a 20% fault assignment on a $100,000 claim costs you $20,000. Adjusters know the math, and they work it in their company’s favor.

How Sam Aguiar Injury Lawyers Respond to Adjuster Investigations

When you retain Sam Aguiar Injury Lawyers, we step between you and the adjuster immediately. We issue preservation letters to lock down camera footage and EDR data before it disappears. We gather our own witness statements and, when needed, retain independent reconstruction analysts whose conclusions aren’t filtered through the insurance company’s financial interest.

Our Bigger Share Guarantee® means you take home more of your settlement. We keep less so you get more — and we work to maximize your recovery at every stage of the fault determination process. Insurance companies will try and minimize your pain. We don’t let that happen.