Truck crash evidence disappears in 30 days
Commercial vehicle cases are won with corporate records, not eyewitness memory. Nearly all of those records have retention periods measured in weeks, and a carrier's rapid-response team is typically on scene the same day as the police.
01What exists after a commercial collision
A modern tractor generates a detailed account of the seconds before impact, and the carrier generates a paper record of every decision that put that driver on the road.
- ECM / "black box" data: speed, throttle, brake application, hard-braking events
- Electronic logging device records showing hours of service and violations
- Dashcam and forward-facing camera footage, often on short retention cycles
- Dispatch communications, load manifests, and delivery-window pressure
- Driver qualification file, prior violations, and drug and alcohol testing records
- Maintenance and inspection history for brakes, tires, and lighting
02Why the clock is so short
Telematics platforms overwrite. Camera systems loop. Repair or salvage of the tractor can destroy the module entirely. Absent a written preservation demand identifying each category, a carrier's routine retention policy legally erases the most persuasive evidence in the case.
03Spoliation letters and the claims that follow
A preservation letter sent immediately does two things: it protects the evidence, and it creates the record needed to seek sanctions or an adverse-inference instruction if the evidence disappears anyway. Independent negligence claims against the carrier — negligent hiring, retention, training, supervision, and entrustment — depend almost entirely on documents the carrier controls.
This article is general information about California and Nevada law and is not legal advice. Reading it does not create an attorney-client relationship. Outcomes depend on the specific facts of each matter; prior results do not guarantee a similar outcome.