A spoliation letter is a formal demand that requires a trucking company to preserve evidence, including the truck’s black box data, before it can be overwritten, repaired or thrown away. Sending it quickly is one of the most important steps after a serious crash with an 18-wheeler, box truck, dump truck or any other commercial vehicle.
A truck’s electronic control module and related systems can record speed, braking, throttle and other data from the moments before a crash. That data does not stay forever. Once the truck goes back into service, new driving can replace it, and dash cam footage and dispatch messages can be deleted on routine schedules.
The people hurt most in these crashes are rarely the truck drivers. National Safety Council figures for 2024 show 161,201 people injured in crashes involving large trucks, and about 72 percent of those injuries were suffered by people in other vehicles.
If you were hurt by a commercial truck in San Antonio, talk to a lawyer before the trucking company’s rapid-response team decides what evidence survives. Call 210-TREVINO for a free case review.
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What Is a Spoliation Letter in a Texas Truck Accident Case?
A spoliation letter, also called a preservation letter or litigation hold demand, is written notice to a trucking company and its insurer that a claim is likely and that all evidence related to the crash must be kept. “Spoliation” means destroying, altering or failing to preserve evidence.
Under Texas law, a party’s duty to preserve evidence arises when it knows or reasonably should know there is a substantial chance a claim will be filed and that the evidence is relevant, a standard the Supreme Court of Texas described in Wal-Mart Stores, Inc. v. Johnson (Tex. 2003). A spoliation letter removes any doubt that the trucking company knew.
What Data Does a Truck’s Black Box Record?
Most modern commercial trucks have an engine control module and other onboard systems that can store crash-related data, and many fleets add electronic logging devices, GPS tracking and cameras. Depending on the truck and its equipment, these systems may show:
- Vehicle speed and engine RPM before the crash.
- Hard-braking events, brake application and throttle position.
- Cruise control status and sudden deceleration.
- Hours of service records from the electronic logging device.
- GPS location, route history and dispatch messages.
- Forward-facing and driver-facing camera video.
This data can confirm or contradict the driver’s account. It works best alongside video, so see our guide to securing dash cam evidence after a truck crash in Texas.
How Fast Can Truck Black Box Data Be Lost?
Black box data and camera footage can be lost within days or weeks if the truck is repaired and put back on the road, because many systems record over older data as the truck keeps driving. Trucking companies want their equipment earning money again, and their insurers often send response teams to the scene within hours.
That is why a spoliation letter should be sent as soon as possible after the crash. It is one part of a broader plan to preserve truck accident evidence in Texas, which also includes photos, witness statements and an independent inspection of the truck.
What Should a Spoliation Letter for a Truck Crash Include?
A strong spoliation letter identifies the crash, the truck and the company, and it lists every category of evidence to preserve, from electronic data to the physical truck. A vague letter invites the argument that the company did not know what to keep. Our letters typically demand preservation of:
- The tractor, trailer and their components, without repair or alteration until inspected.
- Engine control module, event data recorder and electronic logging device data.
- Dash cam and driver-facing camera footage.
- Driver logs, hours of service records and supporting documents such as fuel and toll receipts.
- Dispatch communications, GPS data and cell phone records.
- Maintenance, inspection and repair records.
- The driver’s qualification file, drug and alcohol testing and training records.
- Load, cargo and bill of lading documents.
Each record can point to a different kind of negligence. Learn more about how trucking company negligence is proven in Texas.
How Do Federal Record Rules Compare to Texas Preservation Duties?
Federal Motor Carrier Safety Administration rules set minimum retention periods for some records, but once a claim is reasonably anticipated, the duty to preserve relevant evidence can extend well beyond those minimums.
| Evidence | Federal minimum retention | After a spoliation letter |
|---|---|---|
| Hours of service records and supporting documents | 6 months | Preserve relevant records |
| Vehicle maintenance and inspection records | 1 year, and 6 months after the vehicle leaves the carrier’s control | Preserve relevant records |
| Engine control module and camera data | No specific federal retention period | Preserve before it is overwritten |
| The truck itself | None | Hold for inspection before repair |
Federal minimums are only a floor. They do not allow a trucking company to discard evidence it knows is relevant to a pending or likely claim.
What Happens If a Trucking Company Destroys Evidence After a Spoliation Letter?
If a trucking company fails to preserve evidence it had a duty to keep, a Texas trial court can impose a remedy, and in serious cases it can instruct the jury that it may presume the missing evidence would have hurt the trucking company.
In Brookshire Bros., Ltd. v. Aldridge (Tex. 2014), the Supreme Court of Texas held that the trial court, not the jury, decides whether spoliation occurred and what remedy fits. The Court reserved a spoliation instruction for cases where a party intentionally concealed or destroyed evidence, or negligently failed to preserve it and the other side was irreparably deprived of any meaningful ability to present its claim. A clear, early spoliation letter makes it much harder for a company to claim it did not know the evidence mattered.
When Does a Spoliation Letter Not Guarantee the Data?
A spoliation letter cannot bring back data that was already overwritten before it arrived, or recover data from a module destroyed in the crash. Some trucks also record less than others, depending on the make, model and equipment.
When electronic data is missing, the case can still be built with accident reconstruction, physical evidence from the scene, witness testimony, police reports and the company’s own records. Acting early gives you the most options.
Spoliation Letters for Truck Accidents: Quick Answers
Can I Send a Spoliation Letter Myself?
You can, but trucking companies take a letter from a law firm that is ready to litigate more seriously. A lawyer also knows which companies to send it to and what categories of evidence to list.
Do Spoliation Letters Cover Driver Logs and Dispatch Records?
Yes. A complete letter covers hours of service records, dispatch messages, GPS data and maintenance files, not only the black box.
Do Spoliation Letters Apply to Box Trucks, Dump Trucks and Delivery Vans?
Yes. Any commercial vehicle with onboard data, cameras or business records can be covered. See our pages on box truck accidents and dump truck accidents.
How Long Do I Have to File a Truck Accident Lawsuit in Texas?
Most Texas personal injury lawsuits must be filed within two years of the crash, but evidence can disappear in days, so the spoliation letter should go out long before that deadline.
Why Hire Trevino Injury Law for a Truck Accident Evidence Fight?
Trucking companies and their insurers move fast after a crash. Trevino Injury Law sends preservation demands right away, arranges independent downloads and inspections, and prepares every case for trial so the evidence is ready for a Bexar County jury. We secured a $17 million settlement in a head-on collision case involving three fatalities. Prior results do not guarantee a similar outcome.
Want to Protect the Full Value of Your Claim?
You’ve seen how this affects your case—but it is only one piece of the puzzle. Our Truck Accident Lawyer page breaks down what a trial-ready firm does differently.
Evidence that disappears in the first weeks after a crash can decide the value of a truck accident case. Injured families across South Texas trust a plaintiff trial firm that litigates, not just settles to lock that evidence down and use it in court.
Call 210-TREVINO for a free, confidential consultation. Se Habla Español. You pay nothing unless we win.
