The semi truck that hit you was recording everything. Speed, braking, steering inputs, and hours behind the wheel — all of that data was captured in the truck's electronic systems. That data could prove exactly what the driver was doing in the seconds before the crash.
But if you intend to take legal action, there's a potential problem: trucking companies don't keep that electronic evidence forever. Some of it can be overwritten in as little as 30 days.
Evidence preservation after a Texas truck accident starts with a single document called a spoliation letter. This letter puts the trucking company on legal notice that they must save all evidence related to your crash. Without it, critical data can disappear — sometimes by routine procedure, sometimes conveniently.
At Suits & Boots Accident Injury Lawyers, we send spoliation letters immediately after taking on truck accident cases in Houston and throughout Texas. The sooner we act, the more evidence we can protect.
Truck Accident Evidence Preservation in Texas: What You Need to Know
- Commercial trucks contain electronic systems that record data about speed, braking, engine performance, and driver behavior before a crash.
- This data can be overwritten or lost within days or weeks if no one takes steps to preserve it.
- A spoliation of evidence letter is a formal demand requiring the trucking company to save all crash-related records and data.
- Federal regulations from the Federal Motor Carrier Safety Administration (FMCSA) set minimum record-keeping requirements, but these don't always protect the most useful data.
- If a trucking company destroys evidence after receiving a preservation letter, Texas courts can impose serious penalties.
What Is a Spoliation Letter and Why Does It Matter?
A spoliation of evidence letter (also called a litigation hold letter or preservation letter) is a formal written notice demanding that the trucking company and its drivers preserve all evidence related to your crash. It creates a legal obligation to save records that might otherwise be deleted, overwritten, or "lost."
Without this letter, trucking companies can claim they followed their normal data retention policies and didn't know you planned to file a claim. With the letter on file, destroying evidence becomes much harder to excuse, and Texas courts can punish companies that do it anyway.
The letter typically goes out to the trucking company, the driver, any maintenance providers, and insurance carriers. It identifies the crash by date and location and lists the specific categories of evidence that must be preserved.
What Does the Truck's "Black Box" Actually Record?
Trucks don't have a single black box like an airplane. Instead, they have multiple electronic systems that capture different types of data. Understanding what's recorded helps explain why preservation is so urgent.
Electronic Control Module (ECM)
The ECM is the truck's main computer. It monitors engine performance and records data about vehicle operation. In an accident, the ECM may capture:
- Vehicle speed in the seconds before impact
- Throttle position and acceleration
- Brake application and timing
- Engine RPM
- Cruise control status
- Hard braking or sudden deceleration events
Retention of semi-truck black box data varies by manufacturer and fleet policy. Some ECMs overwrite data continuously, keeping only the most recent hours or days. Others retain data longer but may purge it during routine maintenance.
Electronic Logging Device (ELD)
Federal law requires most commercial trucks to use ELDs to track driver hours. These devices record when the driver was on duty, driving, or resting. ELD data can show whether a driver exceeded legal limits on consecutive driving hours — a common factor in fatigue-related crashes.
The FMCSA requires carriers to retain ELD records for at least six months, but the device itself may store much less data before overwriting.
GPS and Telematics
Many trucking companies use GPS tracking and telematics systems that record vehicle location, speed, and route history. This data can show exactly where the truck was and how fast it was traveling leading up to the crash.
Fleet management systems sometimes integrate this data with dispatch records, creating a detailed picture of the driver's day.
Dash Cameras and Video
Some trucks have forward-facing or cabin-facing cameras. Video footage showing the moments before a crash can be powerful evidence, or it can disappear if no one demands its preservation.
It takes a lawyer to request and interpret an ECM download. That information can identify which systems the truck used and ensure that data from all of them gets preserved before it's too late.
How Quickly Can Texas Trucking Companies Delete Evidence?
The timelines for data loss vary, but they're often shorter than crash victims expect.
- ECM data may overwrite in as little as 30 days with normal vehicle operation.
- Some event data recorders only store a few "hard brake" or collision events before overwriting older ones.
- Dash cam footage often loops over itself within days unless manually saved.
- GPS tracking history may be retained for weeks or months, but policies differ by company.
- Driver logs and ELD data must be kept for six months under federal rules, but device storage may be shorter.
Routine maintenance, software updates, and vehicle repairs can also trigger data loss. If the trucking company sends the truck out for repairs before anyone preserves the electronic data, that evidence may be gone.
What Other Truck Accident Evidence Must Be Preserved?
Electronic data gets the most attention because it's most at risk, but a complete preservation demand covers much more.
A thorough spoliation letter typically demands preservation of:
- All ECM, ELD, and GPS data from the truck involved
- Dash cam and surveillance video
- Driver qualification files (license, medical certification, training records)
- Hours of service logs for the driver
- Drug and alcohol testing records
- Vehicle inspection and maintenance records
- Dispatch communications and load documentation
- Insurance policies and claims files
- Photographs of the truck and cargo
- Witness statements taken by the company
The Texas Department of Public Safety also investigates serious commercial vehicle crashes. Coordinating evidence preservation with any ongoing investigation helps ensure nothing falls through the cracks.
What Happens If a Trucking Company Destroys Evidence?
Texas courts take evidence destruction seriously, especially when a company received a preservation letter and destroyed records anyway.
Penalties for spoliation can include:
- The court instructing the jury that the destroyed evidence would have been unfavorable to the trucking company
- Prohibiting the company from disputing certain facts the evidence would have addressed
- Striking portions of the company's defense
- Monetary sanctions and attorney fee awards
- In extreme cases, default judgment against the company
Under Texas Rule of Civil Procedure 215.2, courts have broad authority to sanction parties who fail to preserve or produce evidence. When a company knows litigation is likely and destroys records anyway, it will likely face serious consequences.
These penalties don't automatically guarantee you win the case, but they can shift the playing field in your favor when the trucking company has made evidence disappear.
When Should a Spoliation Letter Be Sent After a Texas Truck Accident?
Ideally, a spoliation letter should be sent within days after the crash. The first days after a truck accident are critical for evidence preservation.
Every day that passes increases the risk that:
- ECM data overwrites from continued vehicle operation
- Video footage loops over itself
- The company repairs the truck and loses data in the process
- Witnesses forget details or become harder to locate
- Documents get misfiled, deleted, or "lost"
Your lawyer must treat spoliation letters as Day One priorities in truck accident cases. The goal is to freeze evidence before anyone can make it disappear.
If it has been several days or weeks since your crash, don’t assume the evidence is already gone. Some data may still be recoverable, and acting now is always better than waiting longer.
How Do Federal Trucking Regulations Affect Evidence Preservation?
Commercial trucking is regulated by the federal government, which creates both protections and gaps in evidence.
The FMCSA sets minimum record-keeping requirements under 49 CFR Part 395 for hours of service logs and related documents. Carriers must keep these records for six months. But the regulation doesn't require carriers to preserve ECM data, dash cam footage, or GPS tracking beyond their normal business practices.
This means a trucking company can legally overwrite black box data 30 days after your crash unless someone sends a preservation letter demanding they keep it. The federal rules set a floor, not a ceiling, for what gets saved.
Understanding this gap is one reason truck accident cases require attorneys who know the industry. The evidence that proves your case may not be protected by any regulation unless you take action to preserve it.
Why Standard Car Accident Attorneys May Not Send These Letters
Not every personal injury lawyer handles truck accident cases regularly. Attorneys who mostly deal with car accidents may not realize how quickly trucking evidence can vanish or what systems need to be preserved.
Truck accident cases involve federal regulations, multiple electronic systems, and corporate defendants with legal teams ready to protect them. The evidence preservation process alone requires knowing what to ask for and who to demand it from.
When you're looking for a lawyer after a truck crash, ask specifically about their experience with commercial vehicle cases and whether they send spoliation letters immediately.
FAQs About Texas Truck Accident Evidence Preservation
How long does a trucking company have to keep records under federal law?
U.S. trucking regulations require carriers to retain driver logs and supporting documents for at least six months. However, the electronic devices themselves may not store data that long. The federal minimum doesn't guarantee the evidence will still exist when you need it. Preservation letters close that gap.
Can I get black box data from the trucking company myself?
Technically, you can request it. Realistically, trucking companies rarely hand over damaging evidence without a legal demand. An attorney can send a formal preservation letter, issue subpoenas if needed, and arrange for an expert to download and interpret the data properly.
What if the trucking company already repaired the truck?
Repairs can destroy electronic data stored in the vehicle's systems. If this happened before a preservation letter was sent, some evidence may be gone. However, other records (driver logs, GPS history, maintenance files) may still exist. An attorney can investigate what's recoverable and explore whether the premature repairs support a spoliation claim.
Does the trucking company have to admit the data exists?
Once litigation begins, discovery rules require the company to disclose relevant evidence. If they claim data doesn't exist when it actually does (or did before they destroyed it), that creates serious legal problems for them. Preservation letters help establish what should have been saved.
How much does it cost to hire a truck accident lawyer in Texas?
At Suits & Boots, we handle truck accident cases on a contingency basis. You pay nothing upfront, and we only collect a fee if we recover compensation for you. Sending spoliation letters, arranging ECM downloads, and hiring experts are all part of the work we do on your behalf.
I was in a crash on I-10 in Houston. Does location affect the evidence?
Location affects which law enforcement agencies investigate and which courts have jurisdiction, but evidence preservation principles apply across Texas. Whether your crash happened on I-10, I-45, or a rural highway, trucking company evidence can disappear just as quickly. Acting fast is critical regardless of where the crash occurred.
Don't Let Truck Accident Evidence Disappear Before Your Case Begins
Truck accident cases are often won or lost based on evidence that exists only for a short window after the crash. At Suits & Boots Accident Injury Lawyers, we send spoliation letters on Day 1 to lock down the black box data, driver logs, video footage, and company records that prove what really happened.
Our team serves truck accident victims throughout Houston and Texas who need someone ready to move fast. Start your free investigation and let the Boots secure the evidence while the Suits build your case.