What is a spoliation letter and why does my attorney need to send one immediately?

A spoliation letter is a formal legal demand sent to the trucking company requiring them to preserve all evidence related to the crash. This includes ECM black box data, ELD logs, dashcam footage, driver files, and maintenance records. Your attorney needs to send it immediately because key evidence like ECM data can overwrite within 30 days and dashcam footage can loop over itself in days. If the evidence is destroyed after a preservation demand, Louisiana courts can instruct the jury to assume the missing evidence was unfavorable to the trucking company.

How long does a trucking company keep black box and dashcam data?

ECM (black box) data can be overwritten by normal truck operation within 30 days. Some systems overwrite sooner depending on the manufacturer and model. Dashcam footage is typically stored on loop recording systems that overwrite every 72 hours to seven days. ELD (electronic logging device) data has a federal retention requirement of six months, but carriers can claim technical issues or fail to preserve it without a formal preservation demand.

Can I get the truck driver's cell phone records after a crash?

Yes, but it requires legal process. Your attorney can subpoena the driver's cell phone records through discovery once a lawsuit is filed. Before filing suit, a preservation letter can demand the carrier preserve the driver's cell phone records as part of the evidence package. Cell phone records can show whether the driver was texting, making calls, or using apps at the time of the crash.

What does an accident reconstructionist do in a truck accident case?

An accident reconstructionist uses physics, engineering, and physical evidence from the crash scene to determine what happened. They analyze tire marks, gouge marks, debris patterns, and point-of-impact measurements. They combine this scene evidence with ECM data showing the truck's speed and braking to build a second-by-second timeline of the crash. Their testimony is admissible in Louisiana courts under the Daubert standard and is often decisive in disputed liability cases.

How do I check a trucking company's safety record?

The FMCSA maintains public records on every registered motor carrier through the Safety Measurement System at [ai.fmcsa.dot.gov](https://ai.fmcsa.dot.gov/). You can look up any carrier's inspection history, crash data, safety rating, and BASICs scores across seven safety categories. Your attorney should pull these records as a standard part of the investigation to identify patterns of violations that existed before your crash.

What is the deadline to file a truck accident lawsuit in Louisiana?

Louisiana's prescriptive period for personal injury is two years from the date of injury under [La. C.C. Art. 3493.11](https://legis.la.gov/legis/Law.aspx?d=1092220), effective July 1, 2024. This replaced the previous one-year period. However, the deadline to preserve critical evidence is far shorter. ECM data can overwrite in 30 days and dashcam footage in days. Contacting an attorney early protects both your filing deadline and your evidence.

What happens if the trucking company destroys evidence?

If the trucking company destroys evidence after receiving a preservation letter or after reasonably anticipating litigation, Louisiana courts can impose an adverse inference instruction. This tells the jury to presume the destroyed evidence was unfavorable to the trucking company. The court may also impose monetary sanctions or other penalties. However, this remedy only applies if the destruction occurred after the carrier had a duty to preserve, which is why sending a spoliation letter early is critical.

How is a truck accident investigation different from a police investigation?

A police investigation documents the scene and determines whether traffic laws were violated. It produces a crash report that identifies the parties, notes obvious contributing factors, and may assign fault. An attorney's investigation goes further. It preserves electronic evidence (ECM data, ELD logs, dashcam footage) that police do not collect. It pulls FMCSA inspection records and carrier safety history. It retains independent accident reconstructionists to analyze the crash physics. And it investigates the driver's background, qualifications, and employment history across multiple carriers.

How Truck Accident Investigations Work in Louisiana

No one researches truck accident investigations for fun. Something happened on a Louisiana highway, and now you need to understand what evidence exists, how fast it disappears, and what a proper investigation looks like.

This page explains the truck accident investigation process from evidence preservation to accident reconstruction. Morris & Dewett has investigated these cases for 25 years across Louisiana. Read it. Compare our process to other firms. Reach out when you're ready.

Why Truck Accident Investigations Differ from Car Accident Investigations

Truck accident investigations involve five or more potentially liable parties, federal FMCSA regulations layered on top of Louisiana state law, and electronic evidence that can disappear within days. A car accident involves two drivers and two insurance companies. A truck accident investigation involves the driver, the motor carrier, the freight broker, the maintenance contractor, and the company that loaded the cargo. Each one has separate liability exposure. Each one has separate insurance coverage.

Federal regulations from the FMCSA layer on top of Louisiana state law. Commercial trucks operating in interstate commerce must comply with 49 C.F.R. Parts 380 through 399. These federal rules govern driver qualifications, vehicle maintenance, hours of service, and cargo securement. Violations of these rules create independent grounds for negligence.

Louisiana recorded 3,875 large trucks involved in fatal and non-fatal crashes in FY2022 alone, according to FMCSA crash statistics. That volume means trucking companies and their insurers have well-practiced response protocols. They deploy rapid response teams within hours of a crash. These teams photograph the scene, interview witnesses, and begin building the carrier's defense before you have retained an attorney.

The evidence in a truck accident case has short retention windows. ECM data can overwrite within 30 days. Dashcam footage may loop and record over itself in 72 hours. Your investigation needs to move at least as fast as theirs. Ask any attorney you're considering how quickly they begin evidence preservation after you sign. If the answer is vague, that tells you something about their truck accident experience.

What Evidence Disappears Fast After a Truck Accident?

The most valuable evidence in a truck accident case is electronic, and electronic data has expiration dates. Understanding what exists and when it disappears determines whether your case has the proof it needs.

ECM and Black Box Data

The truck's ECM records speed, braking force, throttle position, RPM, and other parameters in the seconds before impact. This data answers the most important question in most truck accident cases: what was the driver doing right before the crash?

ECM data can be overwritten by normal truck operation within 30 days. Some systems overwrite sooner. Without a preservation demand, the carrier has no obligation to pull the data before it is gone. Once it overwrites, it is gone permanently.

ELD Logs and Hours of Service Records

Federal law requires commercial trucks to carry an ELD. The ELD records driving hours, on-duty time, and rest periods. It documents whether the driver was complying with HOS rules at the time of the crash.

The federal retention requirement for ELD data is six months. But carriers can alter data, claim technical malfunctions, or simply fail to preserve it. ELD records that show a driver exceeded the 11-hour driving limit or skipped mandatory rest breaks are powerful evidence of negligence.

Dashcam and Camera Footage

Many commercial trucks carry forward-facing dashcams, and some have trailer-mounted cameras as well. This footage captures the crash itself and the moments leading up to it. The problem is that most carriers use loop recording systems that overwrite footage every 72 hours to seven days.

If no one requests the footage within that window, it is recorded over and lost. Dashcam evidence can be the single most decisive piece of evidence in a liability dispute.

Driver Qualification Files and Dispatch Records

The carrier must maintain a driver qualification file containing the driver's CDL records, medical certificates, drug and alcohol testing history, and prior violation records. These files reveal whether the driver should have been behind the wheel at all.

Dispatch records show what routes were assigned, what delivery deadlines were set, and whether the carrier pressured the driver to exceed safe driving hours. Cell phone records and GPS data from the truck's telematics system fill in additional details about the driver's behavior before the crash. Cargo loading records document weight distribution, securement methods, and hazmat manifests.

When evaluating an attorney for your truck accident case, ask what types of evidence they request beyond the police report. An attorney who only mentions medical records and the crash report is not conducting a truck accident investigation. The evidence categories listed above are the minimum standard for a thorough case workup.

Spoliation Letters and Evidence Preservation

A Spoliation letter is the single most time-sensitive step in a truck accident investigation. It is a formal legal demand sent to the trucking company requiring them to preserve all evidence related to the crash.

What a Spoliation Letter Covers

The letter identifies every category of evidence the carrier must preserve. That includes ECM data, ELD logs, dashcam footage, driver qualification files, dispatch records, maintenance records, and cell phone records. It puts the carrier on legal notice that destroying or altering any of this evidence will have consequences.

Louisiana courts can impose adverse inference instructions when evidence is destroyed after a preservation demand. That means the jury is told to assume the destroyed evidence was unfavorable to the party that destroyed it. This is a powerful tool, but it only works if the preservation letter was sent before the evidence disappeared.

Why Timing Is Everything

The letter must go out within hours or days of the crash. Not weeks. ECM data can overwrite in 30 days. Dashcam footage can loop in days. Driver logs can be altered. Every day of delay narrows the window of recoverable evidence.

Morris & Dewett sends preservation letters within 24 hours of engagement. This is not a marketing claim. It is a procedural step that protects the case. Ask any truck accident attorney you're considering when they send their first preservation demand. The answer reveals their experience with these cases.

Accident Reconstruction in Truck Crash Cases

Accident reconstruction is the process of using physics, engineering, and crash scene data to determine exactly what happened. In truck accident cases, reconstruction often determines liability.

How Reconstructionists Work

A qualified accident reconstructionist visits the crash scene to document physical evidence: tire marks, gouge marks, debris field patterns, and point-of-impact measurements. They combine this physical evidence with the ECM data to build a second-by-second timeline of the crash sequence.

The reconstruction answers critical questions. Was the truck exceeding the speed limit? Did the driver apply brakes, and if so, when? How much time elapsed between the hazard appearing and the driver taking evasive action? Was the truck overloaded or carrying improperly secured cargo that affected vehicle dynamics?

Expert Testimony and Admissibility

Reconstructionist testimony is admissible in Louisiana courts under the Daubert standard. The expert must demonstrate that their methodology is scientifically sound, based on sufficient data, and applied to the facts of the case. In disputed liability cases, reconstruction testimony is often the most influential evidence presented to the jury.

Modern reconstructionists use digital photogrammetry and 3D scanning to capture crash scenes with precision that traditional surveying cannot match. These technologies create detailed digital models of the scene that can be presented as demonstrative evidence at trial. Ask any attorney you're evaluating whether they retain independent reconstructionists and what technology those experts use. Firms that rely on police reports alone are leaving critical evidence unexamined.

FMCSA Inspection Records and Regulatory Violations

The FMCSA maintains inspection and safety records for every registered motor carrier in the United States through the Safety Measurement System. These records are public. They document the carrier's crash history, inspection violations, and safety ratings.

Pre-Crash Inspection History

A carrier's inspection history can reveal patterns of violations that existed before your crash. Repeated brake deficiencies. Chronic tire issues. Recurring HOS violations. This pattern evidence supports a claim that the carrier knew about safety problems and failed to correct them. That is evidence of negligent maintenance or negligent supervision.

The FMCSA Large Truck Crash Causation Study found that 87% of truck crashes were caused by driver action or inaction. Vehicle issues accounted for 10%. Environmental factors accounted for 3%. Common inspection violations include hours-of-service breaches, brake system deficiencies, cargo securement failures, and driver qualification deficiencies.

Out-of-Service Violations and BASICs Scores

An out-of-service violation means a federal inspector found the truck or driver so unsafe that the vehicle was ordered off the road. If the carrier had recent out-of-service violations on the same truck or driver involved in your crash, that evidence is significant.

The SMS tracks carrier performance across seven safety categories called BASICs scores. These categories cover unsafe driving, crash rates, HOS compliance, vehicle maintenance, controlled substance use, hazmat compliance, and driver fitness. High BASICs percentile scores indicate the carrier performs worse than most of its peers. Ask your attorney whether they pull FMCSA records on the carrier and driver as part of their investigation. If they don't know what a BASICs score is, that is a red flag.

How Morris & Dewett Investigates Truck Accident Cases

Morris & Dewett has handled truck accident cases in Louisiana for 25 years. Over 5,000 injury cases total across the firm. Here is the specific process we follow when a truck accident case comes in.

The preservation letter goes out within 24 hours of engagement. It targets every category of electronic and documentary evidence the carrier possesses. We do not wait for the carrier to respond. We follow up with formal discovery requests to enforce the preservation demand.

We retain independent accident reconstructionists who inspect the crash scene and analyze ECM data. Our experts are not affiliated with any carrier or insurance company. They work for the case, not for the defense.

We pull FMCSA records on both the carrier and the individual driver. Inspection history, violation patterns, safety ratings, BASICs scores, and crash history. We investigate the driver's background: CDL history, prior accidents, drug and alcohol testing records, and employment history across previous carriers.

We analyze maintenance records to identify deferred repairs, skipped inspections, and known defective parts that were not replaced. We review cargo and loading documentation for overweight loads, improper securement, and hazmat manifest discrepancies.

This process is not unusual for firms that handle truck accident cases regularly. It should be standard. When you're evaluating attorneys, ask them to walk you through their investigation process step by step. Compare it to what you've read here. The answer tells you whether they have done this before.

Why Timing Matters in Truck Accident Investigations

Louisiana's Prescriptive Period for personal injury claims is two years from the date of injury under La. C.C. Art. 3493.11. But evidence preservation deadlines are far shorter than the filing deadline.

ECM data can overwrite in 30 days. Dashcam footage can loop in days. Witness memories degrade within weeks. Physical evidence at the crash scene gets cleared by highway crews, often within hours. The legal deadline to file suit is two years. The practical deadline to preserve the evidence that wins the case is days.

Trucking companies begin their own investigation within hours of a crash. Their rapid response teams are at the scene while you are still in the hospital. Insurance company adjusters will visit the scene and interview witnesses before you have spoken to an attorney. Every day you wait gives the carrier's defense team more time to control the narrative.

Louisiana's changing road conditions make this urgency even more acute. Richland Parish saw truck crashes increase over 600% near the Meta data center construction site between 2024 and 2026. Construction zones, new traffic patterns, and unfamiliar routes create crash conditions that can change between the day of the accident and the day an investigator arrives. Early investigation captures the scene as it was, not as it becomes.

Louisiana also applies Comparative Fault under La. C.C. Art. 2323. If you are 51% or more at fault, you recover nothing. The trucking company's defense will focus on shifting fault to you. A thorough early investigation locks down evidence that establishes the carrier's fault before the defense builds its counter-narrative.

Frequently Asked Questions

What is a spoliation letter and why does my attorney need to send one immediately?: A spoliation letter is a formal legal demand sent to the trucking company requiring them to preserve all evidence related to the crash. This includes ECM black box data, ELD logs, dashcam footage, driver files, and maintenance records. Your attorney needs to send it immediately because key evidence like ECM data can overwrite within 30 days and dashcam footage can loop over itself in days. If the evidence is destroyed after a preservation demand, Louisiana courts can instruct the jury to assume the missing evidence was unfavorable to the trucking company.
How long does a trucking company keep black box and dashcam data?: ECM (black box) data can be overwritten by normal truck operation within 30 days. Some systems overwrite sooner depending on the manufacturer and model. Dashcam footage is typically stored on loop recording systems that overwrite every 72 hours to seven days. ELD (electronic logging device) data has a federal retention requirement of six months, but carriers can claim technical issues or fail to preserve it without a formal preservation demand.
Can I get the truck driver's cell phone records after a crash?: Yes, but it requires legal process. Your attorney can subpoena the driver's cell phone records through discovery once a lawsuit is filed. Before filing suit, a preservation letter can demand the carrier preserve the driver's cell phone records as part of the evidence package. Cell phone records can show whether the driver was texting, making calls, or using apps at the time of the crash.
What does an accident reconstructionist do in a truck accident case?: An accident reconstructionist uses physics, engineering, and physical evidence from the crash scene to determine what happened. They analyze tire marks, gouge marks, debris patterns, and point-of-impact measurements. They combine this scene evidence with ECM data showing the truck's speed and braking to build a second-by-second timeline of the crash. Their testimony is admissible in Louisiana courts under the Daubert standard and is often decisive in disputed liability cases.
How do I check a trucking company's safety record?: The FMCSA maintains public records on every registered motor carrier through the Safety Measurement System at [ai.fmcsa.dot.gov](https://ai.fmcsa.dot.gov/). You can look up any carrier's inspection history, crash data, safety rating, and BASICs scores across seven safety categories. Your attorney should pull these records as a standard part of the investigation to identify patterns of violations that existed before your crash.
What is the deadline to file a truck accident lawsuit in Louisiana?: Louisiana's prescriptive period for personal injury is two years from the date of injury under [La. C.C. Art. 3493.11](https://legis.la.gov/legis/Law.aspx?d=1092220), effective July 1, 2024. This replaced the previous one-year period. However, the deadline to preserve critical evidence is far shorter. ECM data can overwrite in 30 days and dashcam footage in days. Contacting an attorney early protects both your filing deadline and your evidence.
What happens if the trucking company destroys evidence?: If the trucking company destroys evidence after receiving a preservation letter or after reasonably anticipating litigation, Louisiana courts can impose an adverse inference instruction. This tells the jury to presume the destroyed evidence was unfavorable to the trucking company. The court may also impose monetary sanctions or other penalties. However, this remedy only applies if the destruction occurred after the carrier had a duty to preserve, which is why sending a spoliation letter early is critical.
How is a truck accident investigation different from a police investigation?: A police investigation documents the scene and determines whether traffic laws were violated. It produces a crash report that identifies the parties, notes obvious contributing factors, and may assign fault. An attorney's investigation goes further. It preserves electronic evidence (ECM data, ELD logs, dashcam footage) that police do not collect. It pulls FMCSA inspection records and carrier safety history. It retains independent accident reconstructionists to analyze the crash physics. And it investigates the driver's background, qualifications, and employment history across multiple carriers.

These answers reflect Louisiana law as of January 2026. For case specific advice, consult with a Louisiana personal injury attorney who can evaluate your particular circumstances.