A truck accident preservation letter, also called a spoliation letter, tells a trucking company and other evidence holders to preserve records, electronic data, and physical evidence related to a crash. It can cover black box data, ELD records, dashcam video, maintenance files, driver records, dispatch communications, and the truck itself. Sending the letter quickly matters because some evidence can be overwritten or destroyed long before a lawsuit is filed.
After a serious truck crash, some of the most important evidence is controlled by the trucking company rather than the injured person. Electronic data can be overwritten, video can disappear, and the truck itself may be repaired or returned to service before anyone has a chance to inspect it.
That is why evidence preservation is one of the first issues we look at in a serious trucking case. A properly targeted preservation letter can identify the records, electronic data, and physical evidence that need to be protected while the crash is investigated.
- Preservation letters should be sent as early as possible after a serious truck crash.
- Different companies may possess different pieces of evidence.
- The letter should identify the evidence to preserve with specificity.
- Electronic information may need to be preserved in its original format.
- The tractor and trailer may need to be held for inspection before repair.
- Michigan courts can impose consequences when relevant evidence is improperly destroyed.
- A preservation letter is different from a subpoena or formal discovery request.
What Is a Truck Accident Preservation Letter?
A truck accident preservation letter is a written notice demanding that evidence related to a collision be preserved because litigation is anticipated.
You may also hear it called a spoliation letter, evidence preservation letter, or litigation hold letter. The terminology varies, but the goal is the same: prevent important evidence from being deleted, overwritten, altered, repaired, or destroyed before it can be examined.
This is different from a formal discovery request. Discovery usually occurs after a lawsuit has been filed. A preservation letter can be sent immediately, before litigation begins, when the evidence may be most vulnerable. You can learn more about the broader process in our guide to filing a truck accident lawsuit in Michigan .
That distinction is especially important in commercial truck cases because much of the evidence is controlled by the trucking company or third-party vendors rather than the injured person. Our Michigan truck accident lawyers investigate these cases with that evidence problem in mind from the beginning.
Why Truck Accident Evidence Must Be Preserved Quickly
Truck accident evidence essentially operates on two different clocks.
The first is the electronic overwrite clock. Black box information, onboard video, telematics, and other electronic systems may overwrite older data as the truck continues operating.
The second is the record retention clock. Federal Motor Carrier Safety Administration regulations require trucking companies to retain certain records for specific periods of time. Once those retention periods expire, companies may ordinarily dispose of records in the normal course of business.
These retention requirements are only one part of the federal regulatory framework. Our guide to FMCSA rules and common trucking violations explains the broader safety regulations that apply to commercial carriers and drivers.
How Long Trucking Evidence May Be Retained
| Evidence | Typical Retention Period |
|---|---|
| Hours of service logs and ELD records | 6 months |
| Driver vehicle inspection reports | 90 days |
| Maintenance files | 1 year, plus 6 months after the vehicle leaves carrier control |
| Annual inspection records | 14 months |
| Driver qualification records | Generally 3 years for many required records |
| Accident register | 3 years |
| Drug and alcohol testing records | 1 to 5 years depending on the record |
| ECM or black box information | Device dependent and potentially overwritten much sooner |
| Dashcam footage | Often governed by company or vendor retention settings |
Related Resource:
For a deeper explanation of what electronic truck data can contain and how it may be used in a case, see
Black Box Data in Truck Accident Cases
.
What Evidence Should a Preservation Letter Cover?
A useful preservation demand should identify the evidence relevant to the particular crash rather than simply asking a trucking company to preserve everything.
Depending on the case, that may include:
- Electronic control module and black box data
- Electronic logging device records
- Records of duty status, hours of service, and driver logs
- Dashcam and driver-facing video
- GPS and telematics information
- Driver qualification files
- Driving history and safety records
- Maintenance and repair records
- Driver vehicle inspection reports
- Drug and alcohol testing records
- Dispatch records
- Text messages and electronic communications
- Bills of lading, cargo records, weight tickets, and load information
- Tractor and trailer inspection data
- Photographs and video
- Insurance investigation materials
- Information held by third-party telematics or camera providers
The physical tractor and trailer may also need to be preserved long enough for experts to inspect them before repairs are performed.
Electronic data can be especially important. When appropriate, the demand should seek preservation of the original or native data rather than only a printed summary or report.
Who Should Receive a Truck Accident Preservation Letter?
The trucking company is usually only the beginning.
Evidence can be spread across several businesses or individuals, including the motor carrier, driver, tractor owner, trailer owner, leasing company, insurer, tow facility, maintenance company, freight broker, and third-party technology vendors.
One entity may possess information another does not. For example, the carrier may control driver and dispatch records while a third-party vendor stores GPS or camera data. A tow yard may have possession of the physical truck while an insurer conducts its own investigation.
Identifying the correct evidence holders early can therefore be just as important as identifying the evidence itself. That evidence can later become central to proving negligence in a truck accident case .
How Should a Preservation Letter Be Sent?
A preservation demand should create a clear record showing what was requested, who received it, and when it was delivered.
Depending on the circumstances, delivery may include certified mail, courier or process service, email, or multiple methods at the same time.
Proof of receipt can become important later if there is a dispute about whether a party knew evidence needed to be preserved.
The demand may also need to be supplemented as additional companies, vehicles, electronic systems, or categories of evidence are identified during the investigation.
What Happens If Trucking Evidence Is Destroyed?
Michigan courts can address the destruction or loss of relevant evidence through sanctions within the underlying lawsuit.
In Ward v. Consolidated Rail Corp., 472 Mich 77 (2005), the Michigan Supreme Court addressed principles involving missing evidence and adverse inferences. Other Michigan authority also gives courts tools to address failures to preserve relevant evidence.
Depending on the circumstances, potential consequences can include:
- An adverse-inference instruction
- Restrictions on evidence or arguments
- Other evidentiary sanctions
- More severe sanctions in exceptional circumstances
Michigan generally does not treat spoliation as a separate personal injury claim simply because evidence was destroyed. Instead, the issue is typically addressed within the underlying litigation.
What Happens After the Preservation Letter Is Sent?
Preserving evidence is only the first step.
Once the necessary parties have been notified, the investigation may move toward actually obtaining and analyzing the evidence. Depending on the crash, that can involve inspecting the tractor and trailer, downloading ECM or black box data , obtaining ELD and telematics records, reviewing driver files, analyzing maintenance records, obtaining video, and reconstructing how the collision occurred.
A preservation letter keeps evidence available. It does not replace the investigation needed to understand what that evidence proves.
This distinction matters because truck accident cases often involve technical information that may later need to be interpreted by attorneys, reconstruction experts, engineers, or other specialists.
Can You Send a Preservation Letter Yourself?
There is generally no requirement that an attorney be the person who sends the initial preservation demand.
The larger problem is knowing what evidence exists, which companies possess it, what should be specifically identified, which electronic systems need to be preserved, and whether the tractor or trailer should be held for inspection.
Mistakes involving omitted evidence or overlooked evidence holders may not become obvious until the material is already gone.
For a serious truck accident, preservation should therefore be treated as part of the broader investigation rather than simply as a form letter.
Serious Truck Accident Cases
How The Clark Law Office Handles Truck Accident Evidence
When The Clark Law Office investigates a serious Michigan truck accident, identifying and preserving evidence can begin very early in the case.
That may include identifying the carrier and other responsible companies, locating evidence holders, sending preservation notices, obtaining electronic truck data, and arranging inspection of the tractor or trailer when necessary.
The firm has handled serious commercial vehicle claims, including a $4.75 million Mid-Michigan commercial vehicle recovery.
Past results do not guarantee a similar outcome. Every case depends on its own facts, injuries, insurance coverage, and available evidence.
If you or a family member suffered a serious injury in a commercial truck collision, you can speak directly with Matthew R. Clark about what evidence may need to be protected. Learn more about our Michigan truck accident practice or our Lansing truck accident lawyer page.
Free consultation. No attorney fee unless we recover for you.
Frequently Asked Questions
How quickly should a truck accident preservation letter be sent?
As quickly as reasonably possible after a serious truck crash. Some electronic information may be overwritten much sooner than the federal retention periods that apply to traditional trucking records.
Who should receive a truck accident preservation letter?
Potential recipients can include the motor carrier, driver, truck or trailer owner, insurer, tow yard, maintenance provider, freight broker, and third-party companies that store electronic or video data.
Can I write a spoliation letter myself?
Generally, yes. The larger problem is knowing exactly what evidence should be preserved and identifying every person or company that may possess it.
What happens if a trucking company destroys evidence after receiving notice?
Michigan courts may impose sanctions when relevant evidence that should have been preserved is destroyed. Depending on the circumstances, that can include an adverse-inference instruction or other evidentiary consequences.
Is a preservation letter the same as a subpoena?
No. A preservation letter asks the recipient to maintain evidence. A subpoena is a formal legal mechanism used to require testimony or production of information.
How long is truck black box data stored?
There is no single retention period that applies to every truck or electronic control module. Storage and overwrite behavior vary by system, which is one reason electronic truck data should be addressed quickly.
What is the difference between spoliation and preservation?
Preservation is the act of protecting evidence from alteration or destruction. Spoliation generally refers to the improper loss, alteration, or destruction of evidence relevant to litigation.
How much does it cost to have The Clark Law Office investigate a truck accident?
The Clark Law Office handles qualifying personal injury cases on a contingency fee. There is no attorney fee upfront, and attorney fees are paid from the recovery if the case is successful.
Definition Bank
Spoliation
The destruction, loss, or alteration of evidence relevant to a legal claim.
Preservation letter
A written demand asking someone to preserve identified evidence connected to anticipated litigation.
Litigation hold
A process used to prevent relevant documents or electronic information from being routinely deleted or destroyed.
ECM / black box
Electronic systems capable of recording information such as speed, braking, throttle, engine activity, or fault information.
ELD
An electronic logging device used to record a commercial driver's hours of service.
RODS / HOS
Records of duty status and hours-of-service information showing when a commercial driver was working, driving, or resting.
DVIR
Driver vehicle inspection report documenting certain vehicle condition information.
Driver qualification file
Records maintained by a motor carrier concerning a commercial driver's qualifications and related documentation.
Telematics
Electronic systems that may record GPS location, vehicle activity, driving events, or other fleet information.
Adverse inference
A legal consequence that may allow a jury to draw a negative inference from missing evidence under appropriate circumstances.
Native format
Electronic information maintained in its original digital form rather than only as a printout or summary.
Motor carrier
A company or business responsible for operating commercial motor vehicles.
Entity Cards
Spoliation or Preservation Letter
- What it is
- A written demand to preserve evidence related to anticipated litigation.
- Purpose
- Prevent relevant evidence from being routinely deleted, altered, repaired, overwritten, or destroyed.
- Recipients
- Carrier, driver, truck owner, insurer, tow yard, vendors, and other evidence holders.
- Timing
- Generally as early as practical after a serious crash.
ECM or Truck Black Box
- May record
- Speed, braking, throttle, engine activity, fault information, and other vehicle data.
- Retention
- Varies significantly by manufacturer and system.
- Why it matters
- Can provide objective information about what the truck was doing before or during the collision.
- Preservation
- Electronic data and the physical vehicle may need to be protected before repair or continued operation.
Ward v. Consolidated Rail Corp.
- Court
- Michigan Supreme Court
- Citation
- 472 Mich 77 (2005)
- Issue
- Missing evidence and adverse-inference principles.
- Why it matters
- Provides Michigan authority relevant to evidentiary consequences when important material is unavailable.
The Clark Law Office
- Attorney
- Matthew R. Clark
- Service area
- Lansing and clients throughout Michigan
- Practice area
- Serious car, truck, and personal injury cases
- Relevant result
- $4.75 million Mid-Michigan commercial vehicle recovery
- Consultation
- Free consultation, contingency fee representation
Attorney Review
Legally reviewed by
Matthew R. Clark focuses exclusively on personal injury and wrongful death cases throughout Mid-Michigan. He graduated from Michigan State University College of Law and trained at The Geoffrey Fieger Trial Practice Institute. His practice includes serious car accident, no-fault insurance, and catastrophic injury claims, and he has recovered millions for injured clients while providing direct attorney-level representation from start to finish.