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November 2026

Preservation Letters in Trucking Cases: What to Send and When

A preservation letter is a written notice to a trucking company, and often its insurer, that a claim is coming and that it must keep every record and piece of equipment tied to the crash. In a truck case it should go out fast, because some of the most important data can be overwritten in the ordinary course of business. It names the evidence specifically: the truck, the trailer, the engine data, the driver’s logs, and the company’s hiring and maintenance files.

If you were hurt in a collision with a commercial truck, this letter is one of the first moves a lawyer makes. Below we explain what it does, what it should say, who should receive it, and where its limits are.

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TL;DR

  • A preservation letter (also called a spoliation or litigation hold letter) puts the trucking company on written notice to keep crash-related evidence.
  • Send it within days, not weeks. Engine control module data can be overwritten by later driving, and some federally required records are kept for only months.
  • A good letter is specific: it lists the truck, trailer, electronic data, driver file, logs, inspection reports and communications, and goes to every party that holds them.
  • The letter helps trigger the duty to preserve, but it does not guarantee compliance. If the evidence is at real risk, a court order may be needed.
  • If evidence is lost after notice, a court can impose sanctions, including an instruction telling the jury it may infer the lost evidence was unfavorable.

Table of Contents

What a preservation letter does in a truck accident case

In litigation, a preservation letter is a written directive telling the people who hold documents and electronically stored information (ESI) to keep them because a dispute is anticipated. Federal court guidance on litigation holds describes it in just those terms, and notes that it may also be called a stop destruction request.

In a trucking case, the letter does three practical things:

  1. It gives notice. The company can no longer say it did not realize a claim was coming.
  2. It defines the evidence. A letter that names the truck’s engine data and the driver’s logs leaves less room for “we didn’t know you wanted that.”
  3. It starts a paper trail. If something goes missing later, the letter shows exactly what was requested and when.

Truck cases need this more than most injury claims. A commercial carrier runs dispatch systems, onboard electronics and driver files that a private driver does not have. Much of it is created automatically and erased automatically. For the full picture of what a truck claim involves, see our Truck Accident Evidence Checklist.

Does the letter legally force the company to keep evidence?

Not by itself. The duty to preserve exists independently of the letter. Federal guidance says the obligation begins when a party knows or should have known evidence is relevant to future or current litigation. A serious truck crash with injuries is the kind of event that puts a carrier on that notice.

So why send the letter? Because it removes doubt. In a 2026 federal case, Sandoval v. Dustar Express, the court noted that Rule 37(e) does not require a preservation letter, but that such letters can explicitly alert a party to impending litigation and trigger the duty to preserve. The same case treated the duty as attaching when the letter was received.

The law of spoliation differs from state to state, and Florida has its own rules. Our article on spoliation of evidence in Florida goes into how that works for lawyers handling these cases.

Does the letter legally force the company to keep evidence?

When to send a preservation letter after a truck crash

The short answer: as soon as a lawyer is involved, and ideally within the first days. The legal trigger is reasonable anticipation of litigation, which does not require a filed lawsuit or a formal demand. That same source points out that engine control module data can be overwritten by the next hard-braking event on a later trip, sometimes within hours of the crash.

The federal regulations add a second clock. A motor carrier must keep records of duty status and supporting documents for at least six months from the date of receipt. It must keep driver vehicle inspection reports for three months. Those are minimum retention periods. After they pass, a carrier’s routine practice may be to discard the records. A letter sent late may arrive after routine deletion has already happened.

Timeline of truck evidence preservation deadlines

In Sandoval, plaintiffs’ counsel sent preservation letters less than a week after the crash. That timing mattered when the court later examined what the carrier did with its data.

What to do before a lawyer is hired

You do not have to wait to protect your own evidence. Photograph the vehicles, the scene and your injuries. Save medical records, repair estimates and every message from the carrier or its insurer. Do not give a recorded statement to the trucking company’s insurer before you have spoken to an attorney. Then call a lawyer quickly so the letter can go out.

What evidence the letter should identify

A generic demand to keep “all evidence” is weak. The strongest letters read like a checklist of where evidence lives, in which form, and who controls it. The categories below are what we would expect a thorough truck letter to cover.

Category What to name Why it matters
The truck and trailer Tractor, trailer, VIN, unit numbers, damaged parts, tires, brake components Physical condition and mechanical failure
Engine and onboard data Engine control module data, event data, any collision-mitigation or camera systems Speed, braking, and what happened before impact
Driver logs Electronic logging device data, records of duty status, supporting documents Hours of service and fatigue
Inspection and maintenance Driver vehicle inspection reports, repair orders, maintenance schedules Whether known defects were fixed
Driver qualification file Application, background checks, training, drug and alcohol testing, prior violations Hiring and supervision
Dispatch and communications Dispatch records, GPS and telematics, phone and messaging records, emails Schedule pressure and distraction
Cargo and trip records Bills of lading, weight tickets, load securement documents, fuel and toll receipts Overloading and the driver’s actual route and timing
Company policies Safety manuals, hiring policies, retention policies How the carrier is supposed to operate

A few of these deserve more explanation.

Black box and engine data

The engine control module and related onboard systems can record how the truck was moving in the moments before a crash. This is often the most objective evidence of speed and braking, and it is the kind most at risk of being overwritten. In Chappell v. SRT Express (D.S.D. 2026), a federal court granted a rebuttable adverse inference instruction where the defendant’s loss of critical truck data prejudiced the plaintiffs’ ability to get objective evidence of the crash.

Logs and hours of service

Driver fatigue and false logs are recurring themes in truck litigation. Electronic logging data and the supporting documents behind it, such as fuel receipts and dispatch records, can show whether a driver was over hours. Our guides on the electronic logging device and on hours of service violations explain how that evidence shapes a claim.

Inspection reports

A daily inspection report can show that a brake or tire problem was reported and either repaired or ignored. Because of the short retention period, these are among the first records worth naming. See what a truck inspection report (DVIR) is.

Hiring and supervision files

If the carrier hired or kept an unsafe driver, the driver’s file may be central to the case. We explain the theory in negligent hiring in trucking.

Who should receive the letter

The driver’s employer is the obvious recipient, but it is rarely the only one. Evidence in a trucking crash is spread across several parties, and a letter sent only to one of them leaves gaps.

Common recipients include:

  • The motor carrier, at its registered address and, where known, its safety or risk department.
  • The carrier’s insurer, which often investigates quickly and holds its own file.
  • The driver, individually, for personal phone records and messages.
  • The truck owner or leasing company, if the tractor or trailer is leased or owned by a different entity.
  • The freight broker or shipper, whose dispatch and load records may matter.
  • Maintenance vendors and telematics providers, who may hold repair and data records the carrier does not.

Federal court guidance for discovery planning recognizes this point. A rule-based e-discovery conference guide asks practitioners to consider whether preservation notices should go to non-parties who may hold significant information, including whether those non-parties should be reimbursed for the costs of preserving it.

The letter should go by a method that proves delivery, such as certified mail with return receipt alongside email. Keep the proof.

What a strong letter includes

A useful letter is precise and proportionate. Here is how we think about drafting one:

  1. Identify the crash. Date, time, location, vehicles, drivers, and the claim the letter concerns.
  2. State that litigation is anticipated. This is the notice that triggers the duty.
  3. List the evidence by category and source. Name the systems, not just the data. “The truck’s engine control module” is better than “black box data.”
  4. Cover physical evidence. Ask that the tractor and trailer not be repaired, sold or scrapped until the parties can inspect them.
  5. Address automatic deletion. Ask the recipient to suspend any routine overwriting, auto-delete or recycling that could affect the listed data.
  6. Request an inspection window. Propose a reasonable way for your expert to download and examine the data.
  7. Ask for confirmation in writing. A reply that the hold is in place, or silence, both become useful later.

Proportionality matters. One practitioner’s widely read guide to preservation letters cautions that a demand for everything, which seeks to paralyze an opponent, tends to draw neither compliance nor enforcement, and that a court will not sanction failure to comply with an onerous demand absent misconduct. A focused, reasonable letter is both fairer and more effective.

What happens if the company ignores it

Ignoring a clear preservation request is risky for the carrier. The federal rule on lost electronically stored information, Rule 37(e), allows a court to order measures no greater than necessary to cure the prejudice when ESI is lost because a party failed to take reasonable steps. Only intent to deprive permits harsher remedies such as an unfavorable presumption, a jury instruction, dismissal or default judgment.

Two 2026 federal cases show how it plays out:

  • In Sandoval v. Dustar Express, the court recommended an adverse-inference instruction after finding that the carrier did not take reasonable and affirmative steps to preserve evidence and acted willfully with intent to destroy discoverable data.
  • In Chappell v. SRT Express, the court ordered a rebuttable adverse inference instruction as a curative measure after the loss of critical truck data.

These are federal decisions, and the outcome in any case depends on its facts, the court and the governing state rules. They do show why a documented request matters: it helps establish what the carrier knew and when.

Limits of a preservation letter

The letter is a tool, not a guarantee. It does not create the duty to preserve, and it does not narrow it. The same practitioner guide notes that a letter neither creates nor constrains the duty, and that if an opponent may destroy evidence, a lawyer should consider seeking a temporary restraining order.

In practice, that means:

  • A letter may not stop a carrier from repairing or returning a damaged truck to service. If the physical vehicle is at risk, a court order may be the safer path.
  • A carrier can respond with a letter of its own, arguing that parts of your request are too broad. This is another reason to keep the demand reasonable and specific.
  • A letter cannot restore data that was already overwritten before it was sent. Speed is the only protection against that.

Our perspective

In truck cases, the first weeks decide a great deal. By the time many injured people call a lawyer, the carrier has already begun its own investigation, and its insurer may have a team at the scene or soon after. We do not believe the injured person should be the last to secure the evidence.

At Calil Law, we are led by a Board Certified Civil Trial Lawyer with over 18 years of Florida experience. We think about a preservation letter the way a trial lawyer does: not as a form, but as the first exhibit in a story we may one day tell a jury. That means asking early what the jury will need to see, then naming the exact systems, files and people that hold it.

We also believe in direct access. You should know who is handling your case and be able to reach them. When a family is dealing with injuries, medical bills and an insurance company that wants a statement, they need someone who acts quickly and explains each step plainly.

Your life has value, and so does the evidence that proves what happened to you.

Jorge

How Calil Law can help

If a commercial truck injured you or someone you love in Florida, speak with us early. We handle truck accident claims on a contingency fee basis: no upfront fees, and we are paid only if you receive a settlement or award. We review each case personally, and we can move to put the trucking company and its insurer on written notice to preserve evidence.

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To understand why representation matters in these claims, read our article on why truck accident cases tend to pay more with a lawyer. If you are ready to talk, contact us for a free consultation.

FAQ

Is a preservation letter the same as a spoliation letter?

In trucking practice, yes: the terms are used interchangeably, along with litigation hold letter. All describe a written notice asking the recipient to keep evidence connected to an anticipated claim. “Spoliation” refers to the loss or destruction of evidence, which is the harm the letter is meant to prevent.

Can I send a preservation letter myself?

You can, and nothing in the federal rules requires a lawyer to send one. But a letter that names the right systems, goes to every party holding data, and is built to be read by a court later is hard to draft without experience. Most injured people are better served by having an attorney send it quickly.

How soon should the letter go out after a truck accident?

As soon as possible, ideally within days. Engine data can be overwritten by later driving, and federal rules require carriers to keep some records for only three to six months. The sooner the notice, the less room there is for routine deletion.

What if the trucking company does not respond?

Silence does not remove the duty to preserve, and it does not help the company if evidence later disappears. Your attorney can follow up, document the non-response, and, if the evidence is at real risk, ask a court for an order. If evidence is lost, a court may impose sanctions.

Does the letter cost anything?

At Calil Law, we do not charge upfront fees. We work on a contingency fee basis, so our fee comes from a settlement or court award, and the work of protecting evidence is part of building your case.

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