A truck can be repaired before anyone on the injured person’s side examines it. A camera may overwrite the crash footage while the insurer is still gathering statements. A preservation letter identifies the evidence that needs to survive long enough for a fair investigation and asks the people who control it to stop routine deletion or disposal.
The letter should fit the collision. A brake-failure claim calls for different physical evidence from a dispute about a driver’s hours. Sending a broad demand is only the beginning: someone must identify the custodians, confirm what was retained, and arrange the next step if evidence remains at risk.
What a preservation letter accomplishes
A preservation letter gives written notice of anticipated litigation and describes relevant records, electronic information, and physical items. It can help establish what the recipient knew and when. It does not itself compel production, authorize entry onto private property, or function as a court order.
For a Louisiana truck collision, the request usually starts with the motor carrier and other identified evidence holders. Depending on the facts, a driver, equipment owner, maintenance contractor, camera provider, towing company, or nearby business may control something important. Naming the carrier alone may miss video stored elsewhere or a trailer already moved to another facility.
Our Baton Rouge truck accident practice examines those ownership and custody questions when planning preservation. The practical goal is an identifiable, usable record of the event, including evidence that may contradict the initial account.
Retention periods do not answer every preservation question
Federal trucking regulations set minimum retention requirements for particular records when the rules apply. Those periods are not a universal deadline for sending a letter, nor permission to destroy relevant evidence despite a litigation-preservation obligation. Vendor settings may also cause other information to disappear much sooner.
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| Evidence | Relevant rule or practical limit | What to identify |
|---|---|---|
| Driver duty-status records and supporting documents | 49 CFR 395.8(k) generally requires six months from receipt for records covered by the rule. | The relevant dates, original entries, changes, supporting records, and available exports. |
| Accident register and required accident reports | Section 390.15 requires a register for three years after qualifying accidents, along with specified required reports. | Whether the event meets the regulatory definition and which reports were required. |
| Driver qualification file | Section 391.51 generally requires retention while employed and for three years afterward; certain listed records have separate three-year limits. | The actual employment period, relevant file components, and records of earlier concerns. |
| Maintenance and inspection records | For vehicles subject to its recordkeeping requirements, including the 30-consecutive-day control condition, section 396.3 requires one year of retention and six months after the vehicle leaves the carrier’s control. | The tractor and trailer separately, reported defects, work performed, and control dates. |
| Drug and alcohol testing records | Section 382.401 uses different periods for different record categories, including one, two, and five years. | The test category, result, collection documentation, and any required explanation for a missed test. |
| Engine or event-recorder data | Available data and overwrite behavior depend on the equipment and system. No single period in the rules above covers every device. | Module identity, recorded events, intervening use, and a qualified extraction method. |
| Dashcam, cab, yard, or nearby business video | Storage and automatic overwrite depend on the system. | All relevant cameras, the surrounding time interval, original files, and associated timestamps. |
| Dispatch, GPS, and telematics information | Retention and export options vary by service and record type. | Carrier and vendor accounts, messages, location information, and available audit history. |
| Truck, trailer, tires, brakes, and removed components | Repair, salvage, transfer, or disposal can change the evidence. | Current location, proposed work, inspection arrangements, and custody of removed parts. |
An ELD log does not independently establish how much a driver slept. The article on what ELD records can show about fatigue explains why supporting records and the limits of the data matter. Similarly, a driver file is useful only if its contents bear on an issue in the case; our discussion of negligent hiring and retention connects prior information with carrier knowledge and crash causation.
Post-accident testing is not required after every collision. Section 382.303 distinguishes fatal accidents from specified injury or tow-away accidents involving a timely traffic citation, and contains exceptions. It also requires explanations for certain delayed or missed tests. Preserve the decision and timing records rather than assuming that the absence of a result proves a violation.
Make the request specific enough to carry out
Identify the crash date, approximate time, location, parties, and vehicles as accurately as the available information permits. Unit numbers, VINs, trailer numbers, and the carrier’s DOT number can help distinguish the equipment. Label estimates and unknowns instead of supplying guessed identifiers.
Then connect each requested category to the event. For video, identify a reasonable interval before and after the collision, not just the instant of impact. For electronic records, request preservation of original files and associated metadata, edits, and audit information where relevant. A printed summary may omit information needed to understand the underlying record.
Ask the recipient to suspend relevant overwrite or disposal processes and notify vendors or other custodians within its control. Request written confirmation of the preservation steps and identification of information that no longer exists. Keep the letter, delivery evidence, responses, and follow-up communications.
Physical inspections need coordination. Identify impending repairs, salvage, or movement and propose a reasonable inspection process. Necessary safety measures should not be delayed by an unsafe attempt to preserve a scene. Qualified professionals can address documentation, storage, removed parts, and testing methods; do not dismantle the truck or take equipment yourself.
A workable letter therefore has five parts: identification of the collision; notice of the anticipated claim; specific evidence and time periods; requested preservation and inspection arrangements; and a request for confirmation. That structure is a starting point for a tailored request, not a substitute for assessing custody, relevance, safety, and applicable procedure.
Lost evidence: Louisiana and federal rules differ
In Reynolds v. Bordelon, decided June 30, 2015, the Louisiana Supreme Court declined to recognize an independent tort for negligent spoliation of evidence. The decision does not mean evidence loss has no consequences. It discusses other possible protections and remedies, including evidentiary measures, discovery rules, and contractual obligations. The result depends on the conduct and legal basis at issue.
Louisiana Code of Civil Procedure article 1471 addresses failure to obey an order permitting or compelling discovery. Available orders and expense awards depend on the circumstances. The article also contains a qualification for electronically stored information lost through routine, good-faith system operation, absent exceptional circumstances. Sending a letter does not automatically establish a violation of this article.
In federal litigation, Rule 37(e) addresses electronically stored information that should have been preserved for anticipated or ongoing litigation, was lost because reasonable steps were not taken, and cannot be restored or replaced through additional discovery. A finding of prejudice can support measures limited to curing it. The rule requires intent to deprive another party of the information’s use before the court may impose the specified adverse presumptions, jury instructions, dismissal, or default.
That federal rule concerns electronic information. Physical evidence requires the applicable separate analysis. In either setting, a missing item does not automatically prove what it would have shown or decide responsibility for the crash.
Follow up while the evidence can still be preserved
If a carrier says video was overwritten, establish which system held it, the retention setting, when it was lost, when notice arrived, and whether another copy exists. A vendor export, recipient copy, or different camera may answer part of the question. Avoid accusing someone of deliberate destruction before those facts are known.
Preservation also applies to your own relevant information. Keep original photographs, messages, recordings, and damaged property where reasonably possible. Tell counsel about repairs, device replacement, or automatic deletion before information disappears. Preserve unfavorable material as well as helpful evidence.
A preservation request does not file a lawsuit or suspend a filing deadline. If the equipment is about to be altered or a recipient will not preserve it, counsel should assess promptly whether formal discovery, an agreed inspection, or court relief is available. The next step depends on the actual risk and procedural setting, not simply on whether a letter was sent.
Sources checked: September 29, 2026. Last reviewed: September 28, 2026.