An evidence preservation letter is a formal written notice sent to an opposing party or another person or organization that may possess important evidence. It identifies materials that may be relevant to a potential claim and asks the recipient to preserve them rather than allowing them to be destroyed, altered, overwritten, or discarded. Depending on the circumstances and applicable law, the recipient may already have a legal duty to preserve relevant evidence once litigation is reasonably anticipated.

In personal injury cases, the letter puts the recipient on notice that litigation is anticipated and tells them exactly what to hold: security footage, event data recorder downloads, maintenance logs, electronic communications. It also documents what the recipient knew and when they knew it. If evidence disappears afterward, that record becomes the basis for asking a court to impose spoliation sanctions, which can range from paying your legal fees to an adverse inference instruction telling the jury the missing evidence would have hurt the defendant.

After a crash or a fall, physical and digital evidence disappears fast. Security systems overwrite footage on a loop, often within days. Companies repair damaged equipment before anyone inspects it. A preservation letter interrupts that routine destruction while the facts still exist.

One point matters more than most articles admit: the letter does not create the duty to preserve. Courts have held for decades that the duty attaches once a party reasonably anticipates litigation, whether or not anyone sends a letter. What the letter can do is provide strong evidence that the recipient was placed on notice of a potential claim and of the specific evidence believed to be relevant. If that evidence is later lost, the letter may become important when a court evaluates when a preservation duty arose and whether reasonable preservation steps were taken.

What Is an Evidence Preservation Letter?

An evidence preservation letter, sometimes called a spoliation letter or a litigation hold letter, is a written notice or preservation request sent by an injured party or their attorney to anyone who might possess evidence related to an accident. It identifies the incident by date, time, and location. It then lists, item by item, what the recipient must keep.

The letter also demands that the recipient suspend routine document destruction. Many companies run automated systems that purge emails or overwrite video on a fixed cycle, sometimes 14 days, sometimes 30. The influential federal decision in Zubulake v. UBS Warburg, for example, explained that a party anticipating litigation may need to suspend routine document-destruction practices and implement a litigation hold for relevant materials. State-law preservation standards can vary.

Its most valuable function is evidentiary. A dated letter with documented delivery establishes that the recipient knew a claim was coming and knew which items mattered. When evidence vanishes after that, the defendant's explanation that it was routine housekeeping becomes much harder to sell.

A preservation letter is not the same as a subpoena or court order. The letter itself generally serves as notice and identifies evidence that should be retained. A legal duty to preserve may already exist when litigation is reasonably foreseeable, while subpoenas and court orders can provide separate mechanisms for compelling the production or protection of evidence. The rules can also differ depending on whether the recipient is a potential defendant or an unrelated third party.

How Preservation Letters Help Prove Liability

Eyewitness memories can fade or change over time, while properly preserved video and electronic records can provide a more objective record of what occurred. A preservation letter locks that proof in place before anyone has a reason to lose it.

Commercial trucking cases show why this matters. The carrier controls the driver's hours-of-service logs, the maintenance history, and the electronic control module data. Absent a preservation demand, the company may repair the tractor and cycle the data before a plaintiff ever asks. Federal regulations require motor carriers to keep these records for at least six months. But if a crash or claim makes a lawsuit reasonably likely, the carrier may have to keep relevant records longer rather than destroying them when that six-month period ends.

The same dynamic runs through premises cases. When a store argues a customer simply lost their footing, preserved security video may show whether a hazardous condition existed, how long it was present, and what happened before and during the incident. Locking down the record early narrows the defense to what actually happened.

The Evidence Worth Preserving Varies by Case Type

What you demand depends on the accident. A letter after a truck collision looks nothing like one after a slip and fall. The demand has to be specific enough to give real notice, but broad enough to capture everything relevant. Because the right list varies across different types of personal injury cases, a generic template tends to miss the item that decides the case.

Frequently requested categories include:

• Surveillance and security camera footage from stores, parking lots, or traffic cameras.
• Dashcam and body camera recordings from commercial vehicles and responding officers.
• Electronic logging device and telematics data from commercial trucks.
• Event data recorder downloads from passenger vehicles.
• Maintenance, repair, and inspection records for vehicles or property.
• Relevant employee training, safety, incident, and personnel records when they bear on the claim.
• Cell phone usage records showing calls, texts, or other activity around the time of a crash.
• The physical object, equipment, or vehicle involved.
• Internal emails, text messages, and communications about the hazard.

Electronically stored information draws the most attention in modern cases, because it is both the most probative and the easiest to lose. Courts expect parties to take reasonable steps to preserve it once litigation is foreseeable.

When Should a Preservation Letter Be Sent?

As soon as reasonably possible. Digital evidence operates on a clock nobody controls. Commercial security systems commonly overwrite footage within a week, and once a segment is gone, it's gone. A letter sent a month later arrives after the only recording of your accident has been recycled.

Speed also protects the physical scene. If a defective machine injures a worker, the employer may repair or scrap it within days. A prompt preservation notice can put the responsible parties on notice that the machine itself may be important evidence and should not be altered, repaired, or discarded without appropriate documentation or inspection.

None of this depends on you being out of the hospital. An attorney can identify custodians and send letters while you are still in treatment. Acting early can also make it much harder for a party to argue later that it had no reason to anticipate a claim, which is the argument that defeats sanctions motions.

What Happens if Evidence Is Destroyed?

Destruction, alteration, or loss of relevant evidence is called spoliation, and the consequences depend heavily on the forum and on the defendant's state of mind. This is where a lot of published summaries get it wrong.

In federal court, Rule 37(e) governs lost electronically stored information, and it draws a hard line. If ESI that should have been preserved is lost because a party failed to take reasonable steps, and it cannot be restored through other discovery, then under Rule 37(e)(1) a court may order measures no greater than necessary to cure the prejudice. That is the negligence lane, and the remedies there are corrective, not punitive.

The severe sanctions live in Rule 37(e)(2), and they are available only on a finding that the party acted with the intent to deprive the other side of the information's use in the litigation. Only then may a court presume the lost information was unfavorable, instruct the jury it may or must so presume, dismiss the action, or enter default judgment. The 2015 amendment adopted this standard specifically to reject the older rule permitting adverse inference instructions on a showing of negligence or gross negligence.

Rule 37(e) applies specifically to electronically stored information. Destruction of physical evidence, such as a vehicle component or defective product, may be analyzed under different federal or state-law spoliation principles.

Negligent loss of ESI may support measures designed to cure demonstrated prejudice, while the severe sanctions listed in Rule 37(e)(2) require intent to deprive. An adverse inference or a default judgment requires intent. That is a substantially higher bar than most descriptions of spoliation suggest, and it is why the preservation letter matters so much. A documented, specific preservation letter can be important evidence that the recipient knew particular information might be relevant. Whether later destruction was negligent, reckless, or intentional still depends on the surrounding facts.

Outside federal court, the rules diverge:

• State sanctions are the norm. Most states address spoliation through evidentiary sanctions in the underlying case, and the required culpability varies by jurisdiction.
• The independent tort is the exception, not the rule. A relatively small number of jurisdictions recognize an independent tort related to spoliation, and the elements and circumstances in which such a claim is available vary substantially. California was an early jurisdiction to recognize an independent spoliation tort through an intermediate appellate decision, but the California Supreme Court later rejected independent intentional-spoliation claims against both parties and third parties.
• Culpability standards differ. Some states require bad faith or willfulness for severe sanctions; others permit sanctions on a lesser showing.

The upshot is that whether destruction of evidence helps your case depends on where the case is filed and what can be proven about the defendant's state of mind. It is not automatic anywhere.

Frequently Asked Questions

Can anyone send an evidence preservation letter?

Yes. An injured person can send a written preservation request without an attorney. However, an attorney may be better positioned to identify the types of evidence that could matter, determine who actually controls it, tailor the request to the potential claims, document delivery, and use subpoenas or other legal procedures when voluntary preservation is not enough.

Does a preservation letter guarantee the evidence will be kept?

No. Nothing physically prevents someone from deleting a file or shredding a document. The letter can affect how a later loss of evidence is evaluated because it may establish that the recipient had specific notice of the potential claim and the evidence being requested. Without notice, a defendant argues the loss was routine. With a dated, specific letter in the record, that argument gets much harder, and in federal court proving intent is what unlocks the severe sanctions under Rule 37(e)(2).

Who receives the evidence preservation letter?

Anyone with control over relevant evidence. That commonly means the at-fault driver, a property owner, a store manager, or a trucking company. Letters frequently go to third parties who are not defendants at all. A gas station across the street may hold the only footage of the collision, and it has no reason to keep it unless somebody asks.

A preservation request to a third party can be especially important because the third party may otherwise have no reason to retain the material. However, a preservation letter is not the same as a subpoena or court order, and whether a nonparty has an independent legal duty to preserve evidence depends on the circumstances and applicable state law.

How long do parties have to preserve evidence?

How long evidence must be preserved depends on the circumstances. In general, a preservation duty continues while litigation is pending or reasonably anticipated and for as long as the evidence remains relevant to that dispute. The appropriate end point can depend on factors such as settlement, final resolution of the case, possible appeals, related claims, and applicable retention requirements. Preservation obligations should also be reassessed as the issues in a case change.

Call Brandon J. Broderick For Legal Help

Evidence in an injury case has a shelf life, and the party holding it usually has no incentive to extend it. Footage gets overwritten. Trucks go back into service. Data gets cycled. By the time most people call a lawyer, some of it is already gone.

At Brandon J. Broderick, Attorney at Law, our team moves quickly to identify who holds what and to put them on notice in writing before the clock runs out. We draft preservation demands that are specific enough to matter, document delivery, and when relevant evidence is lost after a preservation duty arose, we can evaluate available legal remedies, including whether spoliation sanctions may be appropriate. Reach out today for a free consultation.