Legal Injury GuideLast reviewed & updated: 2026
Spoliation of Evidence — Why
Preserving Proof Wins Injury Cases
Injury cases are won and lost on evidence — and evidence disappears fast. Surveillance footage is overwritten, damaged vehicles are scrapped, and hazards are cleaned up within days. When a party who should have preserved that proof destroys or loses it, the law calls it spoliation, and courts can punish it severely. This guide explains what spoliation is, how a preservation letter protects your case, and the practical steps every injury victim should take to lock in the evidence early.
~30 days
Footage often overwritten in
Preservation letter
Key tool
Adverse inference
Common sanction
Both sides
Applies to
Evidence That Vanishes Fastest
The most valuable evidence is often the most perishable. Recognizing what disappears quickly tells you where to focus your preservation efforts in the crucial first days after an injury.
Vehicle and black-box data
Event data recorders, dashcams, and the vehicles themselves can be repaired or scrapped within days if not preserved.
Surveillance footage
Store and traffic cameras often overwrite footage within 30 days, making a fast preservation request critical.
Physical scene conditions
Spills, defects, and hazards are cleaned up or repaired quickly; photographs lock in their condition.
Electronic records
Maintenance logs, text messages, and inspection records can be deleted unless a litigation hold is issued.
Sanctions for Destroyed Evidence
When a party fails to preserve relevant evidence, courts have a spectrum of remedies. The most common is the adverse inference instruction, which allows the jury to assume the lost evidence would have hurt the party responsible for losing it. More serious misconduct can lead to excluded evidence, stricken claims or defenses, or even dismissal or default. The remedy generally scales with the party’s culpability and the harm the loss caused to the other side. For the injured person, the threat of these sanctions is a powerful lever — but only if a duty to preserve was created early through proper notice.
What Helps and What Hurts
Preserving evidence is largely about speed and discipline — and about not sabotaging your own case.
▲Protects Your Case
+Sending a preservation letter early
A written demand to preserve evidence puts the other side on notice and supports sanctions if they destroy it.
+Photographing everything immediately
Time-stamped photos and video capture conditions before they change or are repaired.
+Identifying third-party footage fast
Requesting nearby camera footage before it is overwritten preserves powerful proof.
▼Endangers Your Case
–Deleting your own social media or records
Removing your own posts or data after a claim can itself be treated as spoliation against you.
–Waiting to act
Delay allows routine destruction of footage, repair of vehicles, and cleanup of hazards.
–Failing to secure the damaged product
In defective-product cases, discarding the item that caused the injury can gut the claim.
Your Evidence Preservation Plan
Act within the first days: photograph the scene and your injuries, identify nearby cameras, keep any product or vehicle involved, and avoid deleting your own records or posts. Sending a preservation letter promptly is often the single most valuable early step, and it pairs naturally with an injury checklist to make sure nothing is missed. Strong preserved evidence also improves your position in negotiation and, if needed, in a lawsuit.
Frequently Asked Questions
What is spoliation of evidence?
Spoliation is the destruction, loss, or material alteration of evidence that is relevant to a legal claim, or the failure to preserve such evidence when litigation is reasonably foreseeable. It can be intentional or negligent. Because injury cases often rise or fall on physical proof — vehicle data, video footage, a defective product — spoliation can dramatically affect the outcome, and courts have tools to penalize the party responsible for it.
What is a spoliation or preservation letter?
A preservation (spoliation) letter is a written notice sent to a party — often the at-fault company, driver, or insurer — demanding that they preserve specific evidence relevant to the claim, such as vehicle data, surveillance footage, or maintenance records. Sending it early creates a documented duty to preserve. If the recipient then destroys the evidence, the letter helps establish that the destruction was improper and supports a request for sanctions.
What happens if a party destroys evidence?
Courts can impose a range of sanctions for spoliation. A common one is an adverse inference instruction, which tells the jury it may assume the destroyed evidence would have been unfavorable to the party that lost it. More severe sanctions can include excluding testimony, striking claims or defenses, or in extreme cases dismissing a claim or entering a default. The severity usually depends on how culpable the conduct was and how much it prejudiced the other side.
Can spoliation hurt the injured person too?
Yes. Spoliation rules apply to both sides. An injury victim who deletes relevant social media posts, discards a defective product, or fails to preserve their own damaged vehicle can face the same sanctions, including an adverse inference. This is why victims should avoid deleting anything potentially relevant once a claim is anticipated and should preserve the product or vehicle involved in the injury.
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For informational purposes only. Not legal advice. Consult a licensed attorney.