How Evidence Preservation Letters Protect Your Case

⚖️ What an Evidence Preservation Letter Does

A preservation letter can identify categories of information that may become relevant in discovery and request that the recipient take reasonable steps to prevent their loss.

Creates Written Notice

A dated written notice can document that specific evidence was identified as potentially relevant. Whether and when a legal preservation duty exists remains a separate legal question.

Identifies Relevant Sources

The notice may identify documents, electronic systems, photographs, maintenance records, personnel files, product information or other evidence connected to the anticipated dispute.

Addresses Routine Destruction

Businesses may have ordinary document-retention schedules, automatic email deletion or data-overwriting systems. When preservation duties apply, reasonable steps may require intervention in routine systems to prevent loss of relevant information.

It Is Not a Discovery Request

Preserving information and producing information are different concepts. A preservation notice asks that evidence not be lost; formal discovery procedures determine what must later be disclosed or produced.

⏱️ When Preservation Becomes Important

Preservation issues can arise before a lawsuit is filed. Federal Rule of Civil Procedure 37(e) addresses electronically stored information that should have been preserved in the anticipation or conduct of litigation.

Reasonably Anticipated Litigation

The 2015 advisory committee notes to Rule 37 explain that many decisions recognize a preservation duty when litigation is reasonably foreseeable. The rule itself does not create that underlying duty.

Timing Is Fact-Specific

There is no universal event that triggers preservation in every dispute. Courts may consider what the party knew, when litigation became likely and whether the information was expected to be relevant.

Early Action Can Matter

Older records may be subject to routine destruction, facility closure, corporate changes or system migration. Identifying important evidence sources early can reduce avoidable loss.

📂 Evidence That May Need Preservation

Preserve Source Information

Keeping information about where a record came from, who maintained it and whether it is an original or copy can later assist with authentication and context.

Do Not Alter Original Evidence

Potential evidence should generally be preserved in its existing form rather than edited, annotated or reorganized in a way that changes the original.

Copies Can Be Useful, but Originals May Matter

Scanned copies can help prevent informational loss, but physical originals, native electronic files and metadata may contain information not visible in a simple printout.

🏭 Why Preservation Matters in Asbestos Cases

Mesothelioma litigation can depend on reconstructing exposure from historical evidence. Records that appear routine today may later help establish where a person worked, what products were present or which company supplied or maintained equipment.

Decades-Old Exposure

Employment and asbestos-product evidence may date back many years. Relevant businesses may have merged, closed or transferred records.

Product Identification

Invoices, catalogs and purchase records may help investigate product presence, but preservation does not make those records conclusive proof of claimant exposure.

Worksite Reconstruction

Blueprints, maintenance records, photographs and contractor documents may help establish where equipment was located and what activities occurred during relevant periods.

Witness Evidence

Preservation can also include identifying and retaining existing statements or recordings. A preservation letter itself cannot preserve a witness’s memory, so timely interviews and properly documented testimony may also matter.

See How to Document Your Asbestos Exposure History.

💻 Electronic Records & Rule 37(e)

Federal Rule 37(e) specifically addresses loss of electronically stored information, often called ESI.

Four Important Questions

Rule 37(e) becomes relevant when ESI should have been preserved in anticipation or conduct of litigation, is lost because reasonable preservation steps were not taken, and cannot be restored or replaced through additional discovery.

Reasonable Steps—Not Perfect Preservation

The advisory committee notes emphasize reasonable preservation rather than perfection. What is reasonable can depend on the circumstances, resources, information systems and importance of the evidence.

Automatic Deletion

Once preservation duties apply, allowing routine systems to continue deleting relevant information can create problems. Reasonable steps may include suspending applicable auto-delete or overwrite functions for relevant custodians and data sources.

Restoration or Replacement Matters

If lost ESI can be restored or replaced through additional discovery, Rule 37(e)’s loss remedies do not proceed in the same way as when the information is irretrievable.

🎯 Making Preservation Requests Specific

A preservation notice is more useful when it identifies the dispute and evidence categories with enough detail for the recipient to understand what information may be relevant.

Identify Relevant People

Names, departments, job titles or other custodians can help locate records without demanding preservation of every file held by an organization.

Identify Relevant Time Periods

Dates tied to employment, product use, construction, maintenance or exposure can help define a reasonable preservation scope.

Identify Systems and Record Types

A notice may identify email, shared drives, databases, maintenance systems, paper archives, photographs or physical records when relevant.

Avoid Assuming Facts Not Yet Proven

The letter can identify suspected evidence without stating uncertain product identity, exposure or responsibility as established fact.

Proportionality Still Matters

Preservation should be tailored to the anticipated litigation. The Rule 37 advisory notes recognize that proportionality and party resources can be relevant to evaluating reasonable preservation efforts.

🛡️ What Happens After a Preservation Letter

Receiving a preservation letter can prompt an organization or individual to identify relevant information sources and consider steps needed to protect them.

Litigation Hold

Organizations may issue internal litigation-hold instructions to people responsible for potentially relevant records and systems.

Identify Custodians

Relevant employees, former employees, departments, contractors or information-technology personnel may need to be identified.

Protect Data Sources

Reasonable measures can include preserving email, shared-drive folders, databases, mobile-device information or backups when those sources contain relevant information and preservation is warranted.

Document Preservation Steps

Keeping a record of preservation actions can later help explain what was protected, when action was taken and how the process was implemented.

Production Comes Later

During discovery, parties may use requests for production, subpoenas and other authorized procedures to seek preserved evidence. A preservation letter does not automatically require immediate production of every identified item.

See How Discovery Works in Mesothelioma Cases.

⚠️ What If Evidence Is Lost?

The legal consequences of lost evidence depend on the type of evidence, why it was lost, the applicable law and whether the loss prejudiced another party.

Rule 37(e) and Lost ESI

For electronically stored information covered by federal Rule 37(e), a court that finds prejudice may order measures no greater than necessary to cure that prejudice when the rule’s requirements are met.

More Severe Measures Require Intent

Under Rule 37(e)(2), specified severe measures—such as an adverse presumption, certain adverse jury instructions, dismissal or default judgment—require a finding that the party acted with intent to deprive another party of the information’s use in the litigation.

Not Every Lost Record Leads to Sanctions

Loss alone does not establish the requirements for sanctions. Courts examine preservation duty, reasonable steps, whether the information can be restored or replaced, prejudice and, for the most severe Rule 37(e) measures, intent.

Non-Electronic Evidence Can Involve Different Law

Rule 37(e) is directed specifically at ESI. Preservation disputes involving physical or paper evidence may be governed by other rules, court authority or state law depending on the case.

❓ Frequently Asked Questions

What is an evidence preservation letter?

It is written notice identifying potentially relevant evidence and requesting that reasonable steps be taken to prevent its loss or destruction.

Is a preservation letter the same as a subpoena?

No. A preservation notice and a subpoena serve different functions. A subpoena can compel specified testimony or production when validly issued and served under applicable law.

Does a preservation letter automatically create a legal duty?

Not necessarily. Whether a preservation duty exists depends on governing law and the circumstances, including whether litigation is pending or reasonably anticipated.

Can a letter cover electronic evidence?

Yes. Relevant email, databases, shared drives and other ESI may be identified for preservation.

Should every company record be preserved?

Preservation is generally better focused on information reasonably connected to anticipated claims and defenses rather than indiscriminately preserving every record.

What is a litigation hold?

It is a process used to instruct appropriate people and systems to preserve potentially relevant information when a preservation obligation applies.

Can old asbestos product records be preserved?

Yes, when they still exist and are potentially relevant. Their evidentiary significance depends on authenticity, context and connection to the claimant’s exposure history.

What happens if electronic evidence is accidentally lost?

Rule 37(e) requires more than the fact of loss. The court examines whether the information should have been preserved, whether reasonable steps were taken and whether it can be restored or replaced.

Does a preservation letter prove asbestos exposure?

No. It protects potentially relevant evidence; it does not establish exposure, causation or liability.

When should preservation be considered?

Preservation issues should be evaluated promptly when litigation is pending or reasonably anticipated because relevant records may otherwise be lost through routine processes.

📞 Request a Case Evaluation

Historical asbestos claims can depend on records that become harder to locate over time. Preserving employment files, product records, photographs, electronic information, witness information and medical documentation early can help protect the factual record.

Call 800.291.0963 for a no-obligation case evaluation and to talk to a real person 24/7, 365 days a year. Many mesothelioma law firms handle qualifying cases on a contingency-fee basis; confirm the terms with the firm you retain. Submit your case here.