Secondary Evidence, and Its Rules
Systems prefer originals and accept substitutes on conditions. Understanding those conditions, and the order in which they have to be satisfied, is what separates a successful secondary evidence application from a refused one.
The rule in short
Secondary evidence is proof of a document's contents offered where the document itself cannot be produced. Most systems require the party to establish that the original is genuinely unavailable and that the unavailability was not their own fault. Once admitted, secondary evidence is weighed like anything else, and its quality varies enormously between a certified copy and a recollection.
The preference for originals exists because copies can be altered and recollections drift. Where an original genuinely cannot be produced, the preference gives way, and the conditions attached to that are the substance of this subject.
The preference for originals
It applies to contents. The rule concerns proving what a document says, and it does not require an original for facts that happen to be documented somewhere.
Copies are ordinarily acceptable. Most systems now treat accurate reproductions as equivalent unless a genuine question about authenticity arises.
The preference bites where it matters. Where the terms of a document are the issue, or where alteration is alleged, the original becomes important again.
Some questions need the original. Signature examination, pressure marks and physical alteration cannot be assessed from a reproduction, per the difference between an original and a copy.
It is not a rule about importance. The preference applies to trivial documents and significant ones alike, and it concerns method rather than the gravity of the point.
It does not bar other evidence of the fact. Where a fact happens to be documented, it can still be proved by anybody who witnessed it, and the rule reaches only proof of the document itself.
Practice varies by forum. How strictly the preference is enforced differs considerably between systems, and the local position is worth knowing well in advance.
It applies to recordings and data too. Modern formulations cover photographs, recordings and stored data, so the same reasoning reaches material that is not paper at all.
Establishing unavailability
The threshold question. Secondary evidence is generally admitted only once the party shows the original cannot be produced, and that showing is itself evidence.
Loss or destruction. Evidence that the document was lost or destroyed, and the circumstances, is the commonest basis and needs stating specifically.
A diligent search. Where a document is merely missing, evidence of a thorough search establishes unavailability, and a cursory one does not.
In another party's control. Where the opponent holds the original, notice to produce is usually required before secondary evidence is offered.
Beyond reach. Documents held abroad or by somebody who cannot be compelled fall into their own category with their own treatment.
Fault matters. Where the party seeking to rely on secondary evidence destroyed the original themselves, the route may be closed, per spoliation and missing evidence.
A formal declaration may be needed. Some systems require a sworn statement of loss, per affidavits of lost documents.
| Substitute | Typical weight | Condition |
|---|---|---|
| Certified copy | Very high | Issued by the holder |
| Contemporaneous duplicate | High | Made at the time |
| Ordinary photocopy | Good | Provenance explained |
| Draft version | Moderate | Terms may have changed |
| Testimony about contents | Low | Only where nothing better exists |
Kinds of secondary evidence
Certified copies. Issued by the authority holding the original, these are the strongest substitute and are frequently treated as equivalent.
Ordinary copies. Photocopies and scans made by anybody, which establish contents where nothing turns on the physical document.
Counterparts and duplicates. A second executed version or a copy sent to another party at the time, which is contemporaneous rather than derived.
Drafts and earlier versions. These establish what a document probably said and carry the risk that terms changed before execution.
Testimony about contents. Somebody who read the document describing what it said, which is the weakest form and is sometimes all that remains.
Documents referring to it. Correspondence quoting or summarizing the original, created for other purposes at the time and useful precisely for that reason.
Public record copies. Where the lost document was an official record, systems generally provide a specific route for proving its contents by a certified copy or an official statement.
Applications fail on sequence more often than on substance. A party who leads with the substitute, and addresses why the original is missing only when asked, has already told the reader that the absence was an afterthought rather than a documented fact.
Weight after admission
Admission is not acceptance. Getting secondary evidence in is a threshold question, and how much it establishes is decided separately.
Quality varies enormously. A certified copy and a witness recollection are both secondary evidence and are not remotely equivalent in weight.
Corroboration matters more. Where the substitute is weak, independent support for the same contents becomes correspondingly important.
The circumstances of loss bear on weight. A document lost in a documented fire is treated differently from one that simply cannot be found.
An opponent may still dispute contents. Secondary evidence establishes what the original said only to the extent the decision-maker accepts it.
The opponent may hold a copy. Where both sides once had the document, the other party may be able to produce what has been lost, and asking is cheaper than reconstructing.
Consistency with the surrounding facts. Contents that fit everything else known are easier to accept than ones that do not, per the chain of small facts.
Using the route properly
Deal with unavailability first. The application should establish why the original cannot be produced before it offers anything in its place.
Evidence the search. What was looked for, where, by whom and when converts an assertion of loss into a documented one.
Offer the best available substitute. Where both a certified copy and a recollection exist, leading with the weaker one invites an unnecessary question.
Explain the chain. How the copy came into existence and into the party's hands is part of what makes it acceptable.
Give notice where required. Where the original is with the other side, the procedural step of requesting it usually has to happen first.
Do not overstate. A recollection of contents remains a recollection, and presenting it as though it were equivalent to the document damages the application.
Anticipate the dispute about contents. Admission settles whether the substitute is heard, and an opponent remains free to argue that the original said something different.
The preference for originals exists because copies can be altered and memories drift, and it gives way where an original genuinely cannot be produced.
The condition attached is that unavailability has to be established first, with evidence of loss, destruction or a diligent search, and fault on the part of the proponent can close the route entirely.
Secondary evidence is a wide category covering everything from a certified copy to a witness recollection, and the difference in weight between the ends of that range is very large.
Admission and persuasion are separate questions. Getting a substitute received establishes nothing about how much a decision-maker will accept from it.
The applications that succeed deal with unavailability first, evidence the search properly, offer the best substitute available, explain how it came to exist, and claim no more for it than it can bear.
Points to carry away
- The original is preferred, and substitutes need a reason.
- Unavailability generally has to be proved first.
- Fault on the part of the proponent can bar the route.
- Not all secondary evidence is equal in weight.
- Admission is a separate question from persuasiveness.
Questions readers ask
What has to be shown before secondary evidence is admitted?
Usually that the original cannot be produced, and that its absence is not the fault of the party seeking to rely on the substitute. Where a document was lost or destroyed, evidence of the circumstances is needed. Where it is merely missing, evidence of a diligent search establishes unavailability, and a search described in general terms rarely satisfies that. Where the original is held by the opponent, most systems require a formal request for production before secondary evidence may be offered in its place.
Are all copies treated the same?
No, and the range is wide. A copy certified by the authority holding the original is frequently treated as equivalent to the document itself. A contemporaneous duplicate made at the time, such as a counterpart sent to another party, is close behind. An ordinary photocopy of unknown provenance is weaker, a draft version weaker still because terms may have changed before execution, and testimony from somebody who read the document is the weakest form of all. Leading with the strongest available substitute matters.
Does destroying a document prevent reliance on a copy?
It can. Where the party seeking to rely on secondary evidence destroyed or lost the original through their own fault, many systems close the route, on the basis that a party should not benefit from removing the best evidence. Routine destruction under a retention policy before any dispute arose is generally treated differently from destruction after the material became relevant. The circumstances therefore matter a great deal, and they need evidencing rather than asserting.
Sources
- Federal Rules of Evidence — Rule 1002, Requirement of the Originallaw.cornell.edu
- Federal Rules of Evidence — Rule 1003, Admissibility of Duplicateslaw.cornell.edu
- Federal Rules of Evidence — Rule 1004, Admissibility of Other Evidence of Contentlaw.cornell.edu
- Federal Rules of Evidence — Rule 1005, Copies of Public Recordslaw.cornell.edu
- Federal Rules of Evidence — Rule 1008, Functions of the Court and Jurylaw.cornell.edu
- Legal Information Institute — Best Evidence Rulelaw.cornell.edu
True Justice Record is a publication, not a law firm. This article states general rules and cites its sources; it is not advice about any particular case, and the law differs by state and changes over time.
More in When the Proof Does Not Exist
Delay, Memory and What Is Recoverable
Delay affects evidence unevenly. Volatile electronic material is overwritten within weeks, institutional records survive for defined retention periods, and public registers persist for decades. Memory declines continuously while confidence does not, which is why late accounts can be both detailed and unreliable. Knowing the decay rates determines what to secure first.
Preserving Proof Before It Is Needed
Evidence problems are usually created long before anybody anticipates a dispute. Keeping originals, documenting arrangements when they are made, using traceable payments, obtaining records while institutions still hold them and writing brief contemporaneous notes prevent most of the difficulties that later require reconstruction, secondary evidence or explanation.
Evidence Destroyed by Somebody Else
Where an opponent destroyed evidence after a duty to preserve arose, remedies including inferences, exclusions and sanctions become available. Where a third party or an accident destroyed it, the secondary evidence route applies instead. In every case the first task is proving what the material was, that it existed and that it is genuinely gone.