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Best Evidence Rule
The best evidence rule generally requires that to prove the content of a writing, recording, or photograph, a party must present the original document rather than a copy or testimony about it, unless a recognized exception applies.
What it actually is
The rule applies specifically when a party seeks to prove what a writing, recording, or photograph says or shows, not to all facts in a case. It appears during evidentiary disputes, typically when one side tries to admit a copy or oral testimony instead of the original. Courts may accept secondary evidence if the original is lost, destroyed, or otherwise unavailable through no fault of the offering party.
Why it matters in your case
In practical terms, this rule protects the integrity of evidence by preventing inaccuracies or misinterpretations that can arise from imperfect copies or human recollection. It also forces parties to preserve and produce the most reliable version of key documents early in litigation.
The common misunderstanding
Many people mistakenly think the rule means a party must always present the strongest possible evidence for every fact, but it applies only to proving the contents of writings, recordings, or photographs. Another common confusion is that an original must be produced even when the original is not actually being challenged.
Get the actual rule
Definitions are orientation; rules are authority
This page explains the concept. When it matters to your case, read the rule that governs it in your court — we hold Texas, federal and Washington court rules word for word, and every state's official resources are on the state pages. If someone cites a case at you, check that it exists first.
Related
Terms that travel with this one
General explanation, not legal advice, and not specific to any state — procedures and deadlines vary by jurisdiction and court. If you can get a lawyer or free legal aid, do: every real option.