The best evidence rule requires a party seeking to prove the content of a writing, recording, or photograph to produce the original, rather than describing its contents through testimony or a copy. The rule targets the risk that memory or a secondhand description of a document's content is less reliable than the document itself when the document's precise wording or content is what matters.

The rule has significant exceptions: duplicates are generally treated as equivalent to originals unless there is a genuine question about authenticity, and if the original is lost, destroyed, unobtainable, or in the opposing party's control and not produced after notice, secondary evidence of its contents becomes admissible. The rule applies only when a party is trying to prove what a document says, not merely that an event happened which happens to be documented somewhere.

Juricratic's ingestion pipeline preserves the original source alongside any extracted or summarized version, so a simulated matter's evidence record can distinguish a primary document from a derivative description of it, keeping the two epistemically distinct rather than blending them.

Litigators confirm they can produce originals — or qualify for an exception — for any document whose exact content is central to a claim or defense, and build a record early if an original has been lost or is held by a third party, so admissibility is not a surprise at trial.