Best Evidence Rule
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
In law, the rule demands that the best obtainable version of evidence be produced, an original document rather than a photocopy, direct testimony rather than hearsay. The rationale extends beyond procedure: every step of copying or summarizing adds distortion and creates room for manipulation, so reliability falls with each layer removed from the source. Applied to medicine, policy and product decisions, the same principle means grading evidence by strength and giving the highest tier the most weight, while labeling weaker forms as uncertain.
SCAFFOLDING EFFECT
Reduce cognitive load
- Go to the source: prefer the original record over any summary whatsoever of it. - Grade the evidence: rank what you currently hold by strength before deciding on it. - Mark uncertainty: label low-grade evidence rather than treating it as equally valid.
Anchor fast decisions
Each act of transmission re-encodes the evidence, and each re-encoding loses detail and adds interpretation, so reliability decays with the number of intermediaries. The original record is the point where distortion is minimal, and a copy can always be checked against it while a copy of a copy cannot. Grading evidence by tier applies the same logic: stronger designs give the underlying fact less room to hide, so decisions built on them fail less often.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Best_evidence_ruleverified
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