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How does the presence of a jury influence rules of evidence?
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Procedural law
Justinian I, detail of a 6th-century mosaic at the Church of San Vitale, Ravenna, Italy.
In the context of procedural law, the presence of a jury significantly shapes the rules of evidence. Because juries consist of laypersons rather than professional judges, common-law systems have developed formalistic regulations to ensure that jurors are not misled by evidence that may appear plausible or emotionally compelling but lacks reliability.12
The influence of the jury on these rules includes:
- Exclusionary Rules: To protect the jury, the law restricts the admissibility of certain forms of evidence. A primary example is the hearsay rule, which limits testimony based on what a witness heard others say, as such evidence cannot be tested through cross-examination or solemn oath.34
- Judicial Supervision: The judge acts as a gatekeeper, deciding what evidence the jury is permitted to hear. If a party believes evidence violates an exclusionary rule, they must raise an objection for the judge to rule upon.52
- Procedural Formalism: Because juries cannot be reassembled easily, common-law trials must be conducted in a concentrated fashion. This necessitates discovery procedures to establish factual disputes before the trial begins, ensuring the jury receives information in a straightforward manner.1
In contrast, legal systems without juries—such as those in continental Europe—typically allow judges to consider any evidence they deem pertinent, as professional judges are considered better equipped to evaluate the weight of potentially misleading testimony.34