Relevance of Evidence in Court

Aug 23, 2025

Overview

This lecture reviews the concept of evidence relevance under Rules 401 and 402, using State v. Newman to illustrate how relevance depends on whether a fact is of consequence to the case.

Rules of Relevance (401 & 402)

  • Rule 401: Evidence is relevant if it makes a fact more or less likely and that fact is of consequence in the case.
  • Rule 402: Relevant evidence is admissible unless otherwise excluded (e.g., by privilege, constitutional rules); irrelevant evidence is not admissible.

Application: State v. Newman

  • State v. Newman addresses whether the defendant can present expert testimony about the possibility of "sleep driving" as a defense in a DUI case.
  • The defendant claims he may have driven while asleep and drunk, arguing he did not voluntarily drive.
  • The case pivots on whether the possibility of sleep driving is a fact of consequence for the crime of DUI.
  • The court finds that, in most crimes (including DUI), a voluntary act is a required element, even if not explicitly stated in the statute.
  • If the defendant drove while asleep, he did not act voluntarily and thus may not be guilty of DUI.
  • The relevance of evidence depends on whether it relates to elements (like voluntariness) that the prosecution must prove.

Determining Facts of Consequence

  • To judge relevance, identify the elements the prosecution or plaintiff must prove in the case.
  • Sometimes, courts must interpret statutes to find implicit requirements (e.g., voluntariness in DUI).

Key Terms & Definitions

  • Relevant Evidence — Evidence that makes a fact more or less probable and relates to a fact of consequence.
  • Fact of Consequence — A fact that matters to the legal outcome of the case, typically tied to required legal elements.
  • Voluntary Act — A conscious, intentional action required for most criminal liability.
  • Sleep Driving — Driving while asleep, potentially negating the voluntary act required for DUI.

Action Items / Next Steps

  • Read State v. Newman to understand how courts determine facts of consequence and apply Rules 401 and 402.
  • Prepare for a discussion on whether the reason an officer stops a driver for DUI is a fact at issue.