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Home/State Laws/Montana

Montana Mock Trial Rules

West

MT · Capital: Helena

Evidence Rules

Montana Rules of Evidence

Citation: Mont. R. Evid. 101–1008

Key Differences from Federal Rules of Evidence

  • Montana Rule 702 applies the Daubert standard for expert testimony, with Montana courts granting broader discretion to trial judges than federal courts in gatekeeping decisions
  • Montana Rule 404(b) requires clear and convincing evidence that the other act occurred before such evidence can be admitted, a higher threshold than FRE 404(b)
  • Montana does not have a direct equivalent to FRE 807 (residual exception); instead, Montana courts rely on specific enumerated hearsay exceptions

Notable Rules

RuleDescription
Mont. R. Evid. 412Montana's rape shield rule excludes opinion or reputation evidence of the victim's past sexual conduct; narrow exceptions require an in camera hearing
Mont. Code Ann. § 46-16-130Montana abolished the insanity defense in 1979; defendants may present evidence of mental disease or defect only to negate the required mental state element

Trial Procedure

Civil Procedure

Mont. R. Civ. P.

Criminal Procedure

Mont. Code Ann. Title 46

Key Features

  • Montana Constitution provides a strong right of privacy (Art. II, § 10) that impacts search and seizure law and admissibility of evidence
  • Criminal cases must be brought to trial within 6 months after plea (Mont. Code Ann. § 46-13-401)
  • Montana uses a single-tier trial court system (District Courts) for all felony and civil cases over small claims limits

Jury Rules

6

Civil Jury Size

12

Criminal Jury Size

No

Unanimity Required

  • Civil juries consist of 6 jurors; verdict requires 2/3 agreement (4 of 6)
  • Criminal felony juries consist of 12 jurors with unanimous verdicts required
  • Misdemeanor juries consist of 6 jurors; unanimous verdict required

Special Features

Abolition of Insanity Defense

Montana is one of a few states that abolished the insanity defense (1979). Defendants may introduce mental health evidence only to negate mens rea, not as an affirmative defense.

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