Wyoming Jury System: Selection, Duties, and Grand Jury Process
Wyoming's jury system operates under a dual framework governing both trial juries (petit juries) and grand juries, each with distinct selection procedures, constitutional foundations, and operational mandates. The system is anchored in the Wyoming Rules of Criminal Procedure, the Wyoming Rules of Civil Procedure, and Article 1, Section 9 of the Wyoming Constitution. Understanding how these structures function is essential for litigants, attorneys, and anyone navigating Wyoming's broader legal system.
Definition and scope
Wyoming recognizes two categories of jury: the petit jury, which renders verdicts in civil and criminal trials, and the grand jury, which evaluates whether sufficient probable cause exists to indict a defendant on felony charges. Both are composed of Wyoming residents drawn from the jury pool of the relevant county or judicial district.
The constitutional right to a jury trial in Wyoming criminal cases is established in Article 1, Section 9 of the Wyoming Constitution, which preserves the right to trial by jury for serious offenses. For civil matters, Wyoming Rule of Civil Procedure 38 governs the right to demand a jury trial. The Wyoming Legislature has also codified jury-related procedures under Wyoming Statutes Title 1, Chapter 11 (civil jury procedures) and Title 7, Chapter 11 (criminal jury procedures).
Scope limitations: This page addresses Wyoming state court jury procedures only. Federal jury procedures in Wyoming — governed by the Federal Rules of Civil and Criminal Procedure and administered through the U.S. District Court for the District of Wyoming — are not covered here. Tribal court proceedings and municipal court proceedings that do not convene juries also fall outside the scope of this reference. For the broader regulatory context for Wyoming's legal system, including constitutional and statutory frameworks, see the linked resource.
How it works
Jury Selection: The Voir Dire Process
Juror pools in Wyoming are assembled from lists maintained by the Wyoming Department of Transportation (driver's license records) and voter registration rolls, as authorized under Wyoming Statute § 1-11-102. The clerk of the district court summons prospective jurors by random selection from this combined source list.
The selection process follows a structured sequence:
- Summons issuance — The court issues juror summonses to a random panel drawn from the master list for the relevant county.
- Juror qualification — Prospective jurors must be U.S. citizens, Wyoming residents, at least 18 years of age, and not disqualified by felony conviction or mental incapacity under Wyoming Statute § 1-11-105.
- Voir dire examination — Attorneys and the judge question prospective jurors to assess impartiality. Each side may exercise an unlimited number of challenges for cause (bias, conflict of interest) and a limited number of peremptory challenges — 3 for each side in civil cases under Wyoming Rule of Civil Procedure 47, and up to 8 per side for felony trials under Wyoming Rule of Criminal Procedure 24.
- Empanelment — A standard petit jury consists of 12 jurors in felony criminal cases and 6 jurors in most civil cases, with alternates seated at the court's discretion.
Trial Jury Duties
Once empaneled, jurors are obligated to attend all trial sessions, evaluate admitted evidence, apply jury instructions issued by the judge, and deliberate in private. In Wyoming criminal cases, a guilty verdict requires unanimous agreement among all 12 jurors (Wyoming Rule of Criminal Procedure 31). Civil verdicts require agreement of at least 5 of 6 jurors unless the parties stipulate otherwise.
Grand Jury Process
Wyoming grand juries consist of 12 members with 9 required to return an indictment, per Wyoming Statute § 7-5-103. Grand juries are convened by district courts to examine felony charges. Unlike trial juries, grand jury proceedings are closed to the public, and the defendant has no right to present evidence or cross-examine witnesses at this stage.
The grand jury's function is limited to a probable cause determination — it does not adjudicate guilt. If at least 9 grand jurors concur that probable cause exists, they return a true bill (indictment). If the requisite votes are not reached, a no bill is returned and the charges are dismissed absent further proceedings.
Common scenarios
Three recurring operational contexts define most jury activity in Wyoming district courts:
- Felony criminal trials — Cases involving charges such as aggravated assault, drug trafficking, or homicide require a 12-member petit jury. The prosecution bears the burden of proof beyond a reasonable doubt, and unanimous verdict is mandatory.
- Civil disputes above the small claims threshold — Contract disputes, personal injury actions, and property disputes tried in district court typically proceed before a 6-member jury when a timely demand is filed under Wyoming Rule of Civil Procedure 38.
- Grand jury indictment proceedings — Prosecutors in Wyoming may initiate felony charges either by grand jury indictment or by filing a criminal information following a preliminary hearing. The grand jury route is less common but constitutionally preserved and used selectively in complex or sensitive prosecutions.
For an overview of how criminal charges proceed after indictment, see Wyoming Criminal Procedure.
Decision boundaries
The jury system in Wyoming has defined structural limits that separate its authority from judicial and prosecutorial functions:
| Decision Type | Jury Authority | Outside Jury Authority |
|---|---|---|
| Factual guilt or innocence | Petit jury determines | Judge determines in bench trials |
| Probable cause for indictment | Grand jury determines | Preliminary hearing judge (alternative path) |
| Sentencing | Not within jury authority | District court judge under Wyoming sentencing guidelines |
| Legal rulings (admissibility, motions) | Not within jury authority | Presiding judge exclusively |
| Verdict unanimity (criminal) | Required — all 12 jurors | No partial verdict permitted in felony cases |
Jurors are bound to apply the law as instructed by the court; they have no authority to nullify statute or override jury instructions as a formal legal mechanism, though Wyoming courts acknowledge that no legal remedy exists if a jury does so in practice.
References
- Wyoming Constitution, Article 1, Section 9 — Right to Trial by Jury
- Wyoming Statutes Title 1, Chapter 11 — Civil Jury Procedures
- Wyoming Statutes Title 7, Chapter 5 — Grand Jury
- Wyoming Rules of Criminal Procedure, Rule 24 — Trial Jurors
- Wyoming Rules of Criminal Procedure, Rule 31 — Verdict
- Wyoming Rules of Civil Procedure, Rule 38 — Right to Jury Trial
- U.S. District Court for the District of Wyoming
- Wyoming Legislature — Official Statutes Portal