The Jury System in Idaho: Selection, Duty, and Deliberation

Idaho's jury system operates as a constitutional mechanism for citizen participation in the administration of justice, structured by state statute and court rule. This page covers the legal framework governing jury selection, the obligations imposed on summoned jurors, the procedural phases of jury service, and the boundaries that distinguish civil from criminal jury function under Idaho law. The Idaho Jury System Overview provides additional structural context for these processes within the broader court hierarchy.

Definition and Scope

The right to trial by jury in Idaho derives from two sources: Article I, Section 7 of the Idaho Constitution, which guarantees the right in criminal prosecutions, and the Seventh Amendment to the U.S. Constitution, which preserves it in federal civil matters. For state civil proceedings, Idaho's right to jury trial is protected by statute and court rule, primarily through the Idaho Rules of Civil Procedure (I.R.C.P. Rule 38) and the Idaho Criminal Rules.

Idaho courts empanel two distinct jury types. A petit jury hears evidence and renders a verdict in a specific case — either civil or criminal. A grand jury, composed of 12 to 16 citizens under Idaho Code § 19-1001, reviews prosecutorial evidence to determine whether probable cause exists to indict a defendant in a felony matter. Grand jury proceedings are not open to the public, and the grand jury does not determine guilt.

Jury size differs by case type. Criminal felony juries consist of 12 jurors. Civil juries may consist of as few as 6 jurors by stipulation of the parties under I.R.C.P. Rule 48. Misdemeanor criminal juries may also be composed of 6 members in Idaho's magistrate courts.

The scope of this page is limited to Idaho state court jury processes. Federal jury selection and service within Idaho's federal district — the United States District Court for the District of Idaho — is governed by the Jury Selection and Service Act of 1968 (28 U.S.C. § 1861 et seq.) and falls outside this page's coverage. Tribal court jury practices, where applicable, are also not covered here; those processes are addressed separately in Idaho Tribal Law and Sovereignty.

How It Works

Jury selection and service in Idaho proceeds through five discrete phases:

1. Master Jury List Compilation. Under Idaho Code § 2-206, the master jury list is drawn from voter registration rolls and, in most Idaho counties, supplemented by driver's license and state ID records maintained by the Idaho Transportation Department. The combined list is maintained by county clerks in each of Idaho's 44 counties.

2. Summons and Qualification. Prospective jurors receive a summons from the district court clerk. Under Idaho Code § 2-209, a prospective juror must be a U.S. citizen, at least 18 years of age, a resident of the summoning county, able to communicate in English, and not disqualified by prior felony conviction (unless civil rights have been restored).

3. Voir Dire Examination. The voir dire process allows the judge and attorneys to question prospective jurors about potential bias. Idaho courts permit both challenges for cause — unlimited in number, granted when a juror cannot be impartial — and peremptory challenges, which require no stated reason. Under Idaho Criminal Rule 24, each side in a felony trial receives 10 peremptory challenges; in misdemeanor cases, each side receives 4.

4. Empanelment and Trial. Once seated, jurors receive instructions from the judge regarding applicable law. Idaho district judges deliver pattern jury instructions drawn from the Idaho Jury Instructions (IDJI), maintained by the Idaho Supreme Court's Jury Instruction Committee. Jurors are prohibited from conducting independent research, including internet searches, under judicial admonishment at the outset of trial.

5. Deliberation and Verdict. Criminal verdicts in Idaho must be unanimous under Article I, Section 8 of the Idaho Constitution. Civil verdicts require agreement by at least 5 of 6 jurors, or 10 of 12, depending on jury size, per I.R.C.P. Rule 48(b).

Common Scenarios

Criminal Felony Trial. In a felony prosecution under Idaho Criminal Procedure Rights standards, the defendant has an absolute right to a 12-person jury. The prosecution bears the burden of proof beyond a reasonable doubt. Jurors deliberate in private and must reach a unanimous decision; a hung jury results in a mistrial, and the prosecutor retains discretion to retry the case.

Civil Tort Litigation. In cases such as personal injury claims governed by Idaho Tort Law, either party may demand a jury trial under I.R.C.P. Rule 38. The burden of proof is preponderance of the evidence — a materially lower threshold than in criminal proceedings. A non-unanimous civil verdict (5 of 6 or 10 of 12) is legally sufficient.

Grand Jury Indictment. Grand juries in Idaho are convened at the discretion of a district court judge or upon petition of the prosecuting attorney. Under Idaho Code § 19-1101, a true bill of indictment requires the concurrence of 12 grand jurors. The target of a grand jury investigation has no right to appear or present evidence unless authorized by the grand jury itself.

Juror Hardship and Exemption. Idaho law recognizes statutory exemptions and discretionary excusals. Active-duty military personnel, law enforcement officers, and licensed physicians are among those eligible for excusal under Idaho Code § 2-212. Documented financial hardship may also support an excusal request, evaluated by the presiding judge.

Civil Rights and Employment Cases. Jury trials in Idaho employment discrimination cases brought under the Idaho Human Rights Act (Title 67, Chapter 59, Idaho Code) follow civil jury procedures. Related protections and procedural frameworks are covered under Idaho Civil Rights Protections and Idaho Employment Law Overview.

Decision Boundaries

Jury vs. Judge (Bench Trial). A party in a civil matter may waive the right to jury trial by failing to file a timely demand under I.R.C.P. Rule 38(b), defaulting to a bench trial decided solely by the judge. In criminal matters, a defendant may waive jury trial with court approval under Idaho Criminal Rule 23, but the prosecution must also consent.

State vs. Federal Jurisdiction. Cases arising under federal law — including federal civil rights claims under 42 U.S.C. § 1983 or federal criminal charges — are heard in the U.S. District Court for the District of Idaho, not in Idaho state courts. The jury selection rules, juror qualification standards, and verdict requirements differ. The Regulatory Context for the Idaho U.S. Legal System page addresses jurisdictional boundaries between state and federal courts.

Juror Conduct and Misconduct. Post-verdict juror misconduct — such as concealing bias during voir dire or conducting prohibited independent research — can serve as grounds for a motion for new trial under I.R.C.P. Rule 59 or Idaho Criminal Rule 34. Courts apply a high threshold to set aside verdicts on juror misconduct grounds; the moving party must demonstrate actual prejudice, not mere irregularity.

Deliberation Secrecy. Under Idaho common law and the Idaho Rules of Evidence (I.R.E. 606(b)), jurors may not testify about internal deliberation processes in post-trial proceedings, except in narrowly defined circumstances involving extraneous prejudicial information or outside influence on the jury.

Scope Limitations. This page does not address jury selection in Idaho municipal courts, arbitration panels, or administrative hearing bodies under the Idaho Administrative Law and Agencies framework. It also does not cover sentencing proceedings, which involve separate procedural rules addressed under Idaho Sentencing Guidelines. For a comprehensive entry point into Idaho's legal framework, the Idaho Legal Services Authority index provides a structured reference directory across all major practice areas.

References

• Idaho Legislature — Idaho Code Full Text
• Idaho Constitution, Article I
• Idaho Supreme Court — Court Rules
• Idaho Jury Instructions (IDJI) — Idaho Supreme Court
• [Idaho Code § 2-206 through § 2-212 — Jury Selection](https://legislature.idaho.gov/statutesrules/id