Idaho DUI Defense Guide — Charges & Options
DUI basics, court steps, and what happens next
A DUI arrest triggers two separate proceedings that run at the same time. The criminal case decides guilt, penalties, and your record. The administrative case decides whether your license is suspended — often on a much shorter deadline. Missing a step in one track can limit your options in the other, which is why understanding both paths from the start matters.
The two tracks: criminal and administrative
Track 1: Criminal prosecution
The criminal case is a court proceeding where the state must prove DUI beyond a reasonable doubt. Idaho's per se BAC limit is 0.08 §18-8004, but you can also be charged based on impairment regardless of BAC. A first offense is classified as a misdemeanor.
Track 2: Administrative license action
The administrative action is handled separately from the criminal case §18-8002A. It can result in license suspension even if the criminal case is eventually dismissed. You have 7 days from receipt of notice of suspension to request a hearing to contest the suspension.
What triggers enhanced penalties
- BAC ≥ 0.20 (excessive DUI — separate statute §18-8004C)
- Great bodily harm or disfigurement (aggravated DUI)
- Minor passenger
- Prior felony DUI
Implied consent and chemical testing
Idaho has an Implied consent law: by driving on Idaho roads, you have implicitly consented to chemical testing when lawfully arrested for DUI. Refusing the test carries its own consequences: 1-year absolute license suspension (no restricted license); $250 civil fine; 1-year IID required after suspension ends. In Idaho, refusal to submit to chemical testing is admissible as evidence at trial.
BAC thresholds that matter
| Category | BAC Limit | Consequence | |
|---|---|---|---|
| Standard per se | 0.08 §18-8004 | DUI charge without other evidence of impairment | |
| Enhanced penalty | 0.20 §18-8004C | Higher minimum penalties and longer license suspension | |
| Under 21 | 0.02 | Zero tolerance violation | |
| Commercial (CDL) | 0.04 §49 C.F.R. § 383.51 | CDL disqualification |
Why timing matters most
DUI cases are unusually time-sensitive. The administrative hearing deadline begins running from the date of arrest or notice — not from the first court date. Evidence (dashcam footage, witness recollections, calibration records) can deteriorate. Early attorney involvement can preserve options that disappear with delay.
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Frequently Asked Questions
General answers to common questions. Specific outcomes depend on your facts and timing.
If you have a deadline, court notice, or upcoming hearing, mention it when requesting assistance so timing can be evaluated promptly.
- Per se limit: BAC of 0.08 or higher
- Commercial vehicle limit: 0.04 (set by separate statute in some states)
- Under 21: 0.02 (zero tolerance; set by separate statute in some states)
- Hearing deadline: 7 days from receipt of notice of suspension
- First offense suspension: 90 days (30 days absolute, then restricted permit available for test failures); 1 year absolute for refusals