A DUI in Idaho carries mandatory jail time, steep fines, and license suspension. Here's what Idaho law actually requires — and why the next 72 hours are critical.
A DUI arrest in Idaho sets two parallel legal processes in motion simultaneously. Missing the deadlines in either one can result in losing your license for months — even if you're ultimately found not guilty of the criminal charge.
The Two Tracks: Criminal and Administrative
*The Criminal Case* is the DUI charge filed in court. It moves through arraignment, pre-trial motions, and potentially trial. Your criminal defense attorney challenges the stop, the field sobriety tests, and the chemical test results.
*The Administrative License Suspension* (ALS) is handled separately by Idaho Transportation Department (ITD). This is a civil matter — ITD can suspend your license independent of what happens in criminal court. You have only 7 days from the date of arrest to request a hearing to contest the suspension. Miss that deadline and your license is automatically suspended.
Idaho DUI Penalties
*First Offense (BAC 0.08-0.19):* - Minimum 10 days in jail (or 48 hours jail + 240 hours community service) - Fine up to $1,000 - License suspension: 90-180 days - Possible ignition interlock device requirement
*First Offense (BAC 0.20 or higher — "Excessive DUI"):* - Mandatory 10 days in jail (no alternative) - Fine up to $2,000 - License suspension: 1 year - Ignition interlock required after suspension
*Second Offense (within 10 years):* - Mandatory minimum 10 days in jail, up to 1 year - Fine up to $2,000 - License suspension: 1 year - Ignition interlock required
*Felony DUI (third offense within 10 years, or DUI with serious injury):* - Up to 10 years in prison - Fine up to $5,000 - License suspension up to 5 years
Field Sobriety Tests
You are not required to submit to field sobriety tests in Idaho. These tests — walk-and-turn, one-leg stand, horizontal gaze nystagmus — are subjective and often challenged successfully in court. However, refusing a chemical test (breath or blood) after arrest triggers the same administrative license suspension and can be used against you in court.
Your Rights at a DUI Stop
- You have the right to remain silent. Politely decline to answer questions about where you've been or how much you've had to drink. - You have the right to an attorney. After arrest, clearly and unambiguously invoke this right. - You do not have to consent to a search of your vehicle without a warrant, though refusal may escalate the encounter.
Why the First 72 Hours Matter
The most effective DUI defenses are built immediately. Evidence — dashcam footage, police body cam, breathalyzer calibration records, witness accounts — must be preserved quickly. The 7-day window for requesting an ALS hearing is non-negotiable.
If you or someone you know has been arrested for DUI in Idaho, call Snake River Law Group immediately. We handle criminal defense cases throughout Twin Falls County and the Magic Valley, and we're available 24/7 for criminal emergencies at (208) 555-0143.
*Past results do not guarantee future outcomes.*
Questions About Your Situation?
This article is general information, not legal advice. Every case is different. Snake River Law Group offers free consultations — talk to an Idaho attorney about your specific situation at no cost.