Fighting DUI Charges in Boise, Ada County & Canyon County

A DUI charge in Idaho is serious. Beyond criminal penalties, a conviction affects your employment, insurance rates, professional licenses, and quality of life. At Gem State Attorneys, Jordan McCrea aggressively challenges DUI charges by attacking the evidence against you, questioning police procedures, and identifying weaknesses in the prosecution's case.

Jordan's three+ years as a public defender defending DUI cases gives him deep knowledge of how Boise, Ada County, and Canyon County law enforcement conduct DUI investigations. He knows the common mistakes police make—and how to use those errors to your advantage.

Idaho DUI Laws: Idaho Code 18-8004

Idaho Code 18-8004 makes it illegal to drive under the influence of alcohol, drugs, or any combination of alcohol and drugs. There are two distinct types of DUI charges in Idaho:

Per Se DUI

A per se DUI means your breath or blood test result was at or above the legal limit. No additional proof of impairment is required — the test result alone is sufficient. The legal limits are:

  • Age 21 and Older: BAC of 0.08% or higher
  • Under Age 21: Any BAC of 0.02% or higher
  • Commercial Drivers: BAC of 0.04% or higher
  • Drivers on Probation: BAC of 0.00% is required

Importantly, Idaho requires two breath samples during evidentiary testing. In State v. Mills, 128 Idaho 426, 913 P.2d 1196 (Ct. App. 1996), the court indicated that if a breath sample falls below the legal limit, the State should not move forward with prosecution under the per se theory. This is a critical defense that Jordan evaluates in every DUI case involving breath testing.

Impaired DUI

Even if your BAC is below 0.08%, you can still be charged with DUI under the impairment theory. Under this theory, the State must prove that your ability to drive was actually impaired by alcohol, drugs, or a combination of both — regardless of what the test result shows. This means field sobriety tests, officer observations, driving behavior, and other evidence become central to the case.

Drug DUI & Combined Substance DUI

DUI in Idaho is not limited to alcohol. You can be charged with DUI for driving under the influence of illegal drugs, prescription medications, over-the-counter drugs, or any combination of drugs and alcohol. Drug DUI cases often rely on blood testing and testimony from a Drug Recognition Expert (DRE), and they present their own unique set of defense opportunities.

DUI Penalties in Idaho

Idaho takes DUI seriously. A conviction can mean jail time, significant fines, license suspension, mandatory alcohol treatment, and a permanent criminal record. Penalties increase with each subsequent offense, and aggravating factors — such as a high BAC, an accident, or a minor in the vehicle — can make things worse. A third DUI within ten years is charged as a felony.

The good news is that a charge is not a conviction. Every case is different, and there are often defenses available that can result in reduced charges, lesser penalties, or dismissal. The sooner you speak with an experienced DUI attorney, the more options you have.

Frequently Asked Questions About DUI in Idaho

Click a question to see the answer.

The legal limit is 0.08% BAC for drivers age 21 and over. Drivers under 21 cannot have any detectable BAC (0.02% or higher). Commercial drivers have a 0.04% limit. Drivers on DUI probation must typically maintain 0.00% BAC. Keep in mind that you can still be charged with DUI even if you are below 0.08% if the officer believes your ability to drive was impaired.
An ALS (Administrative License Suspension) is a civil penalty imposed by the Idaho Transportation Department — it is completely separate from any criminal court proceedings. If you fail or refuse an evidentiary test (breath or blood), the arresting officer will serve you with a Notice of Suspension, and your license will be suspended after 30 days. This happens automatically regardless of whether you are ever convicted of DUI in court. A court-ordered license suspension is a separate penalty that comes as part of a criminal DUI conviction or sentence. You can face both an ALS suspension and a court suspension, and they may or may not run concurrently depending on the circumstances of your case.
Idaho has an implied consent law — by driving on Idaho roads, you have implicitly consented to evidentiary testing if an officer has reasonable cause to believe you are under the influence. If you refuse a breath or blood test, you face an automatic ALS suspension of one year for a first refusal, or two years for a subsequent refusal within ten years. These penalties are often more severe than the suspension for failing the test. Additionally, while your refusal cannot be used as direct evidence of guilt at trial, the prosecution may be able to reference the fact that you refused. In some cases, law enforcement may also obtain a warrant to draw your blood without your consent.
You have only seven (7) days from the date you are served with the Notice of Suspension to request an administrative hearing to challenge the ALS suspension. This is a very short window, and missing this deadline means you waive your right to contest the suspension. This is one of the most important reasons to contact a DUI attorney immediately after your arrest — not next week, not after your court date, but right away. Jordan can file the hearing request on your behalf and represent you at the ALS hearing.
Idaho may require an interlock device as a condition of getting a restricted driving permit during your ALS suspension period, or as part of your criminal sentence. For a first DUI conviction, the court may order an interlock device for a period determined by the judge. For second and subsequent offenses, an interlock device is typically mandatory. The device requires you to provide a breath sample before starting your vehicle and at random intervals while driving. You are responsible for the cost of installation and monthly monitoring fees. In some cases, agreeing to an interlock device early can help you get limited driving privileges sooner.
Yes. Breath testing machines must be properly calibrated and maintained, and the operator must follow specific protocols. Blood draws must follow chain-of-custody procedures and be performed by qualified personnel. Jordan investigates calibration records, maintenance logs, operator certifications, and testing procedures to identify errors or violations that could lead to the suppression or weakening of test results. Medical conditions such as GERD, diabetes, or certain diets can also produce falsely elevated breath test readings.
A first-time DUI in Idaho is a misdemeanor that carries up to 6 months in jail, fines up to $1,000 plus court costs and fees, a court-ordered license suspension of up to 180 days (in addition to any ALS suspension), mandatory alcohol evaluation and treatment, and a permanent criminal record. Penalties can increase with aggravating factors such as high BAC, an accident, or a minor in the vehicle.
In some cases, yes. Depending on the facts — such as a borderline BAC, procedural errors, or weak evidence — it may be possible to negotiate a reduction to inattentive driving or another lesser offense. This can result in reduced penalties and avoid the specific consequences that come with a DUI conviction on your record. Jordan evaluates every case individually to determine whether negotiation or trial is the best strategy, but ultimately the decision on how to proceed is always yours.
Repeat DUI offenses in Idaho carry significantly increased penalties. A second DUI within ten years is still a misdemeanor but carries up to one year in jail, fines up to $2,000, a license suspension of up to two years, mandatory interlock device installation, and extended treatment requirements. A third DUI within ten years becomes a felony, punishable by up to ten years in prison, up to $5,000 in fines, and a license suspension of up to five years. The stakes are significantly higher with repeat offenses, making experienced legal representation critical.

Defenses Against Idaho DUI Charges

A DUI case can involve much more than just a breath or blood test result. The circumstances of the stop, the procedures used, and the evidence collected all need to be carefully reviewed. Here are some of the defenses Jordan evaluates in every case:

Improper Traffic Stop

Police must have reasonable suspicion to stop your vehicle. Reasonable suspicion is more than a hunch — it requires specific facts suggesting a traffic violation or criminal activity. Common reasons for improper stops include stopping for a non-violation, racial profiling, or arbitrary checkpoints. If the stop was illegal, all evidence obtained afterward can potentially be suppressed.

Flawed Standardized Field Sobriety Tests (SFSTs)

SFSTs (walk-and-turn, one-leg stand, horizontal gaze nystagmus) are subjective and can be unreliable. Medical conditions, poor lighting, road conditions, and officer interpretation can all affect results. Jordan examines how the SFSTs were administered and whether they were conducted according to the standardized protocols.

Breathalyzer Defects

Breathalyzers are machines — they can malfunction, fall out of calibration, or be operated incorrectly. Maintenance records, calibration certificates, and operator training can all be reviewed and challenged. Additionally, certain medical conditions, devices, or medications can produce artificially elevated readings.

Rising BAC Defense

Your BAC can increase during the time between driving and testing. If you're tested 1-2 hours after driving, your BAC at the time of the test might have been higher than it was when you were actually behind the wheel. This rising BAC defense can be an important factor in your case.

Improper Miranda Warnings

If you were subjected to custodial interrogation without proper Miranda warnings, any statements you made can potentially be excluded from evidence. Officers sometimes ask leading questions or use coercive tactics. Statements obtained in violation of your rights may be inadmissible.

Medical Conditions

Certain medical conditions like acid reflux (GERD), diabetes, or mouth alcohol can artificially elevate breathalyzer readings. Medications can also affect test results. These defenses may require expert testimony and thorough investigation.

Lack of Probable Cause

For a valid DUI arrest, police need probable cause — a reasonable belief based on the totality of the circumstances that you were driving under the influence. Without adequate probable cause, the arrest may be challenged and evidence can potentially be suppressed.

What to Do After a DUI Arrest in Boise

Your actions immediately after arrest are critical:

  1. Exercise Your Right to Counsel: Say clearly, "I want to speak to an attorney." Do not answer questions without Jordan present.
  2. Request an Implied Consent Hearing: If you refused a breathalyzer or blood test, you have 7 days to request a hearing with the Idaho Department of Motor Vehicles. This is a separate proceeding from criminal court.
  3. Understand License Suspension: Your driver's license may be suspended, but you may be eligible for a work permit to maintain employment.
  4. Contact Gem State Attorneys Immediately: Call (208) 900-9529. Early intervention by your attorney can preserve evidence, identify witness testimony, and develop your defense strategy.
  5. Do Not Post on Social Media: Anything you post can be used against you. Avoid discussing your case online.

Breath Test Refusal & License Suspension

In Idaho, refusing a breath test triggers automatic administrative license suspension (Administrative License Suspension or ALS) through the Department of Motor Vehicles—separate from any criminal case. First refusal results in 12-month suspension; refusals within 10 years carry 2+ year suspensions.

However, you have the right to challenge the ALS suspension in an administrative hearing. Additionally, although refusal cannot be used as direct evidence of guilt at trial, prosecutors can comment on refusal. Jordan fights both the administrative suspension and criminal charges simultaneously.

Our DUI Defense Strategy

Jordan approaches every DUI case comprehensively:

  • Police Report Analysis: Detailed review of arrest reports, dispatch records, and video footage.
  • Stop Legality: Investigation into whether the traffic stop was justified.
  • Test Procedures: Challenge to breathalyzer calibration, operator certification, and testing protocols.
  • Discovery Requests: Demanding all evidence including dashcam/bodycam footage, maintenance records, and dispatch tapes.
  • Expert Consultation: Retention of toxicology or breathalyzer experts when necessary.
  • Negotiation: Discussion with prosecutors about reducing charges to reckless driving or other lesser offenses.
  • Trial Preparation: If necessary, thorough preparation for trial before a Boise jury.

Common DUI Mistakes That Hurt Your Case

  • Talking to police without an attorney
  • Failing to request an administrative hearing for license suspension
  • Delaying in contacting a DUI attorney
  • Discussing your case on social media or with others
  • Driving with a suspended license while waiting for trial