A first-time DUI in Idaho becomes a felony in one situation: when the impaired driver causes great bodily harm, permanent disability, or permanent disfigurement to another person. That offense is charged as aggravated driving under the influence under Idaho Code 18-8006, and it is the only path by which someone with no prior DUI history can face felony charges on a single arrest.1Idaho State Legislature. Idaho Code 18-8006 – Aggravated Driving While Under the Influence of Alcohol, Drugs or Any Other Intoxicating Substances Every other felony DUI route in Idaho requires either prior convictions or a prior excessive-BAC offense.
What Counts as Aggravated DUI
Idaho Code 18-8006 covers DUI that results in great bodily harm, permanent disability, or permanent disfigurement to another person. The injury must be to someone other than the driver, so a solo crash where only the impaired driver is hurt does not trigger the statute. The passenger in the driver’s own car, the occupant of another vehicle, a pedestrian, or a cyclist can all qualify as the injured party.
The statute does not require prior DUI history, a particular BAC level, or any specific drug. It attaches to the combination of impaired driving and serious injury. A driver stopped at 0.09 on a first-ever DUI who caused a crash with lasting injuries is in the same statutory category as a long-time offender who did the same thing.
The Misdemeanor Baseline a First DUI Normally Falls Into
Absent that injury element, a first DUI in Idaho is a misdemeanor. The ordinary first-offense penalty under Idaho Code 18-8005 is up to six months in jail and a fine of up to $1,000.2Idaho State Legislature. Idaho Code 18-8005 – Penalties
A first-time driver who registers a BAC of 0.20 or higher falls under Idaho’s “excessive concentration” statute, Idaho Code 18-8004C. That offense carries stiffer penalties than a standard first DUI, including a mandatory minimum of ten days in jail and a fine of up to $2,000, but it is still a misdemeanor on the first occurrence. It only becomes a felony on a second excessive-BAC offense within five years.3Idaho State Legislature. Idaho Code 18-8004C – Excessive Alcohol Concentration So a very high BAC alone, without injury or prior history, does not push a first offense into felony territory.
Penalties for a First-Offense Aggravated DUI
Aggravated DUI carries the highest ceiling in Idaho’s DUI statutes: up to fifteen years in state custody. Even when the court imposes a sentence other than state prison, the defendant must serve a mandatory minimum of 30 days in county jail. Fines can reach $5,000, and the court must order restitution to the victim covering medical bills, lost wages, and related expenses. In cases involving serious injury, restitution alone can reach tens of thousands of dollars.4Idaho State Legislature. Idaho Code 18-8006 – Aggravated Driving While Under the Influence of Alcohol, Drugs or Any Other Intoxicating Substances
Courts weigh the specifics of each case when choosing a sentence inside that range. The circumstances of the crash, the degree of impairment, and the severity and permanence of the victim’s injuries all shape where a sentence lands. The 30-day mandatory minimum, however, cannot be waived.
License Consequences
A felony DUI, including a first-offense aggravated DUI, triggers a minimum one-year absolute suspension of driving privileges after release from custody. During that year, no driving of any kind is permitted. The court can extend the total suspension period up to five years for aggravated DUI, and the statute offers no restricted license option during the suspension period.4Idaho State Legislature. Idaho Code 18-8006 – Aggravated Driving While Under the Influence of Alcohol, Drugs or Any Other Intoxicating Substances A work permit or hardship license is not available even for employment or family health needs.
A separate administrative suspension applies if the driver refused to submit to a BAC test at the scene. A first refusal triggers a one-year absolute suspension and a $250 civil penalty, runs independently of any court-ordered suspension, and requires an ignition interlock device for one year after the suspension ends.5Idaho State Legislature. Idaho Code 18-8002 – Tests of Driver for Alcohol Concentration, Presence of Drugs or Other Intoxicating Substances A first-time driver who both refused the test and is later convicted of aggravated DUI could face these penalties stacked.
Consequences That Outlast the Sentence
A first felony conviction carries collateral effects that do not go away when probation ends.
Federal law prohibits anyone convicted of a felony from possessing firearms or ammunition, and Idaho does not offer an automatic path to restore gun rights after a felony. Voting rights are suspended during incarceration and parole, then restored on completion of the sentence.
Commercial drivers face a separate federal disqualification. Under 49 CFR 383.51, a first DUI conviction while operating any vehicle disqualifies a CDL holder from driving commercial vehicles for at least one year, and three years if hazardous materials were involved.6eCFR. 49 CFR 383.51 – Disqualification of Drivers For a driver whose livelihood depends on a CDL, a first felony DUI effectively ends that career.
Felony convictions appear on background checks and can disqualify applicants from positions requiring security clearances, professional licenses, or work with vulnerable populations. Licensing boards for healthcare workers, teachers, and other licensed professionals typically review the conviction and may impose discipline, suspension, or revocation.
International travel is affected as well. Canada has treated impaired driving as a serious crime since December 2018, when it increased the maximum penalty for DUI offenses to ten years. Any DUI conviction can render a person inadmissible to Canada, and someone with a felony DUI would need a Temporary Resident Permit or Criminal Rehabilitation approval to cross the border.
Idaho offers very limited expungement for adult criminal convictions, and felony DUI convictions are generally not eligible. The record stays visible to employers, landlords, and licensing boards permanently.
Defenses in a First-Time Felony DUI Case
A charge is not a conviction, and the first-time setting often gives defense counsel room to work. Several lines of attack apply at the stop, the chemical test, and the sentencing hearing.
The Legality of the Stop
Under the Fourth Amendment, law enforcement needs reasonable suspicion to pull a driver over. If the officer lacked a legitimate reason for the stop, everything that followed, including field sobriety tests and BAC results, can be suppressed. The Idaho Supreme Court applied that principle in State v. Bishop, reversing a conviction and suppressing evidence where the court found the stop was not supported by reasonable suspicion.7FindLaw. State v. Bishop
Breath Test Procedure
Idaho has detailed administrative rules for breath alcohol testing. The operator must be currently certified on the specific instrument, must observe a 15-minute monitoring period before testing, must obtain two valid breath samples that correlate within 0.02 of each other, and must verify the instrument’s accuracy within 24 hours before or after the test.8Legal Information Institute. Idaho Admin. Code 11.03.01.014 – Requirements for Performing Breath Alcohol Testing If the subject vomits, burps, or regurgitates during the monitoring period, the 15-minute clock resets.9Legal Information Institute. Idaho Admin. Code 11.03.01.010 – Definitions and Abbreviations A failure at any step gives the defense a basis to challenge the reliability of the results.
Rising BAC
Alcohol takes time to absorb into the bloodstream. Someone who had a drink shortly before driving might have been below 0.08 behind the wheel but above it by the time the breath test was administered 30 or 45 minutes later. Building this defense typically requires expert testimony reconstructing the absorption timeline based on when the person drank, what they drank, body weight, and the time gap between the stop and the test. It is most effective when the gap is long and the BAC reading sits close to the legal limit.
Mitigation at Sentencing
Even when the evidence supports a conviction, first-time status is itself a mitigating factor. Courts look at the defendant’s criminal history, the specific circumstances of the offense, and what the person did between arrest and sentencing. Voluntarily entering a treatment program before sentencing, a clean record apart from the DUI, steady employment, and family responsibilities all carry weight. For aggravated DUI, demonstrating remorse and cooperating with the victim’s restitution needs can influence whether the court imposes a sentence closer to the 30-day mandatory minimum or further up the fifteen-year range.
The Other Felony Paths Require Priors
Two other DUI felonies exist in Idaho, and neither can be charged on a first offense. A third DUI conviction (or diversion completion) within ten years becomes an automatic felony under Idaho Code 18-8005(6).2Idaho State Legislature. Idaho Code 18-8005 – Penalties A second excessive-BAC offense (0.20 or higher) within five years becomes a felony under Idaho Code 18-8004C.3Idaho State Legislature. Idaho Code 18-8004C – Excessive Alcohol Concentration If the current charge is a first DUI and no one was seriously injured, those statutes do not apply, and the case will be charged as a misdemeanor.