NH DWI statute (RSA 265-A:2) — regular vs. Aggravated DWI, 1st/2nd/3rd offense penalties, 10-year look-back, felony DWI, and the zero tolerance rule for under-21 drivers (RSA 265-A:14)

New Hampshire DWI criminal penalties: (1) NH DWI scope — RSA 265-A:2: a person is guilty of DWI in NH if they drive or attempt to drive: (a) with a BAC of 0.08% or higher (per-se standard); (b) while impaired by any drug (controlled substance, prescription medication, or intoxicant) that impairs the ability to drive; or (c) with BAC of 0.08% or higher combined with any measurable amount of a controlled drug. DWI covers both alcohol impairment and drug impairment (including opioids — highly relevant given NH's fentanyl crisis); (2) First offense DWI — Class B misdemeanor (RSA 265-A:18(I)): $500-$1,200 fine; 9-month license suspension; mandatory participation in the Impaired Driver Assistance and Referral Program (IDARP); no mandatory jail time (but court may impose up to 1-year imprisonment — the Class B misdemeanor maximum includes no imprisonment but court discretion exists through alternative sentencing); (3) Aggravated DWI (RSA 265-A:3) — 1st offense aggravated: Class A misdemeanor (higher than regular 1st DWI). Aggravating circumstances: BAC ≥ 0.16% (double the legal limit); driving 30+ mph over the speed limit while DWI; causing an accident with serious bodily injury; or transporting a person under 16 while DWI. Aggravated DWI 1st offense: mandatory 17.5-day incarceration (7 days in jail + 10.5 days residential program); $750 minimum fine; 18-month license revocation; (4) Second DWI offense within 10 years — Class A misdemeanor: 5 days to 1 year incarceration (mandatory minimum 5 days; may be served as intensive supervision program or residential DWI program); $750 minimum fine; 3-year license revocation; mandatory IID installation for reinstatement; (5) Third DWI offense within 10 years — CLASS B FELONY (RSA 265-A:18(III)): 180 days to 7 years imprisonment (7 years = Class B felony max; mandatory minimum 180 days incarceration); $750 minimum fine; indefinite license revocation; mandatory IID; (6) Under-21 DWI zero tolerance — RSA 265-A:14: drivers under 21 with BAC ≥ 0.02% are guilty of a separate offense — DUI under 21 zero tolerance. Penalties: fine; license suspension. Full DWI charges apply if the under-21 driver's BAC is ≥ 0.08%; (7) 10-year look-back: RSA 265-A:18 uses a 10-year look-back for enhancement — prior DWI convictions within 10 years before the current DWI arrest count for enhancement purposes.

NH DMV ALS (Administrative License Suspension) — the 30-day hearing request deadline, refusal consequences, IDARP program, and IID (Ignition Interlock Device) requirements

New Hampshire administrative license suspension: (1) NH DMV ALS system: upon a DWI arrest in New Hampshire, the arresting officer submits a report to the NH Division of Motor Vehicles (DMV) if: (a) the driver takes the breath test and the result is BAC ≥ 0.08% (or ≥ 0.02% for under-21 drivers); OR (b) the driver refuses to submit to chemical testing (implied consent refusal). The NH DMV then initiates an administrative license suspension separate from the criminal DWI case; (2) 30-day hearing request deadline: the driver has 30 days from the date of the notice of suspension to request an administrative hearing with the NH DMV Bureau of Hearings. The request must be submitted in writing within this 30-day window. If no hearing is requested within 30 days, the suspension becomes effective automatically. The 30-day deadline is significantly more forgiving than Hawaii's 6-day ADLRO deadline but requires timely action; (3) ALS suspension periods in NH: First offense, BAC ≥ 0.08%: 6-month suspension. First offense, refusal to test (implied consent refusal): 6-month suspension (same as BAC ≥ 0.08% for first offense — unlike many states where refusal carries a longer suspension). Second offense, BAC ≥ 0.08%: 2-year suspension. Second offense, refusal: 2-year suspension. Third offense: suspension matches the criminal revocation period; (4) IDARP — NH Impaired Driver Assistance and Referral Program: mandatory for first DWI offenders in NH. IDARP is a substance abuse assessment and referral program administered through NH DHHS (Department of Health and Human Services)-certified providers. After a DWI conviction, the offender undergoes a substance abuse evaluation and any recommended treatment referral. Successful IDARP completion is a condition for license reinstatement. IDARP can include an outpatient counseling program or a residential DWI program depending on assessment results; (5) IID — Ignition Interlock Device: NH mandates IID installation as a condition of license reinstatement after certain DWI convictions. IID is required for: second or subsequent DWI conviction; any aggravated DWI conviction; and conviction under certain DWI-related statutes. The IID requires a valid breath sample before the vehicle starts and at intervals during operation. NH DMV approves IID vendors and oversees the program.

NH implied consent (RSA 265-A:4), DWI enforcement in Manchester and Laconia Motorcycle Week, commercial driver DWI (CDL impact), and winter road condition DWI defenses

New Hampshire DWI enforcement and defense contexts: (1) NH implied consent — RSA 265-A:4: all persons who operate a vehicle in NH implicitly consent to submit to a chemical test to determine intoxicant or controlled drug content if lawfully arrested for DWI. The arresting officer must advise the driver of the implied consent warning (the consequences of refusal) before requesting the test. Consequences of refusing: (a) 6-month license suspension (administrative — same as test-result suspension for first offense in NH, unlike some states where refusal suspension is longer); (b) refusal admissible in the criminal DWI case as evidence of consciousness of guilt; (c) the prosecution may obtain a search warrant for a blood draw over the driver's refusal in circumstances where exigent circumstances or a court order supports the blood draw; (2) NH breath testing equipment: NH uses the Intoxilyzer 5000EN (an older model that has been phased out in many states but continues to be used in NH alongside more modern equipment at certain locations) and the Datamaster DMT. Defense attorneys challenge the specific instruments on calibration records, maintenance history, and operator certification; (3) Manchester DWI enforcement: Manchester (Hillsborough County) — NH's largest city with the state's most active criminal docket — has concentrated DWI enforcement through the Manchester Police Department (MPD) DWI Unit and NH State Police Troop B (Manchester barracks). The Elm Street corridor (Manchester's downtown bar district) and the various restaurants and entertainment venues along South Willow Street generate DWI arrests throughout the year; (4) Laconia Motorcycle Week DWI enforcement: the Laconia Motorcycle Week (held annually in June in the Lakes Region — centered in Laconia, Weirs Beach, and Loudon/New Hampshire Motor Speedway; the oldest motorcycle rally in the US) brings an estimated 200,000-300,000 motorcycle riders to the Belknap County area for one week. NH State Police, Laconia PD, and surrounding municipal agencies conduct intensive DWI enforcement during Motorcycle Week. DWI arrests during Laconia Motorcycle Week are a significant annual component of NH's motorcycle DWI enforcement; (5) Winter road conditions as a DWI defense element: NH's severe winter weather (ice, snow, black ice) creates a DWI defense context where a defendant may argue that erratic driving observed by a police officer (the basis for the traffic stop) was caused by road conditions rather than impairment. NH defense attorneys regularly challenge the officer's basis for the stop (reasonable suspicion of DWI) by presenting evidence of road conditions at the time and location of the stop. NH State Police Troop F (North Country/Troop G Concord area) generates winter DWI enforcement on I-89, I-93, and the White Mountains corridors where weather conditions are relevant to the initial stop analysis.

DUI & Traffic Laws in New Hampshire (2026)

New Hampshire DUI & Traffic Violations: what to handle first around dashcam preservation, BMV notice handling, and timing

A more editor-shaped dui & traffic violations guide for New Hampshire that keeps the early sequence that protects options, document control, and realistic next-step pressure in view.

Reviewed January 2026 2 min read Official-source grounded Ver en Espanol En Español

Key Takeaways

NH DWI (RSA 265-A:2): "Driving While Intoxicated" (NH terminology for DUI). Scope: BAC ≥0.08% per se OR impairment by drug/controlled substance/intoxicant + BAC ≥0.08% combined with any controlled drug. CDL: 0.04% BAC. Under-21 zero tolerance: 0.02% BAC (RSA 265-A:14; separate offense). 10-year look-back (RSA 265-A:18) for enhancement. 1st offense (regular DWI): Class B MISDEMEANOR; $500-$1,200 fine; 9-month license suspension; mandatory IDARP (Impaired Driver Assistance and Referral Program). AGGRAVATED DWI 1st offense (RSA 265-A:3; BAC ≥0.16% OR driving 30+mph over limit while DWI OR accident with serious bodily injury OR transporting person <16): Class A MISDEMEANOR; mandatory 17.5-day incarceration (7 days jail + 10.5 days residential program) + $750 min fine + 18-mo revocation. 2nd offense within 10yr: Class A MISDEMEANOR; mandatory 5 days to 1yr incarceration + $750 min + 3-yr revocation + mandatory IID. 3rd offense within 10yr: CLASS B FELONY; 180 days to 7yr imprisonment + $750 min + indefinite revocation + IID.
NH DMV ALS: 30-DAY HEARING REQUEST DEADLINE from notice of suspension (write to NH DMV Bureau of Hearings within 30 days or suspension becomes final). More generous than HI's 6-day deadline but requires timely action. ALS suspension periods: 1st offense BAC ≥0.08% = 6-month suspension; 1st offense REFUSAL = 6-month suspension (SAME as test-result for 1st offense — NH doesn't add extra penalty for refusal in 1st offense revocation duration unlike many states). 2nd offense: 2-year suspension (test or refusal). Implied consent (RSA 265-A:4): officer must advise of consequences BEFORE requesting test. Refusal consequences: 6-mo ALS + admissible as consciousness of guilt in criminal case + possible search warrant blood draw over refusal. NH breath testing: Intoxilyzer 5000EN + Datamaster DMT; defense challenges on calibration records + maintenance history + operator certification. IDARP: substance abuse assessment + referral through NH DHHS-certified providers; mandatory for 1st DWI offenders; outpatient counseling or residential DWI program; completion required for license reinstatement. IID: mandatory for 2nd+ DWI or aggravated DWI convictions as reinstatement condition.
Manchester DWI enforcement: Manchester Police DWI Unit + NH State Police Troop B (Manchester barracks); Elm Street downtown bar district + South Willow Street restaurant/entertainment venues. LACONIA MOTORCYCLE WEEK (annually June; Laconia/Weirs Beach/Loudon; oldest US motorcycle rally; 200K-300K riders; Belknap County area): NH State Police + Laconia PD + surrounding agencies = intensive DWI enforcement; significant annual NH motorcycle DWI arrest volume. Winter road condition DWI defense: erratic driving basis for stop may be challenged when black ice/snow/ice conditions explain swerving or lane deviation at time/location of stop; NH State Police Troops F + G (North Country/Concord) generate winter DWI enforcement on I-89/I-93/White Mountains corridors where weather conditions are active defense element. Commercial driver: CDL 0.04% BAC; DWI conviction = mandatory CDL disqualification (federal CDL regulations; 49 CFR Part 383); second CDL DWI = lifetime CDL disqualification; serious career consequence for NH commercial truck drivers.

Key Numbers — New Hampshire All 50 states →

Filing Deadline 3 years

Fault Rule Modified Comparative

Insurance System At-Fault

Key Statute RSA § 508:4

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New Hampshire's DUI law is labeled "DWI" — Driving While Intoxicated — under RSA 265-A:2, a statutory terminology that reflects the state's traditional criminal law vocabulary. The per-se BAC threshold is 0.08% for adults 21 and older, 0.04% for commercial drivers operating CDL vehicles, and 0.02% (zero tolerance) for drivers under 21 under RSA 265-A:14. New Hampshire's DWI enhancement uses a 10-year look-back period (RSA 265-A:18) — a prior DWI conviction within the preceding 10 years elevates a new arrest from first to second offense, or from second to third (felony) offense. The most significant NH DWI innovation is the "Aggravated DWI" category (RSA 265-A:3) — an enhanced first-offense DWI charge that is a Class A misdemeanor (rather than Class B) when certain aggravating circumstances are present: BAC of 0.16% or higher; driving 30 or more miles per hour over the posted speed limit while intoxicated; causing an accident involving serious bodily injury; or transporting a person under 16 years of age while intoxicated.

New Hampshire's administrative license suspension (ALS) system is administered by the NH Division of Motor Vehicles (DMV; Concord) — separate from the criminal DWI proceedings in District Court or Superior Court. Upon a DWI arrest where the driver takes the breath test and records a BAC of 0.08% or higher, or where the driver refuses the chemical test, the NH DMV initiates an administrative suspension of the driver's license. Defendants have 30 days from the notice of suspension to request an administrative hearing with the DMV's Bureau of Hearings. Missing the 30-day deadline results in the suspension becoming final. In the context of NH's optional insurance law (discussed in the car accidents section), DWI cases involving uninsured drivers create compounded legal problems for accident victims — civil liability; criminal prosecution; and administrative license action converge on an uninsured at-fault driver in ways that make recovery particularly complex.

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