Vol. L · No. I FOL. LArticles
Avery & Avery, Esqs. Ridgefield, NJ John S. Avery, Esq.
What Are DUIs? NJ DWI Laws Explained for Lay Readers
By John S. Avery, Esq.
A DUI — driving under the influence — is the offense of operating a motor vehicle while impaired by alcohol or drugs. In NJ, the formal term is “DWI” (driving while intoxicated) under N.J.S.A. 39:4-50, but the colloquial usage is “DUI” and the meaning is the same. This post explains the basics in plain language for people who haven’t dealt with one before.
Plain-language overview. Not legal advice. Free consultation: (201) 943-2445.
What Triggers a DUI / DWI Charge
A NJ DWI charge requires three elements:
- Operation of a motor vehicle — driving, or being in sufficient physical control to operate
- On a public road or quasi-public area — not pure private property
- While impaired — either by a 0.08% BAC reading (per-se prong) or by general impairment (impairment prong)
A traffic stop, an accident scene, or even a parked-with-engine-on encounter can all lead to a DWI charge. The State’s evidence comes from officer observations, field sobriety tests, and breath / blood testing.
What’s the Difference Between Per-Se and Impairment?
Per-Se Prong
If your BAC is 0.08% or higher (0.04% for commercial drivers under N.J.S.A. 39:3-10.13), you’re guilty as a matter of law, regardless of whether you “felt” impaired or drove poorly. The breath-test or blood-test reading is the proof.
Impairment Prong
If your BAC is below 0.08% — or there’s no BAC reading at all — the State can still convict if it proves your faculties were impaired by alcohol or drugs. The proof comes from field-sobriety tests, officer observations, and (for drug DWI) Drug Recognition Expert evaluation.
What Are the Penalties?
NJ DWI penalties depend on:
- Prior-offense status — first, second, third+
- BAC level — under 0.10%, 0.10-0.15%, 0.15%+
- Date of offense — pre-2019 reform vs post-2019
- Class of vehicle — civilian vs commercial
A typical first-offense conviction at 0.08-0.10%:
- $250-$400 fine
- Up to 30 days county jail
- 3-month ignition interlock on personal vehicle
- 12-48 hours of Intoxicated Driver Resource Center
- $1,000 per year × 3 years in surcharges
- Possible insurance-premium uplift
A first-offense at 0.15%+ adds mandatory ignition interlock during license forfeiture (4-6 months) plus 9-15 months post-restoration.
A second offense adds 2-90 days county jail, 1-2 year license forfeiture, and 30 days community service.
A third offense triggers mandatory 180 days county jail with not less than 90 days served in custody.
What Are the Common Defenses?
Real defenses that work in NJ DWI practice:
Stop-Predicate Defense
The Fourth Amendment requires reasonable articulable suspicion for the stop. If the officer’s basis was insufficient, the entire case can be suppressed.
Arrest-Predicate Defense
Even if the stop was lawful, the arrest must be supported by probable cause to believe the defendant was operating while impaired. If the field-sobriety record doesn’t support probable cause, the arrest can fall.
Alcotest Foundation Defense
State v. Chun, 194 N.J. 54 (2008) sets twelve foundation requirements for Alcotest readings. Failure on any one element can suppress the BAC.
Field-Sobriety Protocol Defense
Each NHTSA-standardized test has an administration protocol. Material divergence renders the test unreliable.
Operation-Element Defense
The State must prove operation. If the defendant was sleeping in a parked car with the engine on for HVAC, operation may not be satisfied.
What About Drug DWI?
The same statute, N.J.S.A. 39:4-50, covers drug-impairment. Proof comes from Drug Recognition Expert evaluation. After State v. Olenowski, 253 N.J. 133 (2023), the State must lay a Daubert-style foundation for DRE testimony. Many drug-DWI prosecutions are litigable on foundation grounds.
What Happens If I’m Charged?
The procedural arc:
- Roadside stop and arrest
- Station processing — Alcotest, Standard Statement, booking
- Release — typically released on summons; some matters require bail
- First court date in municipal court
- Discovery period — your lawyer pulls dashcam, BWC, Alcotest records
- Pretrial conference — plea negotiation or trial preparation
- Resolution — plea, trial, or dismissal
Most matters resolve in 60-180 days.
Frequently Asked Questions
Is DUI a felony in NJ?
No. DWI in NJ is a Title 39 traffic offense, not a Title 2C indictable crime. It’s not a “felony” in the categorical sense, but it carries jail exposure and serious collateral consequences.
Will I lose my license?
It depends on prior status, BAC, and date of offense. First-offense post-2019 reform typically substitutes ignition interlock for license forfeiture as the primary sanction.
Can a DWI be expunged in NJ?
No. Title 39 traffic offenses, including DWI, are not eligible for expungement under N.J.S.A. 2C:52. The conviction stays on the driver’s abstract.
What about underage DWI?
N.J.S.A. 39:4-50.14 sets a 0.01% BAC threshold for drivers under 21. Penalty schedule is shorter than the adult statute.
Free Consultation
For NJ DWI / DUI defense:
- Call: (201) 943-2445
- Office: 559 Bergen Boulevard, 2nd Floor, Ridgefield, NJ 07657
- Online: Free consultation request