DUI vs DWI in NJ — What the Statute Actually Says

By John S. Avery, Esq.

Search “DUI vs DWI” and you will find a thicket of state-by-state explainers, some accurate and many not. The short answer for New Jersey: NJ statute uses DWI exclusively. There is no separate “DUI” offense in New Jersey law. The two terms — “Driving Under the Influence” (DUI) and “Driving While Intoxicated” (DWI) — refer to the same NJ offense under N.J.S.A. 39:4-50.

The terminology question is mostly cultural. In other states, “DUI” is the formal statutory term; in NJ, “DWI” is the formal statutory term. Anyone who tells you that NJ has separate DUI and DWI charges with different penalties is wrong about NJ law.

This post walks through the actual NJ statute, what behavior it prohibits, the BAC tiers, the penalties, and the recurring defenses.

This is general legal information, not legal advice for any specific matter. For a free first consultation on an actual NJ DWI matter, call (201) 943-2445.

What N.J.S.A. 39:4-50 Actually Prohibits

NJ’s primary DWI statute, N.J.S.A. 39:4-50, makes it unlawful to operate a motor vehicle:

• While under the influence of intoxicating liquor, narcotic, hallucinogenic, or habit-producing drug; OR
• With a blood alcohol concentration (BAC) of 0.08% or more

The statute applies on any public road, highway, or quasi-public area open to the public. State v. Garbin, 325 N.J. Super. 521 (App. Div. 1999) confirms that “quasi-public” includes private parking lots open to public use.

There are two ways to violate the statute. The observation track (“under the influence”) requires the State to prove impairment as observed by the arresting officer — typically through field sobriety tests, demeanor, driving behavior, and dispatcher recordings. The per se track (0.08% BAC or above) requires only a valid Alcotest reading at or above the threshold. Per State v. Tischio, 107 N.J. 504 (1987), the per se reading is itself the offense — the State does not need to additionally prove that the driver was impaired in fact.

The NJ BAC Thresholds

NJ has three BAC thresholds depending on the driver:

Threshold	Driver	Statute
0.02%	Driver under 21	N.J.S.A. 39:4-50.14 (underage / “Baby DUI”)
0.04%	CDL holder operating a commercial vehicle	N.J.S.A. 39:3-10.13
0.08%	Standard adult driver	N.J.S.A. 39:4-50

A CDL holder driving a personal (non-commercial) vehicle is held to the standard 0.08% threshold for that vehicle, but a CDL DWI conviction at any BAC tier triggers federal disqualification exposure.

First-Offense Penalties (Modern Schedule)

The December 2019 reform (P.L. 2019, c.248) replaced mandatory license suspension with ignition interlock for many first offenses. The current first-offense schedule:

BAC	Fine	Jail	License/IID
0.08% to <0.10%	$250-$400	Up to 30 days	IID 3 months on personal vehicle
0.10% to <0.15%	$300-$500	Up to 30 days	License forfeit OR IID 7-12 months in lieu
0.15%+	$300-$500	Up to 30 days	Forfeit 4-6 months + IID 9-15 months post-restoration

All first offenses additionally carry the IDRC (Intoxicated Driver Resource Center) program (12-48 hours) and DWI surcharges of $1,000/year for three years.

Multi-Offense Penalties

Offense	Fine	Jail	License	IID
Second	$500-$1,000	2-90 days	1-2 years	Yes
Third+	$1,000	180 days mandatory	8 years	Yes

A third-offense DWI carries a mandatory minimum of 180 days jail, with no fewer than 90 days served in custody.

Refusal — N.J.S.A. 39:4-50.4a

NJ has implied consent under N.J.S.A. 39:4-50.2 — driving on NJ roads is statutory consent to a chemical breath test on lawful arrest. Refusal under N.J.S.A. 39:4-50.4a is a separate offense with its own penalty schedule. First refusal: $300-$500 fine, IID 9-15 months, IDRC, and the same surcharges as first DWI.

A standard refusal-defense angle runs through State v. Marquez, 202 N.J. 485 (2010) and State v. Spell, 196 N.J. 537 (2008): the officer must read the Standard Statement verbatim and in a language the defendant understands. A Standard Statement deficiency can defeat a refusal conviction.

Common DWI Defense Angles

The recurring NJ DWI defense angles are:

1. Probable cause for the stop

Under Terry v. Ohio, 392 U.S. 1 (1968) and State v. Locurto, 157 N.J. 463 (1999), the stop requires articulable reasonable suspicion. Where dash-cam, body-cam, or dispatch tape shows the stop was based on something other than the lawful predicate the officer claims, the stop is unconstitutional and any DWI evidence flowing from it can be suppressed.

2. The 20-minute observation rule

Per State v. Chun, 194 N.J. 54 (2008), the operator must observe the defendant continuously for 20 minutes before the Alcotest reading. Mouth alcohol, burping, foreign substances, or breaks in observation void the reading.

3. Alcotest 7110 foundation

The 12-step Chun foundation: calibration current, AIR printout with operator signature, .xml download, two breath samples within tolerance. Any missing element renders the reading inadmissible.

4. Field sobriety test administration

Per State v. Stever, 107 N.J. 543 (1987), HGN, walk-and-turn, and one-leg-stand have NHTSA standardized administration. Deviation supports challenge.

5. Operation element

Per State v. Daly, 64 N.J. 122 (1973), defendant in driver’s seat with engine off and keys in pocket = not “operating.” The operation analysis is fact-specific.

NJ Surcharges — Beyond the Headline

The headline penalty is rarely the real cost. Surcharges under N.J.S.A. 17:29A-35 add $1,000/year for three years on top of the fine. Insurance typically re-rates at the next renewal cycle — carriers can charge multiple-thousand-dollar premium uplifts for 3-year SR-22-like compliance windows. Ignition interlock costs real money to install and maintain. MVC restoration fees apply on license forfeiture matters. Read our blog post on NJ DMV surcharges →

Can a DWI Be Expunged in NJ?

No. NJ DWI is treated as a traffic offense for purposes of the expungement statute, but N.J.S.A. 2C:52-28 specifically excludes DWI from expungement. A first-offense DWI conviction posts to the NJ MVC abstract permanently and is visible on insurance and employment background checks.

Frequently Asked Questions

Is “DUI” a separate charge in NJ from “DWI”?

No. NJ statute uses DWI. The two terms refer to the same offense.

Why do people say “DUI” if NJ uses “DWI”?

Cultural carryover from other states. National media, federal agencies, and many other-state statutes use DUI. The terms are interchangeable in everyday speech.

What’s the BAC threshold for NJ DWI?

0.08% for standard drivers; 0.04% for CDL holders driving commercial vehicles; 0.02% for drivers under 21.

Can I refuse the breath test in NJ?

Yes, but you face a separate refusal charge under N.J.S.A. 39:4-50.4a with its own penalty schedule. Refusal is generally not a strategic win — the penalties for refusal alone are similar in magnitude to first-offense DWI penalties.

How long does a NJ DWI stay on my record?

Permanently. NJ DWI is not expungeable.

What happens if I refuse to take the Alcotest?

Same penalty range as first-offense DWI plus the refusal charge itself. NJ Standard Statement requirements (read verbatim, in language understood) provide a narrow set of defenses, but refusing without those defenses generally produces conviction.

Schedule a Free Consultation

For a free first consultation on a NJ DWI matter, call (201) 943-2445 or submit through the form. For deeper background see our DWI practice page and John S. Avery’s bio.