DWI Defense in New Jersey: What Happens After an Arrest

Is a DWI a crime in New Jersey?

No. Driving while intoxicated under N.J.S.A. 39:4-50 is a motor vehicle offense, part of the traffic code in Title 39, rather than a crime under the Criminal Code. That distinction matters less than people hope. A DWI conviction can still mean jail, the loss of your license, an ignition interlock device on your car, fines and three years of insurance surcharges, and it stays on your driving record.

Because it is a traffic offense, a DWI is heard in the municipal court for the town where the stop happened, before a municipal judge. There is no jury. The judge decides both the facts and the law, but the burden does not change: the State must prove every element of the charge beyond a reasonable doubt.

How does the State prove a DWI?

There are two routes, and prosecutors often rely on both in the same case.

• Per se, by blood alcohol concentration. A breath or blood result of 0.08% or more is enough on its own. For commercial drivers the limit is 0.04%, and drivers under 21 face a separate zero tolerance offense under N.J.S.A. 39:4-50.14 at much lower readings.
• By observation. The State can prove intoxication without any test result, using the officer's account of your driving, speech, balance and appearance, your answers to questions, and your performance on field sobriety tests. This is also how drug-impaired driving is proven, including impairment from a lawfully prescribed medication.

The State must also prove that you operated the vehicle. Usually that is not in dispute, but cases where someone was found in a parked car, or where no one saw who was driving, can turn on it.

What happens in the days after a DWI arrest?

Most people are taken to the police station, asked to give breath samples on the Alcotest, issued summonses and released. Alongside the DWI summons there are often others, such as careless or reckless driving or an open container. If the officer says you did not give breath samples, there will be a separate refusal charge; our page on refusing the breath test in New Jersey explains how that charge works.

The summonses list the municipal court and a first court date. License penalties for DWI are imposed by the judge on conviction, so in most cases you can keep driving while the case is pending.

The early weeks matter because evidence has a short life. Police video, dispatch recordings and the Alcotest's data and maintenance records are requested through discovery, and those requests should go out early. Write down what you remember while it is fresh: where you were, what and when you ate and drank, any medical conditions, and what was said during the stop.

What are the penalties for a first DWI in New Jersey?

For offenses on or after December 1, 2019, the penalties for a first offense depend mostly on your blood alcohol concentration (BAC):

• 0.08% to under 0.10%: an ignition interlock device (IID) for three months, and a fine of $250 to $400.
• 0.10% to under 0.15%: license forfeiture until an IID is installed, the IID for seven months to one year, and a fine of $300 to $500.
• 0.15% or more: license forfeiture for four to six months, with an IID during the forfeiture and for nine to fifteen months after it.

For any first offense the judge may also impose up to 30 days in jail, and you must complete 12 to 48 hours at an Intoxicated Driver Resource Center (IDRC). The Motor Vehicle Commission imposes insurance surcharges for three years, and court fees and assessments are added to the fine. A DWI in a school zone or at a school crossing carries enhanced penalties.

What if this is not my first DWI?

Second and third offenses carry mandatory jail, license loss measured in years rather than months, longer interlock periods, and higher fines and surcharges. The exact terms depend on your record and the facts, so get advice on your own situation rather than relying on a chart found online.

Time between offenses counts. If more than ten years passed between one offense and the next, a second offense can be sentenced as a first, and a third as a second. This step-down affects sentencing only; the earlier conviction remains on your record.

Where are DWI cases challenged?

Defending a DWI is mostly a close reading of what the police did and how the evidence was produced. These are the issues that come up most often. Not every one applies in every case, and none of them promises a particular result.

The stop

Police need a lawful basis to pull a car over. If the stop was not justified, the evidence gathered after it, from the officer's observations to the breath test, can be challenged in a motion to suppress. The dash camera and body camera footage often shows the driving that led to the stop.

Field sobriety tests

The walk-and-turn, one-leg stand and eye-movement tests are standardized, which means they are supposed to be explained, demonstrated and scored a particular way. Uneven ground, poor lighting, weather, footwear, injuries and nerves all affect performance. Video lets the court compare what happened with what the report says happened.

The Alcotest

In State v. Chun (2008), the New Jersey Supreme Court upheld the Alcotest as reliable, subject to conditions. One of the most important is the 20-minute observation period: the operator must watch you for 20 minutes before taking a sample, to make sure nothing, such as belching or regurgitation, could affect the result. The operator must be certified, and the instrument must have been properly calibrated and maintained.

Calibration is not a formality. In State v. Cassidy (2018), the Supreme Court held Alcotest results unreliable where the coordinator who calibrated the instruments had skipped a required step, and thousands of cases were affected. Calibration records and operator certifications are part of discovery in every breath-test case.

Blood tests

A blood draw generally requires your consent or a warrant. How a warrant was obtained, how and by whom the blood was drawn, how the sample was stored, and how the lab tested it can all matter.

Drug DWI

Where drugs are alleged, the State often relies on an officer trained in the drug recognition evaluation, known as a DRE. In State v. Olenowski (2023), the Supreme Court held that DRE testimony is admissible, subject to conditions. Whether those conditions were met, and what the toxicology actually shows, is often the center of a drug DWI case.

Discovery

The defense is entitled to the State's evidence: police reports, dash and body camera video, the Alcotest's data and reports, calibration and repair records, operator certifications and any lab results. Reviewing all of it before deciding how to plead is the starting point for every decision that follows.

Can a DWI be plea bargained, diverted or expunged?

These are the questions people most often ask, and the answers are stricter than for many other charges.

• Plea bargaining is limited. Court guidelines restrict plea agreements in DWI cases, so a DWI is not routinely negotiated down the way some other charges are.
• There is no diversion. Pretrial Intervention, conditional discharge and conditional dismissal do not apply to DWI. Our page on Pretrial Intervention and the municipal court programs explains what those programs cover.
• A conviction cannot be expunged. Motor vehicle offenses are not expungeable, so a DWI conviction stays on your driving record. The expungement section of our Knowledge Center covers what can be cleared.

That combination is why the evidence deserves a careful look before anyone pleads guilty. Entering a plea at the first court date to get it over with gives up every question about the stop, the testing and the records.

What else can a DWI affect?

The court's sentence is only part of the picture. A conviction can affect a job that involves driving, a commercial driver's license, a professional license, and your insurance costs well beyond the surcharge period. For anyone who is not a U.S. citizen, there can be immigration consequences. Tell your lawyer about any of these at the start, because they can shape how the case should be handled.

What should you do now?

• Read every summons and note the court, the date and each charge.
• Do not miss a court date. If you cannot attend, the court needs to hear from you or your lawyer beforehand.
• Do not discuss the case on social media or with anyone other than your lawyer.
• Write down your account of the night, including food, drink, medications and timing.
• Keep any receipts, texts or records that show where you were and when.
• Gather the paperwork the police gave you and keep it together.

DWI cases in Morris and Sussex County municipal courts

A DWI charge stays local. If you were stopped in Jefferson, Rockaway, Parsippany or Morristown, the case belongs to the municipal court that serves that town; the same is true in Sparta, Newton, Vernon or Hopatcong. Some towns share a joint municipal court, and each court sets its own calendar. Our pages on criminal defense in Morris County and criminal defense in Sussex County explain how cases move through each county.

Talking to a lawyer about your DWI

The right approach depends on the stop, the testing, your record and what is at stake for you outside court. A consultation is a chance to go through the summonses, understand the penalties you actually face, and decide what to look at first. Shorter answers to common questions are in the DWI section of our Criminal Defense Knowledge Center.

Gray Law Group's office is on Route 15 in Jefferson, and the firm represents people charged with DWI in municipal courts across Morris and Sussex counties and northern New Jersey. If you would like to talk through your case, you can request a consultation.