If you are convicted of drunk driving in New Jersey, you will almost certainly need to install an ignition interlock device in your vehicle. The state requires IID installation for virtually all drunk driving convictions, including first offenses. However, the length of time you need the device depends on your blood alcohol concentration and whether you refused a breath test.
At The Kugel Law Firm, our New Jersey drunk driving defense attorneys can help drivers throughout Jersey City, Hudson County, and the surrounding areas understand their IID obligations. Rachel Kugel has represented clients facing DWI charges in courts across the state, including the Jersey City Municipal Court at the Lewis S. McRae Justice Complex. We know how disruptive an interlock requirement can be, and we can work to minimize its impact on your life.
This guide explains when New Jersey requires an IID, how long you must keep the device, what violations can extend your requirement, and how to have the device removed. Contact The Kugel Law Firm today at (973) 854-0098 for clear guidance on managing your IID requirements.
What Is an Ignition Interlock Device?
An ignition interlock device is a breath-testing unit wired into your vehicle’s ignition system. Before you can start your car, you must blow into the device and register a blood alcohol concentration below 0.05%. If your breath sample exceeds this limit, the vehicle will not start.
The device is roughly the size of a smartphone and connects to your steering column through certified installation. Once your car is running, you must also provide “rolling retests” at random intervals while driving. These periodic tests ensure you remain sober throughout your trip, not just when you first get behind the wheel.
If you fail a rolling retest, the device will not shut off your engine while you are driving. Instead, it will trigger your horn and flash your lights to alert other drivers and law enforcement. The device also records every test result, and this data is reported to the New Jersey Motor Vehicle Commission (NJMVC) during mandatory calibration appointments.
Does New Jersey Require an IID for All DWI Convictions?
Since December 2019, New Jersey law requires ignition interlock devices for all DWI and breath test refusal convictions under N.J.S.A. 39:4-50.17. This includes first-time offenders, which was not always the case under prior law. The specific duration depends on your BAC level and offense history.
For a first DWI offense, the required IID period varies based on your blood alcohol concentration at the time of arrest. If your BAC was between 0.08% and 0.10%, you must have the device installed for three months. A BAC between 0.10% and 0.15% requires installation for nine to fifteen months. If your BAC was 0.15% or higher, the device must remain installed during your license suspension period plus an additional twelve to fifteen months after your driving privileges are restored.
The penalties increase significantly for repeat offenders. A second DWI conviction requires IID installation for two to four years following restoration of your license. Third and subsequent offenses also carry a two- to four-year interlock requirement, in addition to the mandatory 180-day jail sentence and eight-year license suspension.
New Jersey DUI Lawyer. The Kugel Law Firm
Rachel Kugel
Rachel Kugel is the founder of the Kugel Law Firm and a dedicated New Jersey DWI defense attorney who focuses exclusively on defending people charged with drunk or impaired driving. With hundreds of DWI/DUI cases handled across New Jersey and New York, Rachel remains at the forefront of DWI defense strategies as a member of the National College of DWI Defense and the DUI Defense Lawyers Association.
Recognized as a trusted authority in DUI defense, Rachel has been invited to speak by AVVO “Lawyernomics,” the New Jersey Bar Association, and Garden State CLE. She has been featured as a legal specialist on CNN, FOX News, CourtTV, MSNBC, and HLN. The Kugel Law Firm holds an AVVO rating and was named a Rising Star SuperLawyer for three consecutive years, giving clients confidence that they are choosing an experienced advocate who will fight for their rights and hold the State accountable.
What Happens If You Refuse a Breath Test?
Refusing to submit to a breath test triggers separate IID requirements under N.J.S.A. 39:4-50.4a. New Jersey treats refusal as a serious offense because it undermines the state’s ability to enforce drunk driving laws. In many cases, refusal penalties are actually harsher than the penalties for a DWI conviction itself.
A first refusal requires IID installation for six to twelve months. This is significantly longer than the three-month requirement for a first DWI with a low BAC. A second refusal requires the device for one to three years, plus a two-year license suspension. A third refusal carries a one to three year IID requirement plus a ten-year license forfeiture.
These refusal penalties apply in addition to any penalties from an underlying drunk driving charge. If you both refuse the breath test and are convicted of driving while intoxicated based on other evidence, you face consequences for both offenses. Drivers should understand that refusing the test will not help them avoid an interlock requirement.
Can You Install an IID Voluntarily Before Conviction?
Yes, and doing so can reduce your overall penalty. Under a law that took effect in 2025, drivers arrested for drunk driving can voluntarily install an IID before their case is resolved. This proactive step demonstrates responsibility and allows you to keep driving while your case proceeds through the Hudson County Superior Court at 583 Newark Avenue.
First-time offenders who voluntarily install the device receive “2-for-1” credit toward their required IID period. For every two days that a compliant IID is installed pre-conviction, a driver earns one day of credit against their eventual license forfeiture.
To take advantage of this program, you must have possessed a valid New Jersey driver’s license in good standing at the time of your arrest. You must also maintain that good standing throughout your court proceedings. The NJMVC will issue a special license notation indicating you are authorized to drive only vehicles equipped with an IID.
Key Takeaway: New Jersey drivers arrested for DWI can voluntarily install an IID before conviction to keep driving while their case proceeds. First-time offenders earn “2-for-1” credit: every two days with a compliant device reduces the post-conviction IID period by one day.
How Much Does an Ignition Interlock Device Cost?
You are responsible for all costs associated with your IID, including installation, monthly leasing fees, calibration, and removal. The NJMVC requires you to use a state-certified vendor, and prices vary between providers and vehicles.
Installation typically costs between $70 and $150 depending on your vehicle. Monthly leasing fees generally range from $50 to $100. You must also bring the device in for calibration and data download every 60 days, and some vendors charge additional fees for these service appointments.
New Jersey does offer financial assistance for drivers who cannot afford the full cost. Under N.J.S.A. 39:4-50.17a, if your family income does not exceed 100% of the federal poverty level, your monthly leasing fee is reduced by 50%. Drivers with income up to 149% of the poverty level pay 75% of the standard fee. Those who qualify for reduced fees are also exempt from installation, calibration, monitoring, and removal charges.
What Happens If Someone Else Provides a Breath Sample Into Your IID?
Having another person provide a breath sample for your IID is a violation of N.J.S.A. 39:4-50.17. Both you and the person who blows into the device can be prosecuted for a disorderly persons offense. This carries penalties of up to $1,000 in fines and six months in jail.
Modern IIDs are designed to prevent this kind of circumvention. Many devices now include cameras that photograph the person providing each breath sample. These images are stored with your test data and transmitted to the monitoring authority during calibration appointments. If the photos show someone other than the registered driver, you may face additional legal consequences.
Tampering with the device in any way is also a criminal offense. This includes attempting to disable the device, bypass the ignition connection, or manipulate the breath sensor. The NJMVC monitors for signs of tampering during required service appointments, and any suspicious activity is reported to law enforcement. A tampering conviction results in one year of additional license suspension on top of any existing penalties.
Can You Drive a Different Car With an IID Requirement?
If your license requires an IID, you cannot legally drive any vehicle that does not have the device installed. The NJMVC prints a notation directly on your driver’s license stating this restriction, and law enforcement can verify your IID requirement during any traffic stop.
This restriction applies to all vehicles, including those belonging to your employer, family members, or friends. If you need to drive another vehicle regularly, that car must also have an IID installed. The only exception to this rule is if you do not own, lease, or have access to any vehicle. In that case, you must attest to this fact under penalty of perjury, and your license forfeiture period will equal your required IID installation period.
Driving a vehicle without an IID while your license carries the interlock restriction results in an additional one-year license suspension. An experienced attorney at The Kugel Law Firm can help you understand exactly how this requirement affects your daily transportation needs and whether any vehicle you use requires device installation.
When Can You Get Your IID Removed?
Getting your IID removed requires certification from your vendor and approval from the NJMVC. The process is not automatic, and you must demonstrate compliance with all program requirements before the device can be taken out of your vehicle.
Your IID vendor must certify that during the final 30 days of your installation period, you did not fail more than one breath test with a BAC of 0.08% or higher. If you did fail a test, a passing retest within five minutes can cure that failure. The vendor must also confirm that you complied with all maintenance, calibration, monitoring, and inspection requirements throughout your installation period.
If the vendor cannot issue this certification due to two or more violations in your final 30 days, they will report this to the NJMVC and the court. The court then decides whether to extend your IID requirement by up to 90 days. If your vehicle is sold, totaled, or impounded before your IID period ends, you must notify the NJMVC immediately and have the device professionally removed. Any new vehicle you obtain must have an IID installed to complete your requirement.
| Topic | Details |
|---|---|
| Duration of IID Requirement in New Jersey | 3 months to 15 months |
| Interlock Device Exemption | Few exceptions. Ignition interlock devices are generally required for all DUI offenders in New Jersey. |
| Driving a Different Car with IID | Not allowed. It is illegal to drive any vehicle without an IID installed as long as your license requires its use. Tampering with the device or driving another car without an IID can result in license suspension. |
Protect Your Driving Privileges With The Kugel Law Firm
A drunk driving conviction affects far more than just your driving privileges. Between the IID requirement, IDRC attendance, license suspension, fines, and insurance surcharges, the consequences can follow you for years. An experienced defense attorney can challenge the evidence against you and work to minimize these impacts on your life.
Rachel Kugel has helped clients throughout New Jersey and Hudson County defend against drunk driving charges. Our team at The Kugel Law Firm understands the technical defenses available in driving while intoxicated cases, from challenging the accuracy of breath test devices to questioning whether police had probable cause for the traffic stop. We can also help clients address IID requirements and work toward the shortest possible installation period.
Call The Kugel Law Firm today at (973) 854-0098 to schedule a consultation.
