New Jersey law imposes numerous penalties for driving while intoxicated (DWI). A conviction can result in fines, jail time, and driver’s license suspension. New Jersey no longer imposes an automatic license suspension after a DWI arrest, unless it’s a drug-based offense, or there is a conviction for refusal to submit to breath testing. The length of a driver’s license suspension after a DWI conviction depends on a person’s blood alcohol concentration (BAC) and the number of prior DWI convictions. A driver convicted of DWI in New Jersey must install an ignition interlock device (IID) in their vehicle. A law that took effect in New Jersey in 2025 allows many people to reduce the length of their license suspension based on how long they have an IID installed in their vehicle. It is informally known as the “2 for 1 law,” because it reduces the driver’s license suspension period by one day for every two days a person has an IID in their vehicle.
What Is an Ignition Interlock Device?
An IID is a device that attaches to a motor vehicle’s steering column. It is essentially a breathalyzer that prevents the vehicle from starting if the driver’s BAC is over a certain amount. For people with DWI convictions, the BAC threshold is less than the “legal limit” of 0.08 percent.
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