Ignition interlock devices (IIDs) are becoming more and more common in driving while intoxicated (DWI) cases in New Jersey and around the country. For a certain period of time after some DWI convictions, an individual may only operate a vehicle equipped with an IID, which requires the person to submit a breath sample and prevents the ignition key from turning if the person’s blood alcohol content (BAC) is too high. The IID requirement acts as a safeguard against drinking and driving by people with DWI convictions, while still allowing them to drive when necessary. A lawsuit against a city government demonstrates a possibly unexpected consequence of this policy: claims of negligence against cities and other local governments for failing to ensure that a person ordered to use an IID actually does so. This type of lawsuit adds a civil—as in, non-criminal—element to DWI law.
The installation of an IID is mandatory for certain DWI offenses, or it may be within a court’s discretion to order its use. Before a person may start the vehicle, they must blow into a device that, just like a breathalyzer, measures BAC levels. The maximum allowable BAC is usually less than the “legal limit” of 0.08 percent, since the point of the device is to prevent a person from driving before they near the point of legal impairment.
New Jersey’s IID law expressly acknowledges that some people with DWI convictions will continue to drive anyway. For many first DWI offenses, New Jersey judges have discretion to order the use of an IID for six months to one year after driver’s license restoration. If a first DWI involves BAC of at least 0.15 percent, however, an IID is mandatory, both during the license suspension period and for six months to a year afterwards. The penalties for a second, third, or subsequent DWI offense include mandatory IID installation during the license suspension period and for an additional one- to three-year period. A person commits a new offense if they violate an order to use an IID, and they could also face additional penalties in the underlying DWI case.