Interlock System Laws in New Hampshire


Ignition Interlock Devices (IID) in New Hampshire

     An Ignition Interlock Device (IID) is a small mechanical device that can record the blood alcohol content of a driver. The IID is usually installed on the dash of the vehicle and connected to the vehicle's starter system. Before starting the car, the driver must blow 1.5 liters of air into the device. The IID will then measure the blood alcohol content of the driver. If the measured blood alcohol content level is higher than the level set by the court, the vehicle will not start. For additional information regarding IIDs in New Hampshire, contact us.

Who Is Required to Have an IID Installed?

     IIDs are yet another collateral consequence of DUI convictions. In New Hampshire, persons convicted of the following offenses are required to have an IID installed in their vehicle:

  • Aggravated DUI;
  • Persons who have been arrested for driving under a suspended or revoked license resulting from a prior DUI charge;
  • Persons who have been convicted of multiple DUI offenses; and
  • Persons who have multiple alcohol related convictions on their driving record.

     New Hampshire law also allows but does not require courts to require drivers under the age of 21 who have been convicted of DUI offenses to have an IID device installed in their vehicle. The decision as to whether to require the installation of an IID in these cases is left to the discretion of the court. If you have questions concerning IID installation requirements, contact us.

How Does IID Installation Work?

     IID devices are not installed in vehicles until after the license or suspension time period has been completed. Once a driver has his or her license reinstated, the IID will be installed by an interlock system service provider. If you are required to have an IID, you must make sure that a device is installed on every vehicle that is registered in your name.

How Long Do I Have to Keep an IID Installed in my Vehicle?

     The decision as to how long a driver will be forced to keep the IID in the vehicle is left to the discretion of the judge. The law permits the judge to order a time period not less than one year and not to exceed two years. For persons who are under the age of 21, the judge can require that the IID remain installed in the vehicle for at least one year or until the person reaches the age of 21, whichever comes first.

We Can Help

     Once you have an IID device installed in your car, you are required by law to abide by the terms set by the court. Failure to do so can result in your being charged with a misdemeanor. If you have been charged with a DUI, the time to defend yourself is at the outset. You need to hire an experienced lawyer to represent you in your proceeding. We will provide you with a skilled, competent defense that may lead to the prosecution dropping or reducing the charge against you.

Contact a DWI Attorney Today

     If you have been charged with a DUI, call the Law Office of Chadwick-Fricano-Weber to schedule an initial consultation. We have represented clients in a number of DUI cases and have the knowledge and experience needed to provide you with a competent defense. Call us at (603) 880-6100 today.