DUI Information

New Hampshire
Ignition Interlock Program

New Hampshire law requires an ignition interlock device to be installed when a person’s license has been suspended or revoked for:
1. An aggravated DWI;
2. A subsequent DWI under RSA 265-A:18
3. DWI while under the age of 21

The ignition interlock device will be required for a period of 12-24 months after the suspension ends. For operators under the age of 21, the length of period will be up until the age of 21 and a minimum of 12 months.

The New Hampshire Department of Safety is the state agency, which sets forth the rules governing the use of ignition interlock devices in NH. If you are required to install an ignition interlock device on your vehicle, you will be required to pay hefty costs associated with installation, maintenance and calibration. You will be required to blow into the machine every time you want to start your vehicle and you will be required to periodically blow into the machine in order to keep your car running. The set point for the ignition interlock device will be .02% BRAC (Breath Alcohol Content) which is roughly equivalent to 1 12oz beer.

Minimum Standards for Alcohol Ignition Interlock Devices

All approved New Hampshire ignition interlock devices shall meet or exceed the specifications set forth by the National Highway Traffic Safety Administration.

The ignition interlock device shall disable the vehicle at 0.020 percent BRAC (Breath Alcohol Content).

All alcohol ignition interlock devices shall have the following warning label:


NH Ignition interlock devices shall be calibrated and certified monthly, unless otherwise ordered by the Court.

Ignition interlock devices shall record the following data:

(1) Up to 90 days of driving activity before requiring service and/or calibration, and
(2) Records info and provides reports containing:
a. A report of all attempts (successful or unsuccessful) to start the vehicle,
b. A report of the BRAC (breath alcohol content) of the operator for each attempt;
c. A report of the rolling re-tests taken while the vehicle is being operated;
d. A log of all attempts to circumvent or avoid the taking of tests to start the vehicle and attempts to tamper with the alcohol interlock ignition device;
e. A report of the number of events in the recording system; and
f. A report of the number of engine starts.
g. No ignition interlock device shall be equipped with a bypass device.

Collection of Fees

The ignition interlock service provider shall be responsible for the collection of all fees and costs associated with providing use of the device.

Our NH DWI attorneys represent clients at courts in all New Hampshire towns and counties including: Concord, Dover, Manchester, Nashua, Salem, Rochester, Portsmouth, Plymouth, Laconia, Franklin, Exeter, Durham, Plaistow, Keene, North Conway, Ossipee, Newport, New London, Milford, Merrimack, Littleton, Lebanon, Laconia, Hillsborough, Henniker, Hampton, Hooksett, Jaffrey, Peterborough, Goffstown, Derry, Candia, Claremont, Hillsborough County, Strafford County, Rockingham County, Merrimack County, Belknap County, Carroll County, Cheshire County, Coos County, Sullivan County and Grafton County.

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