Found Guilty of DWI in New Hampshire and Ordered to Install an Ignition Interlock Device? What to Expect Now.
If you have been convicted of DWI in New Hampshire and the court or DMV has ordered an ignition interlock device, you are required to install one before you can legally drive. These devices are also known as an IID, breath alcohol ignition interlock device (BAIID), car breathalyzer, alcohol interlock, vehicle interlock, sobriety interlock, or simply “the interlock.”Here is a practical FAQ on what happens next.
What is an ignition interlock device?
It is a breath-testing unit connected to your vehicle's ignition. You must provide a breath sample before the car starts and during random rolling retests while driving. If your BAC exceeds the limit (typically greater than .025 in New Hampshire), the vehicle will not start.
Official NH information: NH DMV Ignition Interlock Program. Governing law: NH RSA 265-A:36–38 and Saf-C 6500.
How do I get one installed in New Hampshire?
You must use an NH-approved provider. One of the major approved companies is Intoxalock. Intoxalock maintains numerous service centers and partner installation locations across New Hampshire (including areas such as Manchester, Nashua, Ossipee, and others).
- Find a location near you and schedule installation: Intoxalock New Hampshire locations
- Or call an Intoxalock State Specialist at 844-899-6211
What should I expect in the first 30–90 days?
A documented learning curve is common. Many drivers record early failed tests or procedural errors while mastering the exact breath sequence and performing rolling retests, especially in traffic. Residual mouth alcohol from mouthwash, energy drinks, or certain foods can also cause temporary elevated readings that often clear on a quick retest. Research consistently shows higher failure rates in the first months that decline as users adapt.
What counts as a violation?
Events that may trigger a hearing include BAC greater than .025, missed retests, camera obstruction, or suspected tampering/circumvention. These can result in an extension of the interlock period (up to one year per occurrence) or license suspension (up to 12 months) under RSA 265-A:37 and :38. You will receive a Notice of Hearing from the Bureau of Hearings. You have the right to appear, present evidence, and be represented by counsel. The standard of proof the DMV Hearings Officer uses to determine any violation(s) is preponderance of the evidence (the lowest standard of proof). Winning your argument is a tough hill to climb. It may be best to hire an attorney to represent you because the DMV can extend your time with the device for a year or more. An experienced attorney may be able to convince the Hearings Officer to cut you a break based on a slew of arguments the attorney may have in his bag of experience.
Written continuance requests for good cause (medical treatment, etc.) must be received at least five days before the hearing.
How long will the device stay on my vehicle?
The initial period is set by the court or DMV (commonly 6–24 months). Clean compliance allows removal after the required time. Violations can extend the requirement.
Can the device produce false positives?
Yes. Mouthwash, breath sprays, some medications, energy drinks, and certain health conditions are known temporary triggers. Manufacturers such as Intoxalock publish guidance on contaminants. Rapid retests returning to .000, contemporaneous notes, and supporting records can be important evidence at a hearing.Practical tips
- Practice the breath sequence until it is automatic.
- Avoid eating, drinking, or using mouthwash immediately before a test.
- Keep the camera unobstructed.
- Pull over safely for rolling retests when possible.
- Attend all calibrations on time and keep detailed records of unusual events.
Interlock cases often involve technical logs, hearings, continuances, and medical or employment conflicts. An experienced New Hampshire attorney can review your specific notices, prepare evidence, and represent you before the Bureau of Hearings.Contact Attorney Joseph Kelly Levasseur for guidance on your ignition interlock matter.
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Tags: ignition interlock device, IID, BAIID, car breathalyzer, alcohol interlock, sobriety interlock, vehicle interlock, Intoxalock New Hampshire, NH interlock installation, New Hampshire DWI, interlock violations NH, Bureau of Hearings, RSA 265-A, DWI consequences New Hampshire
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