New Hampshire DWI: Ignition Interlock

Last reviewed: 2026-07-17

IID mandatory for aggravated and repeat DWI (12 months–2 years after the revocation period); tied to the IDCMP reinstatement process.

By offense

• First offense: IID not required at this level — IID mandatory for aggravated (12–24 months after suspension) and repeat offenses.
• Second offense: IID required
• Third offense: IID required

Statute: N.H. RSA 265-A:36