New Mexico DWI Laws Explained

By Javier Marín, Editor·Last reviewed September 2026·How we check this

A New Mexico DWI arrest under NMSA § 66-8-102 triggers two parallel processes: a criminal charge in magistrate, metropolitan, or district court, and an administrative license revocation by MVD New Mexico. Both move quickly. New Mexico is also notable for being the first state in the country to require an Ignition Interlock Device for any DWI conviction — a rule that has been in place since 2005 and applies to first offenses and repeat offenses alike.

The legal threshold

New Mexico's per-se DWI thresholds:

Adults 21+: 0.08% BAC.
Drivers under 21: 0.02% BAC under the state's zero-tolerance rule.
Commercial drivers (CDL): 0.04% BAC.
Aggravated DWI: 0.16% BAC, refusal to submit to a chemical test, or DWI causing bodily injury.

New Mexico also charges DWI on impairment evidence below the 0.08% threshold — the prosecution must prove that the driver was "under the influence of intoxicating liquor" to a degree that affected the ability to drive safely.

Administrative license revocation

The arresting officer typically takes the driver's New Mexico license on the spot and issues a notice of revocation. The driver has 10 days to request an administrative hearing before MVD New Mexico if they want to contest the revocation. Revocation lengths:

90 days for a first BAC failure (0.08+).
1 year for a chemical-test refusal first offense.
Longer for repeat offenders or aggravated DWI.

First-offense criminal penalties

A first DWI in New Mexico is a misdemeanor. Standard first-offense penalties include:

Up to 90 days in jail (mandatory minimum 48 hours for aggravated DWI — 0.16+, refusal, or bodily injury).
Fine of $300-$500, plus court costs.
License revocation by the court of 1 year, separate from administrative revocation but often running concurrently.
Mandatory completion of a 28-hour DWI School.
Mandatory Ignition Interlock Device for at least 1 year on every vehicle the offender drives, beginning when driving privileges are restored.
Probation up to 1 year.
Up to 24 hours of community service (for a non-aggravated first offense).
SR-22 financial responsibility filing for 3 years — see New Mexico insurance.

Aggravated DWI

An aggravated DWI carries enhanced penalties, including:

Mandatory minimum 48 hours in jail (cannot be suspended).
Fine of $500 plus court costs.
License revocation extended to a longer period.
IID period extended; the device may be required for two or more years.

An aggravated DWI is triggered by any of: BAC at or above 0.16%, refusal to submit to a chemical test, or causing bodily injury during the DWI offense.

Mandatory Ignition Interlock Device

New Mexico's mandatory IID rule, in place since 2005, requires installation of a state-approved Ignition Interlock Device for every DWI conviction, regardless of BAC level or whether it is a first offense. The IID:

Must be installed on every vehicle the offender owns or operates.
Costs the offender approximately $70-$100 per month plus a $100-$150 install fee.
Records all start attempts and rolling-test results, which are reported to the state.
Cannot be removed until the offender has completed the full IID period and demonstrated a clean driving record.

Combining the IID with an Interlock License during the revocation period allows the offender to continue driving an IID-equipped vehicle — see license reinstatement.

Repeat offenses

Penalties escalate with each subsequent DWI within the lifetime lookback period:

Second DWI: mandatory minimum 96 hours jail, $500-$1,000 fine, 2-year license revocation, 2-year IID.
Third DWI: mandatory 30 days jail, $750-$1,000 fine, 3-year license revocation, 3-year IID.
Fourth DWI: fourth-degree felony, up to 18 months prison, 4-year IID; subsequent felonies escalate to a third-degree felony with up to 3 years prison.

New Mexico uses a lifetime lookback for some enhancement purposes, meaning prior DWI convictions never roll off the record.

Implied consent and chemical test refusal

New Mexico's implied consent law treats every licensed driver as having consented to a chemical test when lawfully arrested for DWI. Refusal to submit to a breath, blood, or urine test triggers an automatic 1-year license revocation for a first refusal. Refusal also qualifies the offense as aggravated DWI for enhancement purposes if the driver is convicted.

Underage zero-tolerance

Drivers under 21 with a BAC of 0.02% or higher face an automatic 90-day administrative license revocation on a first offense, even without a criminal DWI charge. A criminal DWI charge above 0.08% applies regardless of age. See New Mexico teen license for additional rules that apply to provisional license holders.