DUI and DWI: How CA, AZ and NM Differ

Reviewed by Joseph L. Woods, Esq.

	California	Arizona	New Mexico
What it is called	DUI	DUI	DWI
Mandatory minimum jail on a first conviction	No — discretionary	Yes, on every conviction	See the New Mexico page
Graded by blood-alcohol level	Enhancements above the per-se level	Tiered, each tier raising the mandatory floor	Aggravated DWI by level, refusal, or injury
Ignition interlock	Conditional	Conditional	Required for every conviction, first offense included
Separate case about your licence	DMV administrative per-se action	Administrative suspension	Implied Consent Act revocation
Refusing the test	Carries its own consequence	Carries its own consequence	Makes the offense aggravated
When it becomes a felony	Circumstance and repeat-based	Aggravated DUI — circumstance-based	At a repeat-offense threshold

Arizona: jail is not discretionary

Arizona attaches a mandatory minimum jail term to every DUI conviction, including a first offense, and a judge has no power to waive it. The offense is graded into tiers by blood-alcohol level, with each tier raising the floor. That structure — rather than any particular judge — is what distinguishes an Arizona DUI from a California or New Mexico one.

New Mexico: an interlock on every conviction

New Mexico charges DWI rather than DUI, and requires an ignition interlock for every conviction including a first. It was the first state in the country to do that. It also treats refusing a test as something that makes the offense aggravated, rather than only as a licensing consequence — which catches people who assumed declining was the cautious choice.

All three: there are two cases, not one

The criminal charge and your driving privilege are decided separately, on separate timelines, with separate procedures and separate outcomes. It is possible to resolve one favourably and lose the other. The window to contest the licence side is typically short and unforgiving, which usually makes it the most urgent thing in a new case — confirm that deadline immediately rather than assuming it.

What these cases turn on

The reason for the stop, whether it was lawfully extended, how field sobriety testing was conducted and scored, and how breath or blood evidence was collected, stored and analysed. Testing equipment carries calibration and maintenance records; blood requires an unbroken chain of custody. These are technical questions with documented answers.

Read the detail for your state

This page compares. These go into what actually applies where you were hurt.

Common questions

Is jail mandatory for a first DUI in Arizona?

Arizona attaches a mandatory minimum jail term to every DUI conviction, including a first offense, and it is not within the judge’s discretion to waive. That is the clearest difference between Arizona and its neighbours here.

Why does New Mexico call it DWI?

It is the term the New Mexico statute uses. The difference is more than vocabulary — New Mexico requires an ignition interlock on every conviction and treats a test refusal as an aggravating element of the offense itself.

Will I lose my licence?

That is decided in a proceeding separate from the criminal case, on its own timeline, in all three states. The window to contest it is usually short, which is why it is normally the first thing to handle.

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More state comparisons

General information, not legal advice. Every situation is different, and which state’s law applies is itself a legal question.

DUI and DWI: How California, Arizona and New Mexico Differ