Arizona DUI Defense Law

What Is DUI Defense Law in Arizona?

Arizona has among the strictest DUI laws in the United States, codified in ARS § 28-1381 et seq. The state operates on a four-tier structure: Standard DUI (BAC 0.08+ under § 28-1381), Extreme DUI (BAC 0.15+ under § 28-1382), Super Extreme DUI (BAC 0.20+), and Aggravated DUI (§ 28-1383, Class 4 felony). Mandatory minimum jail applies to every tier — even a first-offense Standard DUI carries 10 days minimum (9 suspendable with ignition interlock).

All convictions require interlock installation for at least 12 months. Aggravated DUI triggers: third DUI in 84 months, DUI on suspended license, DUI with a child under 15 in the vehicle, or DUI in violation of an existing interlock requirement. Class 4 felony sentencing range is 1–3.75 years for first-time felony offenders; presumptive 2.5 years.

When Do You Need a DUI Defense Attorney?

Critical defense areas: stop validity (was there reasonable suspicion? — challenging the initial traffic stop can suppress all subsequent evidence), arrest probable cause (field sobriety test administration, breath/blood draw procedures), implied consent issues under ARS § 28-1321 (refusal-of-test triggers automatic 1-year license suspension separate from the criminal case), breath test calibration and chain of custody, and CDL consequences under 49 CFR § 383.51 (any DUI in any vehicle disqualifies CDL for 1 year).

Timing matters: you have only 15 days from arrest to request an Admin Per Se hearing to contest administrative license suspension. Missing this deadline forfeits the right to challenge the suspension regardless of how the criminal case resolves. The criminal case and license-suspension hearing run on parallel tracks; both need attention from day one.

Arizona DUI Defense Sub-Specialties

DUI Defense covers several distinct case types in Arizona, each with its own statutory framework and procedural rules. Below are the most common sub-specialties — with the Arizona-specific provisions that distinguish them.

🚙 Standard DUI

Arizona's basic DUI offense is codified at ARS § 28-1381(A). The state prosecutes under two main theories: (1) impairment-based — driving while "impaired to the slightest degree" by alcohol or drugs (no minimum BAC needed), and (2) per-se — BAC of 0.08+ within 2 hours of driving. Commercial drivers have a 0.04 limit (ARS § 28-1381(A)(4)). Standard DUI is a Class 1 misdemeanor. Minimum penalties for a first conviction: 10 days jail (9 suspendable if interlock is installed), $1,250+ fines and surcharges, 12 months of ignition interlock, attending alcohol classes, and 90-day license suspension. Refusal to take a breath/blood test triggers implied consent license suspension under ARS § 28-1321.

📈 Extreme DUI (BAC 0.15+)

Extreme DUI under ARS § 28-1382(A)(1) applies when BAC is 0.15 or higher within 2 hours of driving. Mandatory penalties significantly escalate: 30 days minimum jail (9 days suspendable if interlock + alcohol screening completed), higher fines ($2,500+), and 12-month interlock. A second Extreme DUI within 7 years raises minimum jail to 120 days. Extreme DUI is still a Class 1 misdemeanor but the penalty structure is severe — prosecutors often charge it concurrently with Standard DUI, allowing a plea-down option for defendants. Recent rises in marijuana-impaired driving have led some prosecutors to charge under impairment theory even at lower BAC if other drugs are present.

📈📈 Super Extreme DUI (BAC 0.20+)

Super Extreme DUI under ARS § 28-1382(A)(2) applies at BAC 0.20 or higher. Minimum jail jumps to 45 days (14 suspendable with conditions), fines $3,200+, and the standard 12-month interlock. A second Super Extreme within 7 years requires 180 days minimum jail. At BAC 0.20+, the legal defenses narrow significantly — breath-test challenges become procedural rather than calibration-based, and impairment is often visible on body-cam video. Counsel often focuses on procedural defenses: stop validity (was reasonable suspicion present), arrest validity (probable cause), and chain-of-custody on the breath or blood sample. Successful suppression motions on these grounds can dismantle even high-BAC cases.

🚨 Aggravated DUI (Felony)

Aggravated DUI under ARS § 28-1383 is a Class 4 felony — the most serious DUI charge. Four triggers: (1) third DUI within 84 months, (2) DUI while driver's license is suspended, revoked, or canceled, (3) DUI with a child under 15 in the vehicle, or (4) DUI in violation of an ignition interlock requirement. Penalties: 4 months minimum prison (no probation eligibility for third-DUI variety), 3-year license revocation, mandatory interlock after restoration, and a permanent felony record. Class 4 felony sentencing range is 1-3.75 years for first-time felony offenders; repeat felony offenders face presumptive 4.5 years. Aggravated DUI cases often involve plea negotiations to lesser charges to avoid the felony record.

👶 Underage DUI

Arizona has a zero-tolerance standard for drivers under 21. ARS § 28-1381(A)(3) makes it illegal for a driver under 21 to have any alcohol in their system while driving — not just impairing levels. Penalties: 2-year license suspension on first offense (ARS § 28-3320), mandatory alcohol screening and treatment, fines, and possible community service. Underage drivers can also be charged under regular DUI statutes if BAC reaches 0.08 or impairment is shown. Notably, the implied consent statute applies — refusing a breath test triggers automatic license suspension. Diversion programs may be available for first-time offenders, particularly for those near 21 with no prior record.

💊 Drug DUI

Arizona criminalizes driving with any trace of a controlled substance in your system under ARS § 28-1381(A)(3) — known as a per-se drug DUI. This applies to illegal drugs and to prescription medications taken without a valid prescription. After Prop 207 legalized recreational marijuana for adults 21+, the AZ Supreme Court held in State ex rel. Montgomery v. Harris that THC metabolite alone (Carboxy-THC) is no longer sufficient for conviction — active THC or impairment is now required. Prescription medication DUI is a common but defensible charge if the medication was legally prescribed and taken as directed; expert pharmacology testimony is often determinative.

🚛 Commercial Vehicle DUI

Commercial driver's license (CDL) holders face stricter limits: BAC 0.04 while operating a commercial motor vehicle under ARS § 28-1381(A)(4). Any DUI conviction triggers a 1-year CDL disqualification (Federal Motor Carrier Safety Regulation 49 CFR § 383.51) — even when the DUI was in a non-commercial vehicle. A second DUI conviction disqualifies the CDL for life. Because livelihood is at stake, commercial-vehicle DUI defense often focuses on plea options that minimize CDL impact (e.g., reckless driving plea). Refusal to test triggers a separate 1-year CDL disqualification. Hazmat-endorsed drivers face heightened consequences.

Costs and Timeline

First offense: $3,000-$7,000. Extreme DUI: $5,000-$10,000. Aggravated (felony): $10,000-$25,000+. Court fines add $1,500-$4,000+.

Arizona Laws and Statutes

A.R.S. § 28-1381 (standard), § 28-1382 (extreme), § 28-1383 (aggravated), § 28-1385 (implied consent). First offense: 10 days jail (9 suspended), $1,250+ fines, interlock device.

DUI Defense Attorneys by County

Pre-screened dui defense attorneys serving each Arizona county. Counts reflect Standard-tier attorneys with active bar status. Counties with active listings show featured attorneys; counties without local listings link to our statewide directory.

Other Arizona Counties

DUI Defense attorney coverage is still being built out in these counties. Click any county to browse our statewide pool.

Arizona DUI Defense Guides & Resources

Free guides covering key topics in Arizona dui defense. Learn the basics before you hire an attorney.

Common Questions About Arizona DUI Defense