Arizona DUI & Traffic Violations: what to handle first around citation strategy, implied-consent pressure, and timing

Arizona's DUI law is structurally different from most states because it uses a three-tier BAC classification system, with mandatory jail sentences beginning at the first offense at all three levels. Under A.R.S. § 28-1381, any person who drives or is in actual physical control of a vehicle with a BAC of .08% or higher (or while impaired to the slightest degree by any substance) commits a standard DUI. Under A.R.S. § 28-1382, a person with a BAC of .15% or higher commits "Extreme DUI." A person with a BAC of .20% or higher commits "Super Extreme DUI." Each tier carries meaningfully higher mandatory minimum sentences, creating a staircase of escalating consequences that incentivizes extremely cautious drinking behavior before driving.

The "impaired to the slightest degree" language in A.R.S. § 28-1381(A)(1) is one of the most significant features of Arizona DUI law. Most states require the driver to be "under the influence" or "substantially impaired" — Arizona's "slightest degree" standard is explicitly less demanding. Arizona courts have interpreted this standard strictly: even the slightest detectable impairment, if caused by alcohol or drugs, can sustain a DUI conviction regardless of whether the BAC was above .08%. This means a person who tests at .06% BAC but demonstrates observable impairment (failed field sobriety tests, erratic driving pattern, slow reaction in performance tests) can be convicted of DUI.

Arizona's Three-Tier DUI System: Mandatory Consequences

Standard DUI (.08%-.149% BAC or impaired to slightest degree): First offense: mandatory minimum 24 hours jail (10 days jail with possibility of all but 24 hours suspended upon completion of screening); $250 fine plus surcharges (total cost typically $1,500-$2,500); mandatory drug/alcohol screening and education/treatment program; 90-day license suspension (MVD administrative); ignition interlock device (IID) required for 1 year after license reinstatement; 8 points on driving record. Second offense within 7 years: mandatory 90 days jail (minimum 30 days); $500 fine plus surcharges; 1-year license revocation; IID 1 year after reinstatement; SR-22 required. Extreme DUI (.15%-.199%): First offense: minimum 30 consecutive days jail (all but 9 days suspended if alcohol screening completed); minimum $2,500 fine plus surcharges (actual total often exceeds $3,500); same license suspension and IID as standard; drug/alcohol counseling required. Second Extreme DUI within 7 years: minimum 120 days jail; $3,250+ fines; 1-year revocation; 1-year IID. Super Extreme DUI (.20%+): First offense: minimum 45 consecutive days jail (all but 14 days may be suspended); minimum $2,750 fine plus surcharges; same IID and license consequences. These are Arizona's mandatory minimums — the actual costs including fines, fees, insurance increases, and IID costs routinely reach $10,000-$20,000 for a first offense.

Aggravated DUI: Class 4 Felony

Arizona's aggravated DUI (A.R.S. § 28-1383) elevates a DUI to a Class 4 felony in four circumstances: (1) DUI while driving on a suspended, cancelled, or revoked license; (2) DUI with a prior DUI conviction within 7 years (making the third offense a felony even if the third offense itself was not extreme or super extreme); (3) DUI while a person under age 15 is in the vehicle (regardless of BAC level or sobriety level — even first-offense, low-BAC DUI becomes an aggravated Class 4 felony if a child is present); (4) DUI while required to have an ignition interlock device on the vehicle (and not having one, or driving a vehicle without one). Class 4 felony consequences: prison sentence (not just jail) — minimum 4 months prison (the statute specifies that probation is not available for the first 4 months); 3-year license revocation; IID for 2 years after reinstatement; felony conviction impacting employment, housing, firearm rights, and immigration status. The "child present" aggravating circumstance is particularly consequential: a parent who makes the very bad decision to drive after two beers with their 12-year-old in the car faces a felony even if their BAC was only .09% and they show no impairment. Arizona defense attorneys always check for passengers under 15 in any DUI case.

Arizona Cannabis DUI: The Metabolite Problem

A.R.S. § 28-1381(A)(3) prohibits driving while there is any drug or its metabolite in the driver's body if the driver is impaired to any degree. Arizona's blood test tests for both active THC (delta-9-tetrahydrocannabinol) and THC-COOH (the primary inactive metabolite of THC that can remain in the blood for days to weeks after marijuana use). The Arizona Supreme Court addressed cannabis DUI in Dobson v. McClennen, 238 Ariz. 389, 361 P.3d 746 (2015) — the court held that the state must prove impairment when charging under the "impaired to the slightest degree" prong, and that a non-zero THC metabolite alone (absent evidence of impairment) may not be sufficient. However, under the per se provision at issue in pre-Dobson prosecutions, the mere presence of ANY marijuana metabolite was sufficient for conviction. After Prop 207 (2020) legalized marijuana: the legal use of marijuana outside of driving does NOT protect a user who then drives while impaired. The Prop 207 provision explicitly states it does not affect the prohibition on impaired driving. A person who legally used marijuana two days ago, no longer feels high, and drives may still test positive for THC metabolites and face a DUI investigation — though the prosecution must demonstrate impairment, not just metabolite presence, after Dobson.