Arizona BAC Limits Explained — How 0.08, 0.15 & 0.20 Play Out in Court
In Arizona, the legal BAC limit for most drivers is 0.08% within two hours of driving under A.R.S. § 28-1381(A)(2). Commercial drivers face a 0.04% limit while operating a commercial vehicle, and under-21 drivers are subject to zero-tolerance laws (A.R.S. § 4-244(34)). Extreme DUI tiers begin at 0.15 and 0.20 (A.R.S. § 28-1382).
Arizona’s BAC thresholds and what they mean
Arizona law creates several important blood alcohol concentration (BAC) thresholds that affect how a DUI is charged, what evidence the State needs, and the sentencing range if there is a conviction. The general per se limit is 0.08% within two hours of driving or being in actual physical control of a vehicle. Prosecutors routinely proceed under A.R.S. § 28-1381(A)(2) when a breath or blood test reports 0.08% or more within the statutory two-hour window. A reading of 0.08% is not required to prosecute a DUI, however. Under A.R.S. § 28-1381(A)(1), the State can obtain a conviction by proving you were impaired to the slightest degree, even with a BAC below 0.08% or without a chemical test.
Commercial drivers have a stricter standard: 0.04% while driving a commercial motor vehicle. The lower 0.04% threshold reflects heightened safety expectations for CDL holders and can trigger both criminal prosecution and significant commercial licensing consequences. For drivers under 21, Arizona’s zero-tolerance rule under A.R.S. § 4-244(34) prohibits driving with any spirituous liquor in the body, regardless of measured BAC. Under-21 cases may proceed as civil or criminal violations and can carry license sanctions through the Motor Vehicle Division (MVD).
Arizona also assigns enhanced penalties at higher concentrations under the Extreme DUI statute, A.R.S. § 28-1382. An alcohol concentration of 0.15% or more is charged as Extreme DUI. At 0.20% or more within two hours of driving, the offense is sometimes colloquially called “Super Extreme,” with heightened mandatory jail terms and fines under § 28-1382(A)(2). These tiers magnify exposure and often drive plea positions in courts such as Phoenix Municipal Court, Tempe Municipal Court, and Mesa Municipal Court.
Beyond thresholds, how BAC evidence is obtained and presented matters. Arizona appellate courts have repeatedly emphasized constitutional limits on blood draws and the need for valid consent or a warrant. In State v. Valenzuela, 239 Ariz. 299 (2016), the Arizona Supreme Court reinforced that implied consent is not actual consent; without a warrant or an exception, a blood draw may be suppressed. The “slightest degree” standard has also been clarified. In State v. Zaragoza, 221 Ariz. 49 (2009), the Court approved a jury instruction explaining that any impairment that lessens a person’s ability to operate a vehicle safely can satisfy § 28-1381(A)(1), even if the BAC is below 0.08%.
Practically, these rules play out in arraignments and pretrial conferences across Maricopa County. In misdemeanor courts (including Glendale City Court and other city/justice courts), prosecutors rely on breath machine records, blood lab reports, officer testimony about driving and field sobriety tests, and video. A well-prepared defense challenges the stop, the two-hour window, instrument accuracy, the method of blood collection, and the State’s impairment narrative. If felony aggravators under § 28-1383 are alleged (for example, a third DUI within 84 months or a suspended license), the case is filed in Maricopa County Superior Court, where felony procedures and potential prison exposure increase the stakes.
If you are weighing next steps, speak with an experienced DUI lawyer in Arizona early. For arrests in Phoenix, Tempe, Mesa, and elsewhere in Maricopa County, early intervention can protect your MVD rights and preserve critical defenses.
Key Arizona statutes, penalties & procedure
Core DUI statutes and BAC limits
• A.R.S. § 28-1381(A)(2): Per se DUI if alcohol concentration is 0.08% or more within two hours of driving (0.04% for commercial drivers while operating a commercial motor vehicle).
• A.R.S. § 28-1381(A)(1): DUI if impaired to the slightest degree, regardless of BAC.
• A.R.S. § 28-1382(A)(1)-(2): Extreme DUI (≥0.15%) and ≥0.20% tier with additional mandatory penalties.
• A.R.S. § 28-1383: Aggravated DUI (e.g., license suspended/canceled/revoked, third DUI in 84 months, DUI with a child under 15 in the car, DUI while ordered to use an interlock, or wrong-way DUI).
Affirmative defenses & evidentiary rules
• A.R.S. § 28-1381(H): Affirmative defense if the ≥0.08% BAC within two hours resulted from alcohol consumed after driving.
• A.R.S. § 28-1321 (Implied Consent): Drivers must submit to breath, blood, or urine testing when lawfully arrested; refusal triggers a one-year (or two-year with prior) administrative suspension, but police typically still need a warrant for blood unless an exception applies.
• Key cases: State v. Valenzuela (suppression where consent is coerced); State v. Havatone, 241 Ariz. 506 (2017) (limits on warrantless blood for unconscious suspects); State v. Zaragoza (clarifies “slightest degree”).
Penalty ranges tied to BAC
• First-offense DUI (A.R.S. § 28-1381): Minimum 10 days jail, with 9 suspended upon alcohol screening and treatment; fines/assessments around $1,250; ignition interlock; counseling; and a 90-day MVD suspension (typically 30 days no driving, then 60 restricted).
• Extreme DUI (A.R.S. § 28-1382(A)(1)): Minimum 30 consecutive days jail and higher fines; interlock typically required.
• ≥0.20% tier (A.R.S. § 28-1382(A)(2)): Minimum 45 consecutive days jail and enhanced financial penalties.
• Aggravated DUI (A.R.S. § 28-1383): Felony exposure; mandatory prison time may apply (for example, a 4-month prison term as a condition of probation for certain Class 4 aggravated DUIs).
MVD consequences and deadlines
• A.R.S. § 28-1385: If your test is 0.08% or more (0.04% CDL), MVD imposes a 90-day administrative suspension. You have a short window (generally 15 days from service of the order) to request a hearing with the MVD Executive Hearing Office in Phoenix.
• A.R.S. § 28-1321: Refusals trigger a 12-month (or 24-month with prior) administrative suspension, separate from any criminal case. Winning the criminal case does not automatically undo an administrative license action.
Where Arizona DUI cases are heard
• Misdemeanor DUIs: City and justice courts such as Phoenix Municipal Court, Tempe Municipal Court, Mesa Municipal Court, Scottsdale City Court, Glendale City Court, and Maricopa County Justice Courts.
• Felony DUIs: Maricopa County Superior Court. Procedures include an initial appearance, status conferences, motion practice (e.g., to suppress BAC evidence), and trial.
Talk to a DUI lawyer about your BAC
Oliverson Law DUI & Criminal Defense has handled DUI matters from both sides of the courtroom. Founder Derek Oliverson served as a police officer in Henderson, NV, then as a prosecutor in Mohave County, AZ, and later as a judge in Page Magistrate Court and Glendale City Court before entering private practice. Attorney David Tangren is a University of Arizona law graduate and former prosecutor with the Pima County Attorney’s Office.
What to do next after a DUI stop
Act before MVD deadlines
Mark the 15-day window to request an MVD hearing after receiving an admin per se or implied consent notice. Preserving your right to a hearing can prevent an automatic suspension or create options for a restricted license.
Secure and review evidence
Obtain the police report, body-cam video, breath ticket, calibration and maintenance records, blood kit chain-of-custody, and lab chromatograms. Early expert review can expose rising BAC issues, sampling errors, or two-hour-window weaknesses.
Evaluate suppression and negotiation paths
Assess reasonable suspicion for the stop, probable cause for arrest, implied-consent warnings, and whether a valid warrant supported the blood draw. Strong suppression arguments often improve outcomes at pretrial conferences in Phoenix, Tempe, or Mesa courts.
Plan for interlock, classes, and insurance
If a conviction is likely, prepare proactively for ignition interlock logistics, SR-22 or equivalent insurance needs, and court-ordered screening. Proactive steps can reduce jail, fines, or restrictions under Arizona sentencing schemes.
Common mistakes to avoid
Get legal help today
If you face DUI charges tied to a BAC of 0.08, 0.15, or 0.20+, knowledgeable advocacy can change the outcome. Since 2009, Oliverson Law DUI & Criminal Defense has represented clients across the Phoenix metro from our Tempe office at 60 E Rio Salado Pkwy, Suite 900, Tempe, AZ 85281. Our firm is rated 4.9/5 (150+ reviews). Call for a confidential case review.
Frequently Asked Questions
In Arizona, commercial drivers are held to a 0.04% BAC standard while operating a commercial motor vehicle under A.R.S. § 28-1381(A)(2). A 0.04% or higher test can support a per se DUI, along with potential CDL disqualification through MVD. Separate administrative actions may apply even if the criminal case is dismissed, so request an MVD hearing within 15 days.
Yes. Under A.R.S. § 28-1381(A)(1), prosecutors can proceed by proving you were impaired to the slightest degree, even if your BAC is below 0.08% or there is no chemical test. Evidence can include driving behavior, field sobriety tests, officer observations, and video. State v. Zaragoza confirms that even minimal impairment may satisfy this standard.
Under A.R.S. § 28-1382, Extreme DUI begins at 0.15% and carries a minimum 30 consecutive days in jail and higher fines. At 0.20% or more, mandatory minimum jail increases to at least 45 consecutive days, with enhanced financial penalties and interlock requirements. Courts also consider aggravating or mitigating factors, prior DUIs, and compliance with treatment.
If you receive an admin per se or implied consent notice, you generally have 15 days to request an MVD hearing. A.R.S. § 28-1385 authorizes a 90-day suspension for tests at or above 0.08%, and A.R.S. § 28-1321 imposes a 12-month suspension for refusals (or 24 months with a prior). Administrative actions are separate from court proceedings.
Call (480) 582-3637 or request your consultation online. We handle DUI cases in Phoenix, Tempe, Mesa, and throughout Maricopa County courts.