Teen DUI Laws & Penalties (Underage DUI)

Posted On March 14, 2025 Drunk Driving,Drunk Driving Charges,DUI,DWI by John Allen Phebus
Teen DUI Laws & Penalties (Underage DUI)

At The Law Offices of John Phebus, we understand how overwhelming it can be to navigate teen DUI laws in Scottsdale, AZ. Arizona has some of the strictest DUI laws in the country, and penalties for underage drivers are particularly severe. If your teen is charged with underage DUI, it is crucial to understand the legal framework, potential consequences, and available defense strategies. A conviction can lead to license suspension, fines, mandatory education programs, and even rehabilitation. Moreover, a DUI record at a young age can significantly impact future opportunities, including college admissions and career prospects. By understanding Arizona’s laws and your legal options, you can take the right steps toward minimizing penalties and protecting your teen’s future.

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Understanding Underage DUI Laws and Penalties in Arizona

Arizona takes underage drinking and driving very seriously. The state has enacted strict laws to prevent minors from operating vehicles while under the influence, aiming to enhance road safety and deter young drivers from consuming alcohol.

Teen Drinking and Driving Laws in Arizona

Arizona has a zero-tolerance policy for underage DUI offenses. According to Arizona Revised Statutes §4-244(34), it is illegal for anyone under 21 to drive or be in actual physical control of a vehicle with any alcohol in their system. This means that even a trace amount of alcohol detected in a minor’s system can result in a DUI charge, regardless of impairment.

Teen Drivers and Zero-Tolerance DUI Penalties

Arizona’s zero-tolerance policy is reinforced by Arizona Revised Statutes §28-1381, which outlines the legal provisions for DUI offenses and penalties. A breathalyzer, blood test, or field sobriety test showing any measurable alcohol can result in an arrest and prosecution. The goal of these laws is to prevent alcohol-related accidents and fatalities among young drivers, ultimately ensuring safer roads for everyone.

Blood Alcohol Concentration (BAC) Levels for Underage Drivers

For drivers under 21, any detectable Blood Alcohol Concentration (BAC) is illegal. Unlike adults, who require proof of impairment below 0.08% BAC, minors can face DUI charges for any measurable alcohol level in their system. This strict standard is designed to eliminate underage drinking and driving altogether.

Drug Use and Underage Driving Legal Consequences

Arizona’s DUI laws also cover drug-related impairment. Underage drivers found with illegal drugs, marijuana, or certain prescription medications in their system can also be charged with a DUI. The law applies to any substances that impair a driver’s ability to operate a vehicle safely, including legally prescribed medications if they cause impairment.

What Prosecutors Must Show in Underage DUI Cases

To secure an underage DUI conviction, prosecutors must establish the following elements:

  1. Operating or Being in Actual Physical Control of a Vehicle – The individual must have been driving or in control of a vehicle, even if it was not moving (e.g., sitting in the driver’s seat with the engine running). DUI charges can apply on both public roads and private property in Arizona.
  2. Unlawful Amount of Drugs or Alcohol – Any detectable amount of alcohol or drugs (with proof of impairment) in an underage driver’s system is considered unlawful.
  3. Location of the Incident – The law applies whether the incident occurs on a public road or in certain private areas where the public has access.

Arizona Underage DUI Laws: Penalties and Defense

A teen DUI conviction in Arizona can lead to severe penalties, including:

Driver’s License Suspension for Underage DUIs

A first-time underage DUI conviction can result in a driver’s license suspension for up to two years. However, some individuals may be eligible for a restricted permit after 90 days, allowing limited driving privileges for work or school. It’s important to note that there are two separate processes that affect driving privileges: the criminal court case and an administrative MVD hearing that must be requested within 30 days of the arrest to preserve the right to challenge the license suspension.

Fines for Underage DUIs

Depending on the case, convicted minors may face fines up to $500 to $1,000, though these amounts can increase if additional charges apply. These financial penalties serve as a strong deterrent to discourage underage drinking and driving. Additional costs often include, court fees, probation costs, and expenses for required education programs.

Community Service and Alternative Sentencing

While jail time is not mandatory for most underage DUI offenses, judges may impose alternative penalties such as community service and alcohol education programs. Minors under 18 are typically processed through juvenile court, which prioritizes rehabilitation over incarceration. The juvenile court system offers more flexibility in sentencing and focuses on intervention strategies to prevent future offenses.

Ignition Interlock Devices for Underage DUI Offenders

Some offenders may be required to install an ignition interlock device (IID), which prevents a vehicle from starting if alcohol is detected on the driver’s breath. This measure ensures that the individual remains sober behind the wheel. For underage DUI cases, the installation period is typically at least six months, even for first-time offenders.

Treatment and Educational Requirements for Underage DUI Violations

Many underage DUI offenders must complete alcohol education or treatment programs. These programs are intended to address substance use issues and prevent repeat offenses. Programs typically range from 16 to 30 hours of education and may include substance abuse screening and follow-up treatment if deemed necessary. Completion of these programs is often required before driving privileges can be reinstated.

When an Underage Offender Violates Standard DUI Laws

If an underage driver has a BAC of 0.08% or higher, they may face standard DUI charges, which carry harsher penalties similar to those imposed on adult offenders:

  • Longer license suspensions – A conviction can result in an extended loss of driving privileges, making it difficult for young drivers to maintain employment or continue their education.
  • Higher fines – Fines for standard DUI violations are significantly steeper than underage DUI penalties, often reaching thousands of dollars.
  • Mandatory jail time – Unlike underage DUI penalties that may focus on education and rehabilitation, standard DUI convictions can include mandatory jail sentences, even for first-time offenders. First-time offenders typically face a minimum of 10 days in jail (with 9 potentially suspended upon completion of alcohol treatment).

Since a higher BAC level indicates greater impairment, Arizona law imposes more severe consequences in these cases. Additionally, offenders may be required to attend alcohol treatment programs, install an ignition interlock device, or face probationary restrictions that impact their daily lives. These increased penalties highlight the state’s commitment to reducing impaired driving incidents and protecting public safety.

Comparing Underage DUI Laws Across the US

While this guide focuses on Arizona’s laws, underage DUI laws vary by state. Some states impose harsher penalties, such as mandatory jail time and longer license suspensions, while others offer diversion programs for first-time offenders. Additionally, state laws differ on set-aside and expungement policies, meaning that a DUI conviction in one state may have longer-lasting effects than in another. If you are dealing with an underage DUI charge outside Arizona, consult a local DUI attorney to understand your specific legal options.

Seeking Legal Advice and Representation

At The Law Offices of John Phebus, we have extensive experience defending teens facing DUI charges in Scottsdale, AZ. Our legal team is committed to protecting your teen’s rights, minimizing penalties, and providing the strongest possible defense. We understand both the criminal and administrative aspects of underage DUI cases and will guide you through both processes to achieve the best possible outcome.

Frequently Asked Questions

Understanding Arizona’s Zero-Tolerance Underage DUI Law

In Arizona, the law is unforgiving for underage drivers who consume alcohol. Under the state’s zero-tolerance policy, it is illegal for anyone under the age of 21 to operate or be in actual physical control of a vehicle with any detectable amount of alcohol in their system.. This strict approach, codified in A.R.S. § 4-244(34), doesn’t require proof of impairment or a specific blood alcohol concentration (BAC) level—any presence of alcohol leads to a DUI charge.

Key Aspects of the Underage DUI Law:

This law reflects Arizona’s commitment to preventing underage drinking and driving, aiming to protect young drivers and the community at large from the dangers associated with alcohol consumption and vehicular operation.

Get In Touch With Us

If you would like to discuss options on your case and how we can provide legal help, contact The Law Offices of John Phebus Glendale Criminal and Personal Injury Lawyer today and connect with one of our highly experienced Glendale criminal defense attorneys.


John Allen Phebus – Experienced Personal Injury & Criminal Defense Attorney

John Phebus is a seasoned attorney specializing in personal injury and criminal defense law. With a focus on DUI defense, vehicular crimes, and serious injury cases, John has been fiercely advocating for his clients, ensuring they receive the representation and compensation they deserve. His expertise and dedication have led to numerous successful outcomes. If you’re seeking a knowledgeable and passionate attorney who will fight for your rights, John Phebus is here to help.

Years of experience: +30 years

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This page has been written, edited, and reviewed by a team of legal writers following our comprehensive editorial guidelines. This page was approved by Founding Partner, John Allen Phebus who has more than 20 years of legal experience as a practicing personal injury attorney.