Phoenix DUID Lawyers
Arizona Drug DUI Charges Depend on the Statute & Evidence
Driving under the influence of drugs can involve prescription medication, marijuana, or other controlled substances. Arizona law addresses driving or actual physical control while impaired by any drug to the slightest degree, and it separately addresses the presence of certain drugs or drug metabolites in the body.
For example, if you took medically prescribed medication before driving and a police officer believes your driving ability was impaired, you could face DUI-related charges. A drug DUI arrest can also create a criminal case and a separate driver-license matter, with consequences that depend on the charge, testing circumstances, prior history, court disposition, and Arizona MVD action.

Unlike alcohol, Arizona doesn’t use a single numerical limit to establish drug impairment, so these cases often turn on field observations, blood and urine testing, the traffic stop, and the relationship between a detected substance and alleged impairment.
DUID cases in Phoenix require a fact-specific legal defense. If you are accused of driving under the influence of drugs, call (602) 702-5431 or contact us online now for a free case review. We can review the charged statute, available evidence, and time-sensitive driver-license concerns.
Former Law-Enforcement & Prosecution Insight for Your DUID Defense
A criminal charge isn’t a criminal conviction. You shouldn’t answer police questions without a lawyer present because statements can become part of the evidence against you.
At Knowles Law Firm, PLC, we prepare each defense around the facts of the arrest and are prepared for litigation when needed. Anthony Knowles previously worked as an Arizona police officer and has more than 20 years of experience with the Arizona criminal justice system. Our team also includes former prosecutors, giving us perspective on law-enforcement procedures and how the prosecution may evaluate a case.
Our Phoenix DUID attorneys closely review the reason for the stop, the basis for the arrest, statements attributed to the driver, field sobriety observations, blood or urine collection, laboratory handling, and whether the evidence supports the allegation actually charged.
Driving Under the Influence of Marijuana in Arizona
In Arizona, it is unlawful to drive while impaired by marijuana or another drug to the slightest degree under A.R.S. § 28-1381(A)(1). Arizona also has a separate drug-presence allegation under A.R.S. § 28-1381(A)(3), which concerns a drug defined by A.R.S. § 13-3401 or its metabolite in the body. The applicable subsection and evidence matter because drug presence doesn’t automatically establish impairment.
Arizona drivers are also subject to implied consent, meaning an arrest can raise separate testing and license issues. A refusal can lead to an administrative suspension, but the consequences depend on the circumstances and MVD action. To understand Arizona DUI violations clearly, keep these distinctions in mind:
- Arizona law can address alleged impairment by marijuana, prescription medication, or another drug.
- A separate allegation can concern the presence of a covered drug or drug metabolite.
- A lawful prescription is addressed by A.R.S. § 28-1381(D), which applies when the drug was used as prescribed by an authorized medical practitioner.
A medical-marijuana card or lawful prescription doesn’t resolve every marijuana DUI case. The charge, the drug identified, officer observations, testing evidence, and the claimed basis for impairment must all be examined.
Consequences of DUI of Marijuana in Arizona
Like DUI charges involving alcohol, a drug DUI allegation can carry serious criminal consequences. A conviction under A.R.S. § 28-1381 is generally a class 1 misdemeanor, subject to the statute’s sentencing provisions and the facts of the individual case.
Potential consequences can include:
- Jail time
- Fines and assessments
- Probation
- Screening or treatment requirements
- Community service
- Driving-related restrictions
Prior DUI convictions and aggravating allegations can change the potential exposure. For example, an allegation involving injury, a suspended license, or a minor passenger may carry different consequences. The charges and evidence should be reviewed before drawing conclusions about what a particular case may involve.
Arizona MVD Consequences After a Drug DUI Arrest
Driver-license consequences can proceed separately from the criminal case. Arizona’s implied-consent rules may apply after an arrest when an officer requests a test, and a refusal can result in an administrative suspension. According to the Arizona MVD, a first refusal can result in a 12-month suspension, while a second refusal within 84 months can result in a 24-month suspension.
An Arizona MVD suspension notice may provide only 30 days to request a hearing. Taking a test, refusing a test, the test result, and the later court case can lead to different administrative issues, so no single license outcome applies to every drug DUI arrest.
Reinstatement requirements can vary by situation and may involve completing a suspension period, screening, proof of financial responsibility, or other MVD requirements. We can review the notice and the available legal and driver-license questions during a free case review.
Defending DUI with Drug Charges in AZ
Drug DUI charges can be intimidating, but a careful review of the stop, arrest, testing, and officer procedures can identify issues that require a defense response.
A defense may challenge the allegation that the driver was impaired. The presence of a drug or metabolite does not by itself answer whether a driver was impaired to the slightest degree under an impairment-based charge.
Another issue may be whether the testing evidence supports the allegation. Blood and urine testing can require review of collection, preservation, laboratory analysis, interpretation, and chain of custody.
Fatigue, illness, nervousness, or a physical condition can appear unusual to an officer without establishing drug impairment. Field sobriety testing and drug-test evidence should be evaluated alongside the circumstances of the stop and arrest.
Legal defenses can also examine the legality of the traffic stop, the basis for the arrest, the handling of evidence, searches, blood draws, and whether chemical testing followed appropriate procedures.
How Drugged Driving Lawyers Assist Clients Charged with DUID in Phoenix
We review the details of the arrest, procedures followed by law enforcement, and the accuracy and meaning of drug-test evidence. The available defense path depends on the charge, evidence, prior record, procedural history, and the client’s objectives.
Our Phoenix DUID lawyers provide guidance from pretrial review through litigation when appropriate. We tailor our approach to the facts and circumstances of each case, including related driver-license concerns.
Our services may include:
- Case Analysis: Reviewing the arrest, law-enforcement procedures, and available discovery for evidence issues or procedural errors.
- Legal Guidance: Explaining the charges, legal process, and potential consequences that may apply.
- Evidence Review: Examining drug-test results, witness statements, and other evidence.
- Negotiation With Prosecutors: Evaluating negotiation options when appropriate.
- Representation in Court: Representing clients during court proceedings and preparing for litigation when necessary.
- Handling Appeals: Addressing appeals when necessary.
- License-Reinstatement Matters: Assisting with reinstatement procedures when eligible.
- Treatment Program Referrals: Recommending treatment programs when appropriate.
Contact a Phoenix DUID Attorney Today!
Request a free case review to discuss the arrest, the evidence, and the legal and driver-license questions that may require prompt attention. We represent clients in DUI defense and criminal defense matters. We provide individualized representation based on the charged statute, evidence, and any related MVD issues.
Contact an experienced Phoenix DUID lawyer to get started. Call (602) 702-5431 to speak with our team.
Case Victories
Always Striving For the Best Possible Outcome
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Dropped to Misdemeanor Disorderly Conduct Aggravated Assault
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Probation with no jail time Aggravated Assault
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Charge Reduced to a Misdemeanor Aggravated Assault
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Charge Reduced to a Misdemeanor Aggravated Assault
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Dismissed Aggravated Assault with a Deadly Weapon
Client Stories
Reviews From Past Clients
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"We owe you Knowles. They are Arizona's top DUI attorneys."- Thomas Mello
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"Simply the best law firm in Arizona!"- Former Client
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"Hire him if you want honesty and integrity!"- Former Client
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"They were professional towards getting my case dismissed, and very lenient on payments."- Former client
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"Defend yourself. Everyone deserves a second chance, and these attorneys in this firm will help you."- Former Client
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"We owe you Knowles. They are Arizona's top DUI attorneys."- Thomas Mello
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"I was arrested for DUI but the case dropped down to reckless driving. This tremendously helped me with my application for citizenship."- Former Client
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"Right away they found an error made by the prosecution and were able to get a significantly better plea offer."- Former Client