Arizona Drug DUI Lawyers
Charged with drug DUI in Arizona? Under A.R.S. § 28-1381 you can be charged for driving impaired by any drug, including marijuana and prescription medication, or simply for having a drug or its impairing metabolite in your body. A blood test, not a breath test, drives these cases, and a positive result does not mean a conviction. Do not talk to police before you call us.
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When you call Tamou Law Group, you reach a firm that handles criminal defense exclusively, with serious experience defending drug DUI, marijuana DUI, prescription-medication DUI, and metabolite cases across Arizona. Our team includes former prosecutors who charged drug DUIs and law enforcement officers who made the stops, so we know exactly how the State uses blood tests and drug-recognition experts, and where those cases fall apart.
At many large firms, the name on the building is a marketing figurehead, you will rarely get them on the phone and your case is handed to a junior associate. When you hire Tamou Law Group, your case is handled by a full team of attorneys, not associates, including Michael Tamou. Call 623-321-4699 for a free, confidential consultation, 24/7.
What Is a Drug DUI in Arizona?
Quick answer: Arizona charges drug DUI two ways under A.R.S. § 28-1381: (A)(1) driving while impaired to the slightest degree by any drug, and (A)(3) driving with any proscribed drug or its impairing metabolite in your body, even without proof of impairment. It covers illegal drugs, marijuana, and prescription medication. A drug DUI is a Class 1 misdemeanor with the same penalties as an alcohol DUI. The strongest defenses are a valid prescription, the presence of only an inactive (non-impairing) metabolite, and challenges to the blood test and the drug-recognition evaluation.
Key Takeaways
- Drug DUI (A.R.S. § 28-1381) covers illegal drugs, marijuana, and prescription medication.
- There are two theories: (A)(1) actual impairment, and (A)(3) any drug or its impairing metabolite in your body.
- Under Arizona Supreme Court law, an inactive metabolite (such as carboxy-THC) alone cannot sustain an (A)(3) charge, only an impairing compound counts.
- A valid prescription is a defense to the (A)(3) “drug in body” charge, though not to actual impairment.
- There is no breath test for drugs, the case rests on a blood draw and often a Drug Recognition Expert (DRE) evaluation, both challengeable.
- Recreational marijuana is legal to possess under Prop 207, but driving impaired by it is still a crime. See our Arizona marijuana DUI page.
- A drug DUI is a misdemeanor, but a 3rd in 84 months, a suspended license, or a child under 15 makes it an aggravated felony DUI.
- Your case is handled by a full team of attorneys, not associates, including Michael Tamou, available 24/7 at 623-321-4699.
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Class 1 Misdemeanor
Charged With Drug DUI?
A drug DUI under A.R.S. § 28-1381 carries the same penalties as an alcohol DUI, jail, fines, interlock, and license loss. A positive blood test is not the end of the story. Call before your first court date.
Call 623-321-4699 →A Prescription?
Was It Legal Medication?
A valid prescription is a defense to a “drug in body” charge. And an inactive metabolite, like carboxy-THC, cannot by itself prove a drug DUI under Arizona law.
See the Difference →Marijuana DUI
Cannabis Behind the Wheel?
Marijuana is legal to possess in Arizona, but driving impaired by it is still a DUI. THC lingers in the body for days, so a positive test rarely proves impairment at the wheel.
CALL NOWArizona Drug DUI Law: A.R.S. § 28-1381
Arizona’s DUI statute treats drugs differently from alcohol, in ways that create real defenses. Statutes link to azleg.gov.
Impairment Drug DUI, § 28-1381(A)(1)
It is unlawful to drive or be in actual physical control of a vehicle while impaired to the slightest degree by any drug. The State must actually prove impairment, the drug affected your ability to drive, which is far harder than simply showing a substance was present. Tired, ill, or nervous driving is not the same as drug impairment, and that gap is where the defense lives.
‘Drug in Body’ DUI, § 28-1381(A)(3)
Separately, it is unlawful to drive with any drug listed in A.R.S. § 13-3401, or its metabolite, in your body, regardless of impairment. This is the strict-liability theory prosecutors prefer. But Arizona’s appellate courts have held that an inactive metabolite incapable of causing impairment, such as carboxy-THC from marijuana, cannot sustain an (A)(3) charge. What is actually in the blood, and whether it can impair, is decisive.
The Prescription Defense, § 28-1381(D)
Arizona law provides that a person is not guilty of the (A)(3) “drug in body” charge if the drug was lawfully prescribed by a licensed practitioner and used as directed. Important caveat: this defense does not apply to the (A)(1) impairment charge, you can still be convicted if a valid prescription medication actually impaired your driving.
Marijuana DUI & Prop 207
Recreational marijuana is legal to possess in Arizona under Proposition 207, but driving impaired by marijuana remains a crime. Because THC and its metabolites can stay in the body for days or weeks, a positive test rarely proves impairment at the moment of driving. See our dedicated Arizona marijuana DUI page for the details.
Penalties & When It Becomes a Felony
A drug DUI is a Class 1 misdemeanor carrying the same penalties as an alcohol DUI: mandatory jail, fines, a certified ignition interlock, license suspension, and screening. It becomes an aggravated (felony) DUI if it is a third offense in 84 months, committed on a suspended license, or with a child under 15, and a fatal drug-impaired crash is charged as DUI causing death.
What the State Must Prove for Drug DUI
To convict you of Drug DUI under A.R.S. § 28-1381(A)(1) & (A)(3), the prosecutor must prove every one of these elements beyond a reasonable doubt. If even one fails, the charge fails.
- 1Driving or actual physical control. You were driving or in actual physical control of a vehicle.
- 2In Arizona, on a road or area open to the public. Arizona’s DUI laws applied to where you were.
- 3Impairment or a drug in your body. Either the drug impaired you to the slightest degree (A)(1), or a proscribed drug or its impairing metabolite was present (A)(3).
- 4A qualifying, impairing substance. For (A)(3), the substance must be a drug listed in § 13-3401 or an impairing metabolite, not merely an inactive one, and not a lawfully prescribed drug used as directed.
Examples of Conduct Charged as Drug DUI
- Driving after using marijuana, with THC detected in a blood test
- Driving while impaired by a prescription medication such as Ambien or an opioid
- A blood test showing an illegal drug or an impairing metabolite
- A drug-recognition officer alleging impairment with no chemical confirmation
Impairment vs. Metabolite
How the State charges your drug DUI determines what it must prove, and which defense wins.
| Theory | Statute | What the State Must Prove | Key Defense |
|---|---|---|---|
| Impairment | 28-1381(A)(1) | A drug actually impaired your driving to the slightest degree | No actual impairment; alternative explanations |
| Drug in body | 28-1381(A)(3) | A proscribed drug or its impairing metabolite was in your body | Valid prescription; inactive metabolite only |
A drug DUI can escalate to an aggravated (felony) DUI or, in a fatal crash, to DUI causing death. See also extreme DUI for alcohol cases.
Penalties for Drug DUI in Arizona
A drug DUI carries the same penalties as an alcohol DUI, mandatory jail, fines, interlock, and license loss, and escalates to a felony as a repeat or aggravated offense.
Misd.
First Drug DUI
Misd.
Second Drug DUI
Felony
Aggravated Drug DUI
| Charge | Class | Minimum Jail | License | Interlock |
|---|---|---|---|---|
| First Drug DUI | Class 1 Misd. | 10 days (often reduced to 1) | 90-day suspension | 12 months |
| Second Drug DUI (84 mo) | Class 1 Misd. | 90 days | 1-year revocation | 12 months |
| Aggravated Drug DUI | Class 4/6 Felony | 4 months prison (Class 4) | 1-year revocation | 24 months |
All drug DUIs also carry fines and assessments and mandatory alcohol/drug screening. Figures are approximate and change over time.
⚠ A Positive Test Is Not a Conviction
*A first drug DUI’s 10-day jail term can often be reduced to a single day with screening, but only if you are convicted. The presence of a drug, especially an inactive metabolite or a lawful prescription, frequently does not meet Arizona’s legal standard, which is why these cases should be fought before any plea.
Collateral Consequences
Beyond jail, a drug DUI brings a criminal record, a certified ignition interlock, sharply higher insurance (SR-22), license suspension, mandatory drug screening and treatment, and serious problems for commercial drivers (CDL), professional licenses, employment, and immigration for non-citizens. A prior drug DUI also counts toward a future felony.
Common Defenses in Arizona Drug DUI Cases
A drug DUI rests on a blood test and an officer’s opinion, not a breathalyzer number. That makes these cases highly defensible.
Attacking the Charge Itself
Inactive Metabolite Only. Under Arizona Supreme Court law, the mere presence of an inactive metabolite (such as carboxy-THC) cannot sustain an (A)(3) drug DUI. Only an impairing compound counts.
Valid Prescription. A drug lawfully prescribed to you is a statutory defense to the “drug in body” charge, so long as you were not actually impaired.
No Actual Impairment. For an (A)(1) charge, the State must prove the drug actually impaired your driving to the slightest degree, presence alone is not enough.
Use Days Earlier. Marijuana and other drugs linger in the body long after any effect ends. A positive test can reflect lawful, sober use days before the stop.
Attacking the Evidence
No Reasonable Suspicion or Probable Cause. If the stop or arrest was unlawful, the blood evidence can be suppressed and the case can collapse.
Blood-Draw & Chain-of-Custody Problems. An improper draw, unqualified collector, fermentation, contamination, or a broken chain of custody can render the blood result inadmissible.
Flawed DRE Evaluation. The 12-step drug-recognition protocol is subjective and often performed incorrectly. We expose the gaps between the officer’s conclusions and the science.
Unreliable Quantification. There is no established “impairing level” for most drugs the way there is for alcohol, so the State’s numbers rarely prove impairment at the wheel.
Medical & Alternative Explanations. Fatigue, illness, and medical conditions can mimic the “signs” police attribute to drugs.
After reviewing your case, we will explain which defenses apply and the best path forward.
CALL 623-321-4699The Experts We Bring to the Table
A drug DUI is a science-and-opinion case. The State leans on a crime lab and a drug-recognition officer; we answer with specialists who challenge both.
Forensic Toxicologists
Drugs & Impairment
Independently review the blood result and explain why the presence of a drug, or its metabolite, does not establish impairment at the time of driving.
Crime-Lab & GC/MS Analysts
Testing & Chain of Custody
Audit the blood draw, storage, contamination and fermentation risk, instrument calibration, and lab protocol, where a single failure can exclude the result.
Pharmacologists
Prescription & Dosage
Explain how lawfully prescribed medication behaves in the body, therapeutic versus impairing levels, and why a valid prescription supports the defense.
DRE-Challenge Experts
Drug Recognition Protocol
Dissect the 12-step drug-recognition evaluation, exposing the subjective judgments and procedural errors behind the officer’s impairment opinion.
Cannabis Science Experts
THC Pharmacokinetics
Explain why THC lingers for days after use and why a positive marijuana test rarely proves impairment behind the wheel.
Records & Discovery Specialists
Lab Records & Logs
Pull the full lab documentation, calibration history, and discovery the State would rather not produce, the paper trail that reveals an unreliable result.
What to Do After a Drug DUI Arrest
The steps you take right after a drug DUI arrest can decide whether the blood test and the DRE opinion hold up.
Say Nothing Beyond the Basics
Provide your license, registration, and insurance, then politely decline to answer questions and ask for a lawyer. Do not discuss any drug or medication use.
Note Any Prescriptions
If you take prescribed medication, preserve the bottle, the label, and your pharmacy records. A valid prescription is a defense to a ‘drug in body’ charge.
Act Fast on Your License
A drug DUI triggers a separate MVD action with a short deadline to request a hearing. Missing it can cost you your license before the criminal case resolves.
Write Down the Timeline
Note when you last used any substance and when you were stopped and tested. With drugs like marijuana, timing is central to the defense.
Preserve Everything
Keep the citation, release paperwork, and anything connected to the stop. Do not post about the arrest on social media.
Call Tamou Law Group at 623-321-4699
The sooner we are involved, the more we can do, demanding the lab and DRE records, protecting your license, and attacking the case before a plea. Available 24/7.
Mitigation: Shaping the Outcome
Where the evidence is strong, mitigation can reduce jail, protect your record, and keep a misdemeanor from becoming something worse.
We build mitigation packages that include early voluntary drug screening and treatment, proof of a valid prescription where relevant, a clean post-arrest record, employment and family ties, and a proportionality review of comparable Arizona drug DUI outcomes. Presented early, mitigation gives prosecutors and the court a reason to favor a reduced charge, diversion where available, or the low end of the range, and shows you took the matter seriously from day one.
The Early-Case Window
The period right after a drug DUI arrest is when the test and DRE evidence is most vulnerable, and most worth fighting.
Before a plea is entered, we can protect your license at the MVD, subpoena the crime-lab records and the drug-recognition evaluation, obtain your prescription history, and present the prosecutor with the weaknesses in the case, sometimes the difference between a drug DUI conviction and a dismissal. The sooner Michael Tamou is involved, the more leverage we have.
A Full Team of Attorneys, Not Associates
The single biggest factor in your defense is who actually handles your case, and how hard they fight it.
At many large firms, the name on the building is a marketing figurehead. You may never get them on the phone, and your case is handed to a rotating junior associate who has never tried a case like yours. At Tamou Law Group, your defense is handled by a full team of experienced attorneys, not junior associates, including founding attorney Michael Tamou. The same senior team handles your calls, your strategy, and your court dates.
Our reputation is built on results and on our clients’ words, a 5.0-star Google rating from people we have actually defended. Read them in the reviews below.
Arizona Drug DUI Lawyers at Tamou Law Group
Challenging the Blood Test and the ‘Drug Expert’A Proven Defense Process for Arizona Drug DUI Cases
- Challenge the Stop & the Arrest
- Attack the Blood Test & the DRE
- Prove No Impairment at the Wheel
A drug DUI is fundamentally different from an alcohol DUI. There is no breathalyzer and no legal “limit” for most drugs, so the State leans on a blood test and the opinion of a police Drug Recognition Expert (DRE). Both are far more vulnerable than the State suggests, especially because drugs like marijuana stay in the body long after any effect has worn off.
When you work with Tamou Law Group, you get a team that includes former prosecutors and law enforcement officers who have built drug DUI cases. We bring in our own forensic toxicologists and pharmacologists to separate the presence of a substance from actual impairment at the time of driving.
Presence is not impairment. A positive test can reflect use days earlier or a valid prescription, not impaired driving. Under Arizona law, an inactive metabolite alone is not enough, and that is where we attack.
Call Michael Tamou Today & Start Fighting These Charges Right Now
623-321-46991 Challenge the Stop & the Arrest
We review whether police had reasonable suspicion to stop you and probable cause to arrest. An unlawful stop can suppress everything that followed, including the blood draw.
2 Attack the Blood Test
We scrutinize the warrant, the draw, storage, fermentation, lab protocol, and chain of custody. A single broken link can make the result, the heart of a drug DUI, inadmissible.
3 Challenge the DRE & Impairment
The 12-step drug-recognition protocol is subjective and frequently overstated. We expose its flaws and show the State cannot prove you were actually impaired while driving.
4 Prescription & Metabolite Defenses
Where a drug was lawfully prescribed, or only an inactive metabolite is present, we raise the statutory and case-law defenses that can defeat an (A)(3) charge outright.
5 Reduce, Dismiss, or Try It
We push to dismiss, reduce the charge, or take the case to trial. That readiness is what gives our negotiations leverage and protects your record.
Recent Drug DUI Results
Every case is unique and results depend on the facts, but these examples reflect how our firm handles drug, marijuana, and prescription DUI cases across Arizona.
Marijuana DUI, Inactive Metabolite Only
Charges Dismissed
The blood test showed only inactive carboxy-THC. Because an inactive metabolite alone cannot sustain a drug DUI under Arizona law, the case was dismissed.
Prescription Medication DUI
Charges Dismissed
Our client held a valid prescription for the medication detected. We raised the statutory prescription defense and the ‘drug in body’ charge was dropped.
Drug DUI, Faulty DRE
Reduced Charge
By exposing errors in the drug-recognition evaluation and the absence of impairment evidence, we secured a reduced, non-DUI resolution.
Marijuana DUI, No Impairment
Charges Dismissed
With only past use and no proof of impairment at the wheel, the State could not meet its burden and dismissed.
Prescription Drug DUI
Charges Dismissed
Our client’s valid prescription defeated the ‘drug in body’ charge.
Drug DUI, Blood Chain-of-Custody
Charges Dismissed
Gaps in the blood chain of custody made the result inadmissible, ending the case.
What Clients Say About Tamou Law
Real Google reviews from clients we have defended across Phoenix and Maricopa County. Every review is from a criminal defense client, never padded with non-legal work.
Clients reach us searching in many ways, for the best drug DUI lawyer in Arizona, for lawyers who handle marijuana DUI charges, or for Phoenix drug DUI defense and a Scottsdale marijuana DUI attorney. However you found us, Tamou Law Group defends drug, marijuana, and prescription DUI cases across Phoenix, Scottsdale, Mesa, Tempe, Chandler, Gilbert, Glendale, Peoria, and all of Maricopa County, with representation statewide. Call 623-321-4699 for a free, confidential consultation, 24/7.
Arizona Drug DUI FAQs
Common questions about drug, marijuana, and prescription DUI charges, penalties, and defenses in Arizona.
What is a drug DUI in Arizona?
A drug DUI (A.R.S. 28-1381) is driving while impaired by any drug, or driving with a proscribed drug or its impairing metabolite in your body. It covers illegal drugs, marijuana, and prescription medication, and is a Class 1 misdemeanor with the same penalties as an alcohol DUI.
Can I get a DUI from prescription medication?
Yes. If a prescription medication impairs your driving to the slightest degree, you can be charged under A.R.S. 28-1381(A)(1). However, a valid prescription is a defense to the separate (A)(3) ‘drug in body’ charge, as long as you were not actually impaired.
Can I be charged with marijuana DUI if it is legal now?
Yes. Recreational marijuana is legal to possess under Prop 207, but driving impaired by it is still a crime. Because THC lingers in the body for days, a positive test rarely proves you were impaired at the time of driving. See our marijuana DUI page.
Does a positive drug test mean I will be convicted?
No. The presence of a drug is not the same as impairment, and under Arizona law an inactive metabolite alone cannot sustain a ‘drug in body’ charge. The blood test, the DRE evaluation, and the timing are all challengeable.
What is the inactive metabolite defense?
Arizona’s appellate courts have held that the mere presence of an inactive metabolite, such as carboxy-THC from marijuana, which cannot cause impairment, cannot sustain an (A)(3) drug DUI. What is actually in your blood, and whether it can impair, is decisive.
Is there a breath test for drugs?
No. There is no breathalyzer for drugs. The State relies on a blood test and the opinion of a Drug Recognition Expert (DRE), both of which are far more vulnerable to challenge than a breath alcohol reading.
How much jail time does a drug DUI carry?
A first drug DUI carries a mandatory minimum of 10 days in jail, often reduced to one day with screening, plus fines, interlock, and license suspension. A second within 84 months jumps to 90 days, and aggravated drug DUIs are felonies with prison exposure.
What is a DRE and can it be challenged?
A Drug Recognition Expert is a police officer trained in a 12-step protocol to opine that a driver is impaired by drugs. It is subjective and frequently performed incorrectly, and our experts regularly expose the gap between the officer’s conclusions and the science.
Will I lose my license for a drug DUI?
Yes. A drug DUI brings a license suspension and a certified ignition interlock requirement, plus a separate MVD action with a short deadline to request a hearing. We address both the criminal case and the license.
Should I talk to the police about what I took?
No. Provide your basic documents, then politely decline to answer questions and ask for a lawyer. Statements about drugs or medication are exactly what the State uses to prove a drug DUI.
Will I get a real attorney or a junior associate?
At many large firms the name on the door is a marketing figurehead and your case goes to a rotating associate. At Tamou Law Group your defense is handled by a full team of experienced attorneys, not associates, including founding attorney Michael Tamou. Call 623-321-4699, 24/7.
Arizona Statutes Cited on This Page
Statutes link to the official Arizona Revised Statutes at azleg.gov.
Two Arizona Offices, One Team
We serve all of Maricopa County and the surrounding area, with free, confidential consultations 24/7 by phone and in-person meetings at either office by appointment.
Case Results Disclaimer: The results described on this page are based on specific facts and circumstances and do not guarantee or predict a similar outcome in any future case. Every case is different. Past results do not guarantee future results. No attorney-client relationship is formed by viewing this page or submitting a contact form until a written fee agreement has been signed. Tamou Law Group, PLLC is licensed to practice law in the State of Arizona. This website is for informational purposes only and does not constitute legal advice.