Arkansas Cannabis DUI — Ark. Code § 5-65-103 (No Per Se Limit)

Last verified: May 2026

The Legal Standard: Substantial Impairment

Arkansas’s drugged-driving statute, Ark. Code § 5-65-103, is the same statute that governs alcohol DWI. There is no separate "cannabis DUI" charge. To convict, the state must prove that the defendant was "intoxicated" — defined in § 5-65-102(b)(2) as "controlled or affected ... to such a degree that the driver’s reactions, motor skills, and judgment are substantially altered, and the driver, therefore, constitutes a clear and substantial danger of physical injury or death to himself and other motorists or pedestrians."

This impairment-based standard is more favorable to defendants than per se metabolite statutes used in Indiana, Iowa, and Pennsylvania. The mere presence of THC or its metabolites in blood is not automatically sufficient. Prosecutors typically combine the arresting officer’s observations, Standardized Field Sobriety Test (SFST) results, evaluation by a Drug Recognition Expert (DRE), and chemical-test results — together — to satisfy the substantial-impairment standard.

Implied Consent

Ark. Code § 5-65-202 imposes implied consent: any driver on Arkansas roads is deemed to have consented to chemical testing (blood, breath, or urine) when an officer has reasonable cause to believe the driver is operating a vehicle while intoxicated. Refusing a chemical test results in an automatic 180-day driver’s license suspension on a first refusal (Ark. Code § 5-65-205). Refusal is also admissible at trial as evidence of consciousness of guilt (Spicer v. State, 32 Ark. App. 209).

Penalty Schedule

The Medical-Card Non-Defense

Two statutory provisions explicitly bar using a medical-marijuana card as a defense:

• § 5-65-102(B): "the fact that a person is or has been entitled to use a drug or controlled substance under the laws of this state does not constitute a defense."
• Amendment 98 § 3(c): the medical-marijuana amendment itself preserves DUI prosecution against cardholders driving while substantially impaired.

The result: an Arkansas medical-marijuana cardholder who legally consumed a 10mg edible the night before, has no active impairment, and registers detectable inactive THC metabolites in a chemical test, can still be charged with DUI if the prosecution can stack SFST observations and DRE testimony onto the chemical-test result. The card affects nothing in the DUI calculus.

No Plea-Bargaining Down

Ark. Code § 5-65-107 statutorily prohibits plea-bargaining DWI charges down to non-DWI offenses. Prosecutors who would in another state reduce a DUI to "reckless driving" or "operating while impaired" have no authority to do so in Arkansas. The first-DWI conviction therefore typically results in the full statutory minimum.

The Practitioner’s Conundrum

For Amendment 98 patients, the Arkansas DUI architecture creates a real practical risk:

• THC metabolites linger. Inactive 11-nor-THC-COOH metabolites can be detectable for days to weeks after last use, particularly in chronic patients.
• Officer-discretion-driven enforcement. Without a per se cutoff, the question is whether the officer’s observations and the DRE’s assessment establish substantial impairment. SFST tests — designed for alcohol — have well-documented limitations on cannabis users.
• Ignition-interlock device (IID) on first offense. Even on a first DWI, IID is mandatory on reinstatement, an out-of-pocket cost typically $70–$150/month for the IID period.
• Cumulative effect. Two DWIs within 5 years pushes the suspension to 24 months. Three within 5 years is 30 months. A fourth within 5 years is a Class D felony.

Practical Guidance for Patients

• Do not drive while actively impaired by cannabis. The legal threshold is "substantially altered" reactions and judgment — subjective and officer-driven.
• Refusing a chemical test is a separate sanction (180-day suspension automatic) and admissible at trial. The strategy of refusal is rarely a winning one in Arkansas.
• Carry medical documentation but do not rely on the card for any DUI defense.
• If stopped and asked about cannabis use, decline to answer and request counsel before any field-sobriety test where possible.
• Any DUI conviction triggers a permanent record visible on background checks and insurance ratings; the cumulative cost (fines, court costs, IID, insurance, license-suspension implications) typically exceeds $5,000 for a first offense.

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