Last verified: March 2026

How Alaska's Cannabis DUI Law Works

Cannabis-related DUI in Alaska is governed by AS 28.35.030 (operating a vehicle, aircraft, or watercraft while under the influence). Unlike some states that set specific THC blood limits (per se limits), Alaska uses an impairment-based standard. This means:

• There is no specific nanogram-per-milliliter threshold for THC in blood
• A conviction requires proof that the driver was actually impaired — that their ability to drive was diminished
• Evidence of impairment includes field sobriety test performance, officer observations, driving behavior, and chemical test results

The impairment-based approach is scientifically sound — THC blood levels do not correlate with impairment as reliably as blood alcohol concentration does for alcohol. However, it also means that a positive THC blood test combined with poor field sobriety test performance can lead to a conviction even at relatively low THC levels.

A person commits the crime of driving while under the influence of an intoxicating liquor, inhalant, or any controlled substance if the person operates or drives a motor vehicle or operates an aircraft or a watercraft while under the influence of an intoxicating liquor, inhalant, or any controlled substance.

AS 28.35.030 — Operating Under the Influence

DUI Penalty Chart

Alaska's DUI penalties are among the most severe in the nation, even for first offenses:

First Offense (Class A Misdemeanor)

Second Offense Within 15 Years (Class A Misdemeanor)

Third Offense Within 15 Years (Class C Felony)

The 72-Hour Mandatory Jail Minimum

Alaska's 72-hour mandatory minimum jail time for a first DUI offense stands out nationally. Most states allow alternatives like community service or home monitoring for first offenses. In Alaska, there is no community service option, no home arrest alternative, and no judicial discretion to waive it. If you are convicted of DUI — whether from alcohol, cannabis, or any controlled substance — you will spend at least 3 days in jail.

Implied Consent

Under AS 28.35.031, by operating a vehicle in Alaska, you automatically consent to chemical testing (blood, breath, or urine) if an officer has reasonable grounds to believe you are impaired. Refusing a test triggers:

• Automatic license revocation for at least 90 days (first refusal)
• The refusal can be used as evidence against you in court
• A warrant may be obtained for a forced blood draw

Drug Recognition Experts (DREs)

Alaska State Troopers and some local police departments have officers trained as Drug Recognition Experts (DREs). These officers are specially trained to identify drug impairment through a standardized 12-step evaluation process that includes:

• Vital signs assessment (pulse, blood pressure, body temperature)
• Eye examination (pupil size, reaction to light, nystagmus)
• Muscle tone assessment
• Modified Romberg balance test
• Walk-and-turn and one-leg-stand tests
• Interview and behavioral observation

A DRE's assessment, combined with chemical test results and driving behavior, forms the prosecution's case for impairment.

Open Container Rules

Alaska's open container laws apply to cannabis as well as alcohol. Cannabis must be transported in a sealed, closed container that is either:

• In the trunk of the vehicle, or
• In a locked glove box or other compartment not accessible to the driver or passengers

An open or recently used cannabis product accessible to the driver can result in additional charges or serve as evidence supporting a DUI investigation.

Watercraft and Aircraft

Alaska's DUI statute (AS 28.35.030) applies to vehicles, aircraft, and watercraft. Operating a boat, floatplane, or snowmachine while impaired carries the same penalties as a motor vehicle DUI. Given Alaska's reliance on bush planes and boats for transportation, this is an especially important consideration.

Note: Waterways are generally under federal jurisdiction. The U.S. Coast Guard enforces federal law on navigable waters, meaning cannabis possession on a boat in federal waters is a federal offense entirely separate from state DUI law.

Practical Tips for Cannabis Users

• Do not drive after consuming. The impairment-based standard means any sign of impairment can lead to arrest, regardless of how much or how little you consumed.
• Wait before driving. Smoking/vaping impairment typically peaks within 15–30 minutes and can last 2–4 hours. Edible impairment can last 6–8 hours or longer.
• Store cannabis properly. Keep it sealed in the trunk or a locked compartment — not in the cup holder or center console.
• Use designated drivers or rideshare. Uber and Lyft are available in Anchorage and Fairbanks. In smaller communities, plan your transportation in advance.

For more on how cannabis affects driving ability, see Driving & Impairment on TryCannabis.org.