Last verified: March 2026

How Virginia's Cannabis DUI Law Works

Cannabis-impaired driving in Virginia is prosecuted under § 18.2-266 of the Code of Virginia, the same statute that governs alcohol DUI. Like a growing number of states, Virginia does not set a "per se" THC blood concentration that automatically constitutes impairment. There is no cannabis equivalent to the 0.08% blood alcohol limit.

Instead, Virginia uses an impairment-based approach. Prosecutors must demonstrate that the driver was actually impaired by cannabis while operating a vehicle, based on the totality of evidence.

It shall be unlawful for any person to drive or operate any motor vehicle, engine, or train while such person is under the influence of any narcotic drug or any other self-administered intoxicant or drug of whatsoever nature.

Code of Virginia § 18.2-266

How Cannabis DUI Is Investigated

Step 1: Traffic Stop and Initial Observations

An officer observes driving behavior suggesting impairment — weaving, erratic speed changes, failure to signal, delayed reactions at traffic lights, or other signs. After making contact, the officer looks for indicators of cannabis impairment: red eyes, odor of cannabis, slowed speech, impaired coordination, and difficulty processing instructions.

Step 2: Field Sobriety Tests (FSTs)

If the officer suspects impairment, they may administer standardized field sobriety tests including the walk-and-turn test, one-leg stand, horizontal gaze nystagmus (HGN), and other balance and coordination assessments. These tests provide documented observations of impairment.

Step 3: Blood Testing

A blood draw may be requested to detect the presence of THC and its metabolites. Unlike alcohol breath tests, cannabis testing in Virginia relies on blood samples. The results show the presence and concentration of THC, but because Virginia has no per se limit, the blood test alone does not establish guilt — it corroborates the officer's impairment observations.

Step 4: Prosecution

Prosecutors build the case using the officer's testimony, field sobriety test results, blood test evidence, dashcam or bodycam footage, and any other relevant observations. The standard is whether the totality of evidence proves the driver was impaired by cannabis while operating the vehicle.

DUI Penalty Chart

First Offense

Second Offense (Within 5–10 Years)

Third Offense (Within 10 Years)

Implied Consent

Virginia's implied consent law means that by driving on Virginia roads, you have automatically consented to chemical testing (blood draw) if an officer has probable cause to believe you are driving under the influence. Refusing a blood test triggers:

• First refusal: Automatic 1-year license suspension (administrative, separate from any DUI penalty)
• Second refusal: 3-year suspension and a Class 1 misdemeanor charge
• The refusal itself can be used as evidence against you in the DUI prosecution
• Refusal penalties apply even if you are ultimately acquitted of the DUI charge

Medical Cannabis Card Is Not a Defense

Having a valid Virginia medical cannabis certification provides no defense against a DUI charge. Even if you are legally authorized to use cannabis for a medical condition, you cannot legally drive while impaired. The employment protections under § 40.1-27.4 do not extend to operating a motor vehicle.

Open Container and Storage

When transporting cannabis in a vehicle:

• Keep cannabis in a sealed, closed container
• Store it in the trunk or a locked compartment that is not accessible to the driver or passengers
• Never consume cannabis in a vehicle — not as a driver, not as a passenger, not while the vehicle is parked
• The odor of cannabis alone may give officers reasonable suspicion to investigate further

Practical Tips

• Wait before driving. THC impairment from smoking typically peaks within 15 to 30 minutes and can last 2 to 4 hours. Edibles can impair for 6 to 8 hours or longer.
• Use rideshare services. Uber, Lyft, and taxis are widely available in Virginia's urban areas. A $15 rideshare is far cheaper than a DUI.
• Store cannabis in the trunk. Keep all products sealed and out of reach.
• Understand the $250 minimum. Even a first-offense DUI carries a $250 minimum fine, 1-year license suspension, and mandatory VASAP enrollment. The total cost of a DUI — including legal fees, insurance increases, and lost time — typically exceeds $10,000.

For more on how cannabis affects driving ability and reaction time, visit Driving & Impairment on TryCannabis.org.

Official Sources

• § 18.2-266 — Virginia DUI Statute
• Virginia Cannabis Control Authority
• Cannabis Control Act — Title 4.1, Subtitle II