Marijuana may be legal for adult personal use in Virginia, but that does not make driving after using it legal. The key issue is impairment, not whether marijuana was lawfully possessed or consumed. Virginia prosecutes marijuana-impaired driving under the same DUI statute that covers alcohol, without a set THC limit, which means the case against a driver can be built on officer observations, field sobriety test performance and a blood draw.
Evidence that can lead to a marijuana DUI charge
Virginia does not use a set THC level to prove marijuana impairment. THC, or tetrahydrocannabinol, is the main chemical in marijuana that causes its mind-altering effects. Instead, prosecutors may look at the full picture and argue that marijuana affected the driver’s ability to drive safely.
Evidence in a Virginia marijuana DUI case may include:
- Driving behavior: Unsafe or unusual driving before the stop.
- Officer observations: Signs such as poor coordination, slowed reactions or altered alertness.
- Statements: Comments about marijuana use.
- Field sobriety tests: Test performance that may suggest impairment.
- Blood tests: Results showing THC in the body.
A positive THC test does not always prove impairment when the driving occurred. THC can stay in the body after its effects have worn off, so the timing of marijuana use may matter. The defense may also review the traffic stop, sobriety testing, blood collection and handling of evidence for possible errors.
What happens after a marijuana DUI arrest?
Virginia law treats driving while impaired by marijuana as a DUI, even though marijuana possession is legal. A first offense may lead to:
- Up to one year in jail
- A fine of up to $2,500, with a $250 minimum
- License suspension for up to one year
The criminal DUI case and the administrative license suspension are handled as separate proceedings. Virginia’s implied-consent law may require chemical testing after a lawful DUI arrest. Marijuana cases may involve a blood test because breath tests do not detect THC.
Past DUI convictions can make a new case more serious. A third DUI conviction within 10 years is a Class 6 felony in Virginia and can result in up to five years in prison, with mandatory minimum jail time depending on how recently the prior offenses occurred. Other factors may also increase the penalties, including:
- Having a child passenger in the vehicle
- Causing property damage or injury
- Driving a commercial vehicle
- Being under 21
- Refusing a required chemical test
A defense attorney can review the traffic stop, field sobriety testing and blood collection to determine whether police followed proper procedures.
What to do after a marijuana DUI arrest
Virginia marijuana DUI cases often rely on officer observations and field sobriety tests rather than a set chemical limit. The stop, testing and blood collection can play a key role in the defense. Preserving all available records from the stop onward can provide a clearer picture of what happened.
