Last verified: March 2026
How Cannabis DUI Is Prosecuted
Driving after smoking weed in New York is prosecuted under Vehicle and Traffic Law Section 1192(4) as "Driving While Ability Impaired by Drugs" (DWAI-Drug). Unlike some states that set a specific THC blood concentration threshold, New York has no per se THC limit.
Instead, prosecution relies on demonstrating impairment through:
- Drug Recognition Expert (DRE) evaluations — specialized officers trained to identify drug impairment through a 12-step protocol
- Standard Field Sobriety Tests — walk-and-turn, one-leg stand, horizontal gaze nystagmus
- Officer observations — driving behavior, physical signs, statements
- Blood or urine testing — if the driver consents or a warrant is obtained
Penalties
| Offense | Fine | Jail | License |
|---|---|---|---|
| First DWAI-Drug | $500–$1,000 | Up to 1 year | 6-month revocation |
| Second (within 10 years) | $1,000–$5,000 | Up to 4 years | 1-year revocation |
| Third+ (felony) | $2,000–$10,000 | Up to 7 years | 1-year revocation |
Open Container Rules
Cannabis must be transported in a sealed, unopened container in a vehicle. An open container of cannabis in the passenger compartment of a motor vehicle can result in a traffic infraction. The safest approach is to keep all cannabis products in the trunk or in their original sealed dispensary packaging.
The Impairment Challenge
Unlike alcohol, there is no widely accepted roadside test for cannabis impairment. THC can remain in blood and urine for days or weeks after use, long after any impairing effects have worn off. This means a positive THC test alone does not prove impairment at the time of driving.
New York's impairment-based approach means that DRE evaluations and officer testimony carry significant weight in court. If you are stopped and an officer suspects cannabis impairment, you have the right to an attorney. Refusing a chemical test can result in license revocation under New York's implied consent law.
Never drive while impaired by cannabis. If you consume, arrange alternative transportation. Ride-sharing services operate throughout New York City and most urban areas. Penalties are severe and a conviction creates a permanent criminal record.
For in-depth cannabis education, dosing guides, safety information, and research summaries, visit our partner site TryCannabis.org