Operating a vehicle under the influence of cannabis is a criminal offense in Maine, governed by Maine Title 29-A M.R.S. (motor vehicles) and enforced as an OUI (Operating Under the Influence) offense. Maine does not have a per-se THC blood limit; impairment is determined by officer evaluation and drug recognition expert assessment.
The Maine OUI standard
Maine OUI law treats operation of a motor vehicle while impaired by any substance, including cannabis, as a criminal offense. Maine does not have a per-se THC blood limit (unlike some other states with cannabis blood-content thresholds). Impairment is determined by officer evaluation, field sobriety tests, and drug recognition expert assessment.
Penalties
Maine OUI penalties scale with prior offenses and aggravating factors. First-offense OUI penalties include fines, license suspension, and possible jail time. Refer to Title 29-A for current penalty schedules. Penalties are revised periodically by the Maine Legislature.
The conservative practice
Cannabis Cured advises customers to plan transportation before consumption. If you are unsure whether you are impaired, do not drive. The general guideline among consumer-safety organizations is to wait at least 4-6 hours after smoking or vaping, and 8-12 hours after consuming edibles, before driving. Individual response varies.
Maine open-container
Maine prohibits open containers of cannabis in the driver-accessible area of a motor vehicle. Cannabis must be in a sealed package in the trunk or non-driver-accessible storage.
Frequently asked
Is there a Maine THC blood-content limit?
Maine does not have a per-se THC blood limit. Impairment is determined by officer evaluation rather than a fixed THC number. Some other states have set per-se limits at 5 ng/mL, Maine has not.
How long after consuming Maine cannabis can I drive?
There is no universal rule. Plan transportation before consumption. Consumer-safety organizations generally suggest 4-6 hours after smoking and 8-12 hours after edibles, but individual response varies.
Where should I store cannabis when driving in Maine?
Maine prohibits open cannabis containers in driver-accessible areas. Store cannabis in a sealed package in the trunk or in non-driver-accessible storage.