CHARLOTTE — The North Carolina Advisory Council on Cannabis is considering expanding DWI testing to include marijuana.
Experts told the group on Wednesday that blood testing can help establish recent use, but it needs to be used with other evidence, like driving behavior and field sobriety tests, because tetrahydrocannabinol, or THC, can remain in a driver’s system for weeks after intoxicating effects wear off.
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Currently, there’s no standard roadside test or legal threshold for marijuana impairment.
Although marijuana remains illegal in North Carolina, lawmakers and Gov. Josh Stein have been studying potential legalization, which would necessitate new regulatory structures for traffic safety and driver impairment.