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Edibles Impair Driving Long After Legal Limits
4 Sep
Summary
- Edible THC impairs driving for hours, study finds.
- THC blood levels below legal limits still cause issues.
- Drivers struggle with lane control and reaction time.
New research highlights that consuming THC edibles can severely affect driving abilities for several hours, despite blood THC concentrations remaining below legal thresholds. A study involving 40 regular cannabis users tested their performance on a driving simulator after consuming gummies with 0, 2, 10, or 20 milligrams of THC.
Participants who ingested 10mg and 20mg doses showed impaired lane control and slower reaction times at two and five hours post-consumption. Notably, their blood THC levels averaged between 1.6 and 3.4 nanograms per milliliter, falling below the common 5 ng/mL legal cutoff.
This delayed absorption and prolonged impairment from edibles present a significant challenge for law enforcement. Standard blood tests may fail to identify unsafe drivers, prompting a search for more reliable roadside detection tools. The study noted minimal residual effects after 24 hours, though subjective feelings of intoxication had faded.
