Cannabis may impair driving ability for up to 4 hours, study finds | Fox News

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An activist rolls a joint during a protest against the prohibition of bearing a minimum dose of marijuana for personal use, in Bogota on September 6, 2018.

The researchers found participants in the THC group showed a significant decline in Composite Drive Scores related to a 25-minute simulated driving experience.

“Although users in the THC group felt impaired and were hesitant to drive at 30 minutes, by 1 hour-30 minutes they believed the impairment was wearing off and were more willing to drive.

“Per se” laws, establish that a violation occurred if a legal standard was broken.

Lackey also said, “For example, these data show that per se laws for THC levels are not supported scientifically.

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