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The “residual high” scare is being exposed as a total myth, and the latest science is proving it with cold, hard data. While lawmakers continue to lean on the “danger” of impaired driving to stall reform, a new study published in the Journal of Cannabis Research just confirmed that cannabis consumers show zero next-day driving impairment. Despite having trace levels of THC still in their blood 12 to 15 hours after use, regular consumers performed exactly like those who had never touched the plant.
This data exposes a massive, systemic flaw in how the government handles “impaired driving” and DUI enforcement. Currently, many states use arbitrary blood-THC limits to hand out criminal charges, but this study found that neither blood nor oral fluid levels of THC or CBD had any actual correlation with driving ability. This mirrors a recent UC San Diego study where nearly half of the participants tested positive for THC after 48 hours of abstinence yet drove perfectly. It turns out, the “biological evidence” the police are looking for doesn’t actually measure if you’re high—it just measures if you enjoyed yourself two days ago. Read the original article.
Original article written and published by NORML on March 12, 2026.
