02/26/2026
In a peer-reviewed paper published by the Humboldt Journal of Social Relations, NORML’s Deputy Director Paul Armentano wrote: “The sole presence of THC and/or its metabolites in blood, particularly at low levels, is an inconsistent and largely inappropriate indicator of psychomotor impairment in cannabis consuming subjects. … Lawmakers would be advised to consider alternative legislative approaches to address concerns over DUI cannabis behavior that do not rely solely on the presence of THC or its metabolites in blood or urine as determinants of guilt in a court of law. Otherwise, the imposition of traffic safety laws may inadvertently become a criminal mechanism for law enforcement and prosecutors to punish those who have engaged in legally protected behavior and who have not posed any actionable traffic safety threat.”
🚫 "There are no empirically supported thresholds for blood or oral fluids that reliably indicate cannabis impairment," investigators concluded. That finding is consistent with the opinions of numerous scientists and traffic safety groups, including the National Highway Traffic Safety Administration and the American Automobile Association.
👉️ Read more: https://norml.org/news/2026/02/12/review-thc-concentrations-are-unreliable-indicators-of-driving-impairment/
