Herborn, Germany: The presence of THC concentrations in blood is an unreliable predictor of impaired driving efficiency, in keeping with a literature review revealed within the journal Frontiers in Psychiatry.
A crew of investigators from Germany and america reviewed a number of scientific papers revealed over the previous decade assessing the connection between THC blood ranges, driving efficiency, and motorized vehicle accident danger.
They concluded, “[T]right here is not any clear total relationship with THC blood or serum ranges and driving expertise or crash danger. … Not surprisingly, there is no such thing as a unanimous settlement on potential THC authorized cut-off ranges. … Subsequently, the assorted THC concentrations used to outline a cannabis-related driving offense in EU [European Union] international locations and a few US-states various between 1 and as much as 7 ng/ml alone is probably not acceptable to judge driving talent impairment comprehensively.”
The findings are in line with these of numerous other studies and expert review panels concluding that the presence of THC is an unreliable predictor of both current hashish publicity or impairment of efficiency. A 2019 report issued by the Congressional Analysis Service equally determined: “Analysis research have been unable to constantly correlate ranges of marijuana consumption, or THC in an individual’s physique, and ranges of impairment. Thus, some researchers, and the Nationwide Freeway Site visitors Security Administration, have noticed that utilizing a measure of THC as proof of a driver’s impairment is just not supported by scientific proof thus far.”
NORML has lengthy opposed the imposition of THC per se thresholds for cannabinoids in site visitors security laws, opining: “The only real presence of THC and/or its metabolites in blood, notably at low ranges, is an inconsistent and largely inappropriate indicator of psychomotor impairment in hashish consuming topics. … Lawmakers can be suggested to think about different legislative approaches to handle issues over DUI hashish habits that don’t rely solely on the presence of THC or its metabolites in blood or urine as determinants of guilt in a court docket of legislation. In any other case, the imposition of site visitors security legal guidelines could inadvertently change into a felony mechanism for legislation enforcement and prosecutors to punish those that have engaged in legally protected habits and who haven’t posed any actionable site visitors security menace.”
Full textual content of the research, “Hashish use and automobile crashes: A evaluate,” seems in Frontiers in Psychiatry. Extra info relating to hashish and psychomotor efficiency is on the market from NORML.