420 with CNW — Federally Funded Research Concludes Testing THC Level to Detect Driver Impairment Is Unreliable

Jun 14, 2021

In a bid to reduce the rates of impaired driving as cannabis becomes more accessible, several states have set THC thresholds that bar individuals who have more than a certain amount of THC in their system from driving. The thinking is that, as with alcohol, higher levels of THC in the blood are directly responsible for higher levels of impairment, and establishing a threshold gives law enforcement officials a standard for which they can test to see how impaired an individual is. While it is a noble policy that’s geared towards ensuring safety on the roads, cannabis proponents have long argued that such THC limits are arbitrary and have no scientific backing.

A study funded by the National Institute of Justice (“NIJ”) sought to find the relationship between THC levels and impairment, and the results were quite interesting. After giving basic field sobriety and cognitive tests to 20 individuals who had consumed cannabis, either as edibles or as vapes, the federally funded study found that the amount of THC in an individual’s system…

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