A new study published this month adds further evidence that levels of THC detected in the blood or breath of cannabis users is not a reliable indicator of impairment. Researchers also found that levels of THC in blood and breath did not provide reliable evidence of how recently a test subject had used cannabis.
In their introduction to the study, the researchers noted that “finding an objective measure of recent cannabis use that correlates with impairment has proven to be an elusive goal.” Some states have enacted laws that set per se legal limits on the amount of THC a
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