Study Finds THC Detected in Blood or Breath Does Not Indicate Impairment

Study Finds THC Detected in Blood or Breath Does Not Indicate Impairment
High Times

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 driver may have in their blood, similar to the 0.08% blood alcohol concentration limit in effect nationwide. Critics of per se limits on THC concentrations in blood or breath have argued that such limits have little bearing on the level of impairment or intoxication, which can vary widely from person to person despite similar levels of THC concentration. “These findings provide further evidence that single measurements of specific delta-9-THC blood concentrations do not correlate with impairment, and that the use of per se legal limits for delta-9-THC is not scientifically justifiable at the present time,” wrote the authors of the study published by the journal Scientific Reports. To conduct the study, the researchers recruited a group of test subjects, most of whom were daily cannabis users. The scientists then determined the THC levels in their blood and breath prior to and after inhaling cannabis. Before inhaling cannabis, most subjects had residual THC levels of 5ng/ml or higher, which exceeds the per se legal limit in several states. The authors noted that THC at such levels was detected despite “the absence of any impairment.” After the test subjects inhaled the cannabis, the researchers noted an inverse relationship between THC blood levels…

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Source : Study Finds THC Detected in Blood or Breath Does Not Indicate Impairment

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