Study: Elevated THC/Blood Levels Persist in Habitual Cannabis Consumers

VICTORIA, AUSTRALIA — The presence of THC may persist in the blood of habitual cannabis consumers for multiple days at concentrations above 5ng/ml, according clinical data recently published in the journal Forensic Science International.

Australian researchers assessed daily concentrations of THC in the blood of 21 subjects over a period of 7 days of monitored abstinence. Subjects reported having engaging in the “heavy” use of cannabis during the months leading up to the study.

Of the 11 participants who completed the entire 7-day…