Study: Elevated THC Blood Levels Persist for Days in Habitual Cannabis Consumers

By Paul Armentano, NORML

VICTORIA, AUSTRALIAblood — 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.

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