PRIMARY STUDY

Biomarkers of Recent Cannabis Use in Blood, Oral Fluid and Breath

Key Findings:  This study measured levels of 10 different cannabinoids in the blood, saliva, and breath of frequent versus occasional cannabis users. They were randomized to receive cigarettes containing either a placebo or THC (5.9% or 13.4%). Saliva levels of THC were most sensitive to recent cannabis use but did not lend information on the level or duration of impairment. This work may help develop better biomarker tests for cannabis use and levels of impairment.