Blood cannabinoid molar metabolite ratios are superior to blood THC as an indicator of recent cannabis smoking.
Kosnett MJ, Ma M, Dooley G, Wang GS, Friedman K, Brown T, Henthorn TK, Brooks-Russell A. Blood cannabinoid molar metabolite ratios are superior to blood THC as an indicator of recent cannabis smoking. Clin Toxicol (Phila). 2023 05; 61(5):355-362.