Fig. 1From: Study of Δ9-tetrahydrocannabinol (THC) and cannabidiol (CBD) extraction FROM dried oral fluid spots (DOFS) and LC–MS/MS detectionCBD and THC chromatographic separation at 8.22 and 9.13 min, respectively. The chromatogram was extracted from an injection of a methanolic solution at 25 ng/mLBack to article page