Table V.

Mean Detection Times and Ranges of THC and THC Metabolites in Whole Blood by THC Dose (10, 25 mg) and Inhalation Method (Smoked and Vaporized)

Dose (mg)	THCCOOH ELISA (cutoff = 10 ng/mL)	THC LC–MS-MS (LOQ = 1 ng/mL)	11-OH-THC, LC–MS-MS (LOQ = 1 ng/mL)	THCCOOH LC–MS-MS (LOQ = 1 ng/mL)	THCCOOH-GLUC LC–MS-MS (LOQ = 1 ng/mL)
Smoked: Detection time (h) to first positive
10	0.43 (0.17–1.0)	0.17 (0.17–0.17)	0.17 (0.17–0.17)	0.17 (0.17–0.17)	0.82 (0.17–4.0)
25	0.17 (0.17–0.17)	0.17 (0.17–0.17)	0.20 (0.17–0.5)	0.17 (0.17–0.17)	0.36 (0.17–1.0)
Smoked: Detection time (h) to last positive
10	5.29 (1.0–8.0)	1.0 (0.17–2.0)	0.28 (0.17–0.5)	5.51 (0.17–8.0)	6.71 (1.50–8.0)
25	6.56 (0.17–8.0)	2.27 (0.5–4.0)	1.64 (0.17–2.0)	7.71 (6.0–8.0)	7.87 (6.0–8.0)
Vaporized: Detection time (h) to first positive
10	0.24 (0.17–0.5)	0.19 (0.17–0.5)	0.17 (0.17–0.17)	0.17 (0.17–0.17)	0.29 (0.17–1.0)
25	0.27 (0.17–1.0)	0.17 (0.17–0.17)	0.17 (0.17–0.17)	0.17 (0.17–0.17)	0.34 (0.17–1.0)
Vaporized: Detection time (h) to last positive
10	6.75 (1.5–8.0)	1.84 (0.5–3.0)	1.11 (0.17–2.0)	6.94 (5.0–8.0)	7.67 (5.0–8.0)
25	6.59 (3.0–8.0)	2.27 (0.17–3.0)	1.58 (0.5–3.0)	7.89 (6.0–8.0)	8.0 (8.0–8.0)