Fig. 4.

Cannabinoid last detection times for participants (n = 10) with cutoffs of THC ≥1 μg/L (DRUID), THC ≥2 μg/L (proposed SAMHSA), THC ≥1.5 μg/L, THCCOOH ≥20 ng/L, THC ≥1–2 μg/L + CBD ≥0.5 μg/L, THC ≥1–2 μg/L + CBN ≥1 μg/L, and THC 1–2 μg/L + THCCOOH ≥20, 30, 40, and 50 ng/L

◇, participants whose last positive sample = last collected sample; ◆, participants with defined last positive test (negative sample after last positive). *n = 8; 2 participants with no positives at the cutoff.