50ng flags a screen, 15ng confirms analysis. So no CBD. Won't do squat for you anyway. The real deal nowadays? 1-3 months separation for squeaky clean again on anything resembling routine use, 40 or past. Telltale metabolites linger in aging fat. If it's a one off excursion, I'd wait at least 2-3 weeks and test discretely before rolling dice on a DOT submission. No longer in the game? Be mindful of concentrates, don't just rush out to Chipotle in the Miata until there's some tolerance. Lots of folks around thinking weed can't hook. Untrue.