I know someone who kind of got caught by this. One of the big problems now is not just traditional weed, but a lot of the CBD distilled products that were federally legalized in 2018. So-called "delta 8" THC, which is usually vaped, is legal to buy at a lot of CBD stores.
HOWEVER, the urine drug test looks for metabolites of THC, not THC itself. The traditional weed THC (delta-9) and the widely legal and less potent delta-8 produce the same metabolites in urine and delta-8 can stay in the body longer since it is a distillation being vaped.
A lot of the problem is not truckers driving high, you have dudes that did weed or delta-8 30 days ago but still test positive due to body mass, poor diet/exercise, etc. It literally is one of the worst ways to lose your job for posing no threat to any one.
Watch out for Detox 2023. I will be dropping a product that will help with THC-COOH clearance out of the visceral fat and out of the kidneys as well . Wait on it .