About 60% of CBD products tested in the lab also contain THC (tetrahydrocannabinol), the chemical in pot that causes intoxication, researchers report in the journal Drug and Alcohol Dependence.  Most products contained just trace amounts of THC, but those are enough to accumulate in your body and cause you to fail a drug test, said senior researcher Shanna Babalonis, an assistant professor of behavioral science at the University of Kentucky College of Medicine.