Roadside drug tests are unreliable, so why are they so widely used in the U.S.? Meanwhile, researchers who make "health disparities" the focus of their work sometimes misrepresent their results. Here's a textbook example from a study that used pulse oximetry to measure disparities in COVID-19 treatment.
drug testing
It is virtually impossible to walk a single block in New York City without seeing stores selling CBD oil. The Drug Gods haven't frowned upon CBD yet because it won't get you high. But CBD frequently contains delta-9-THC, the primary psychotropic component of marijuana, and that will get you high. Can CBD oil get you in trouble? Maybe.