Opiods use ttacking seem like one of the potentially less reliable uses for it given legitimate users and high tolerances. It brings to mind a squeaky clean high school in the same pipe as retirement homes and veteran's centers where there are plenty of chronic pain patients and concluding the school must have a drug problem. I am aware that there are statistical levels of usage beyond what would be remotely probable without the area literally being designated for chronic pain patients.

Meanwhile you can't go wrong with looking for disease tracking.