Quick: When you think about defensive medicine, what comes to mind? For me, it’s imaging technologies. Try going to your primary care physician’s office on a Friday afternoon and telling her you have a slight pain in your abdomen. You’ll be holding your nose and swigging a barium cocktail in no time as technicians warm up the CT scan machine. You—or, more accurately, your health insurer—will spend a lot of money to find out whether your appendix is about to burst or if that burrito with extra jalapeño peppers you ate last night is to blame.