Lie detector

Lie detector is the sort of product people think about when they want to check whether someone is telling the truth, which makes it part prop, part serious sensing device. By our assessment, its strongest appeal is that it turns an abstract wish into a machine with dials, lights, or readouts, depending on the type. The hard limit is that truth itself is not neatly measured by one gadget, so this category sits under a lot of skepticism in real life. In practice, a lie detector is more about procedure, interpretation, and the setting around it than about a clean yes-or-no answer. It belongs to a very different world than ordinary consumer products, and most people know it more from crime stories and TV than from daily use.