Covering a neck with a hand, raising the inside edge of a foot, compressing the lips—all are signs of tension that has been linked to lying. There is a widespread belief that the body and face are always honest and provides reliable clues to lying—often called “tells”—if you know what to look for. But experts now believe that there a no single behavior indicative of deception, although such so-called nonverbals  should be seen as alerts to possibly concealed or suspicious information that requires further probing.