Visual Cues

I think if I were going to deal drugs, I’d pat down, or outright strip, each potential buyer before I’d sell anything to him or her. Okay; I guess maybe that wouldn’t always be practical. But something I’d definitely do is have every person remove his or her hat before we conducted business -- because while loads of folks wear baseball caps, only a handful of them will toss them off their heads as a distress signal when they’re working an undercover operation.