" We also need a wound that looks convincing. We need Dendoncker to believe it’s real. Even if only for a minute.” “No problem there, either. When operatives go undercover they often use a false wound to hide a handcuff key or a blade. That way, they have it even if they get captured and stripped. It works, even if they get searched. Psychology 101. Humans instinctively avoid contact with wounds. You can get the stuff from the place that sells the fake blood. I’ll add some to the order. "

― Lee Child , Better off Dead (Jack Reacher, #26)