A police officer's job involves dealing with the public; we interact with them each day. Sometimes that interaction is on a proactive level; most times, we are reacting to something, a crime that was committed or a gut instinct we have regarding someone we contact on the street. Regardless of the reason, our course of action is predicated upon on our perception of the veracity of questions we ask.
During my thirty-three years on the job, I ran across my share of citizens who tried to run a game on me. Sometimes I fell victim to their conniving lies; other times I was able to see right through their unconvincing rhetoric and called them on it. Being able to spot deception, verbally and visually, is important. It can mean the difference between grabbing the right suspect, or best-case scenario, saving a life.
I recently spoke with a former colleague of mine, retired FBI Special Agent Mark Bouton. We talked about the best ways to spot deception and lies. Mark worked the street most of his career not only in the U.S., but also in Puerto Rico and Mexico. After thousands of interviews and interrogations, he became adept at recognizing certain indices of deception. He felt what he'd learned was so valuable he decided to write a book on the subject, How To Spot Lies Like the FBI.
One of the more important topics Mark writes about involves field stops: questioning possible crime suspects or merely suspicious people. This is rudimentary police work; we do it all the time. How often does a guy bolt without us ever having anticipated it? Probably more often than we would care to admit. So how do we gain the advantage, how do we recognize the signs he displays which warn us that he's about to beat feet? Some are easy to spot: looking around instead of looking at us; heart racing for no apparent reason; or perhaps breaking out in a sweat, even though the weather is cold.
Mark warns there are other signs easily recognized as indicators of flight. If your suspect's jaw muscles tighten, his lips compress or form a sneer, or if his face reddens, brace yourself; he's ready to run. Watch his eyes, if they narrow and his eyebrows draw closer together, making a vertical furrow in his forehead, he's about to rabbit. If you see a brief flash of an angry expression, then the suspect suddenly looks calm, be wary of him, as his micro expression has signaled his true feelings, and the more placid mien is a cover-up.
Just as important as facial expressions are clues to lying and deception - body language is an equally good indicator. Being cognizant of how a suspect subconsciously signals he's about to attack is critically important. Signs to watch for that could signal possible aggressiveness include clenched fists, or chin thrust forward or raised and looking down at you. Other signs include posturing with the chest expanded, a sudden big intake of air, or feet moved to a defensive position. A suspect may also blade his body to you as a defensive and offensive fighting position.
When we're involved in an interview or interrogation in a controlled environment, e.g., in the police facility, interpreting body language can be of valuable assistance. Being able to watch the individual's entire body as he responds to questions, as well as immediately after he answers, can offer clear indicators that a suspect is lying. Some of these gestures include involuntary touching of parts of the body. If during or after he answers your question he places a finger or hand over or beside his mouth, he has just subconsciously negated what he's told you. In addition, a liar may get a sweaty or itchy neck during the interview, and when he rubs the back of his neck to alleviate those discomforts, he's sending a clear message that he's just been untruthful.