People who are highly skilled in identifying "micromomentary" facial expressions are also more accurate in judging lying. In testing college students, psychiatrists, polygraphists, court judges, police officers and Secret Service agents on their ability to detect lies, only the agents, trained to look for subtle cues, scored above chance.Here's a fascinating article by Malcolm Gladwell (a redundant statement IMO!) about reading people's faces.
Some years ago, John Yarbrough was working patrol for the Los Angeles County Sheriff's Department. It was about two in the morning. He and his partner were in the Willowbrook section of South Central Los Angeles, and they pulled over a sports car. "Dark, nighttime, average stop," Yarbrough recalls. "Patrol for me was like going hunting. At that time of night in the area I was working, there was a lot of criminal activity, and hardly anyone had a driver's license. Almost everyone had something intoxicating in the car. We stopped drunk drivers all the time. You're hunting for guns or lots of dope, or suspects wanted for major things. You look at someone and you get an instinctive reaction. And the longer you've been working the stronger that instinctive reaction is."Yarbrough was driving, and in a two-man patrol car the procedure is for the driver to make the approach and the officer on the passenger side to provide backup. He opened the door and stepped out onto the street, walking toward the vehicle with his weapon drawn. Suddenly, a man jumped out of the passenger side and pointed a gun directly at him. The two of them froze, separated by no more than a few yards. "There was a tree behind him, to his right," Yarbrough recalls. "He was about seventeen. He had the gun in his right hand. He was on the curb side. I was on the other side, facing him. It was just a matter of who was going to shoot first. I remember it clear as day. But for some reason I didn't shoot him." Yarbrough is an ex-marine with close-cropped graying hair and a small mustache, and he speaks in measured tones. "Is he a danger? Sure. He's standing there with a gun, and what person in his right mind does that facing a uniformed armed policeman? If you looked at it logically, I should have shot him. But logic had nothing to do with it. Something just didn't feel right. It was a gut reaction not to shoot— a hunch that at that exact moment he was not an imminent threat to me." So Yarbrough stopped, and, sure enough, so did the kid. He pointed a gun at an armed policeman on a dark street in South Central L.A., and then backed down. ...