"You have to be a good judge of people to understand what it means." "In general we have a choice about which stance we take in life," says Ekman.
"You can see a microexpression, but you have to have more social-emotional intelligence on people to use it accurately," says O'Sullivan.
"The general rule is anything that a person does with their voice or their gesture that doesn't fit the words they are saying can indicate a lie," says Ekman.
"For example, this is going to sound amazing, but it is true.
If we take a trusting stance, life is going to be a lot more pleasant but sometimes we are going to be taken in.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source late 14c., "device to hold a latch of a door," also "a trap;" also "a fishing vessel," from catch (v.). Meaning "that which is caught or worth catching" (later especially of spouses) is from 1590s.
So when a witness to a shooting sat in front of him and tried to tell him that when she heard gunshots she didn't look, she just ran -- he knew she was lying. The answer is by recognizing telltale signs that a person isn't being honest, like inconsistencies in a story, behavior that's different from a person's norm, or too much detail in an explanation.