In a study performed by Paul Ekman and Maureen O’Sullivan that was published in American Psychologist, it was found that Law enforcement officials — including judges — performed no better than the average person in detecting deception. Only members of the U.S. Secret Service consistently fared better than the average person’s 54% accuracy. The scores for the U.S. Secret Service were only marginally higher at 57%.
This has been verified by other studies. These studies tell us that the average person has a 54% chance of accurately detecting lies. Judges and Policemen have been shown statistically, to fare no better than the average person.