How did Newberry reach this conclusion? The answer is by recognizing telltale signs that a person isn't being honest, like inconsistencies in a story, behaviour that's different from a person's norm, or too much detail in an explanation.
While using these signs to catch a liar takes extensive training and practice, it's no longer only for authorities like Newberry. You can become adept at identifying dishonesty, and it's not as hard as you might think. Experts explain the top 10 ways to let the truth be known in the following link: