Pyschological strength is essential; this is a fundamental quality of a con artist.
Chris had a trick up his sleeve; his method was to treat everyone he intended to deceive as a fool. If you think of your target as a fool, naturally, your psychological fortitude improves.
"Hello, I am Agent Ben Harvey from the National Security Agency's Major Crimes Investigation Division."
Dressed in a suit, Chris produced his credentials, which he flashed before a female police officer without actually handing them over for a thorough inspection. Instead, she merely glanced at Chris's ID and met his gaze with a smile, saying, "Hello, Agent Harvey."
Taking the cue, Chris put his ID away in his pocket, then said solemnly, "I request to see your Superintendent Hart, and if Superintendent Hart isn't available, I'd be willing to see Mr. Pence from the Serious and Organized Crime Unit."