There isn't one. Body language is maybe slightly better than chance but generally unreliable. Exact word choice can be a sign; if you ask them a question do they actually answer it or do they deflect? But fundamentally if you really care you need some independent confirmation.
In Abagnales the bar exam results and prison time should be verifiable, but besides that who knows. I wonder why the FBI wouldn't comment, seems like they should know whether he ever worked there or not.
In Abagnales the bar exam results and prison time should be verifiable, but besides that who knows. I wonder why the FBI wouldn't comment, seems like they should know whether he ever worked there or not.