Lie to Me (2009)

A cynical researcher who's made a profession of interpreting facial expressions and body language to determine whether someone is telling the truth heads up a consulting firm that includes a perceptive, optimistic female clinical psychologist on whom he harbors a secret crush, a former TSA screener who can spot smugglers and a young man unable to tell a lie. Together, they help solve mysteries for the police and the FBI as well as their private clients.