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- David J. Lieberman is a psychotherapist who helps law-enforcement agents spot liars.
- Lieberman has spent 25 years using science-based techniques to read people's words and actions.
- He says there are no "one-trick-ponies" to catching a liar in the act, but offers several key tells.
You confront a coworker who you suspect may be drinking on the job, or you sit down to speak with an employee who adamantly denies sexual-harassment accusations.
How do you decipher if you're dealing with a liar or someone who's telling the truth?