Here's exactly how I spot a liar, says ex-CIA officer: It can be very 'revealing'

TL;DR

There is no single physical response linked to lying; polygraph tests measure physiological stress, not deception.
A key strategy is 'trust, but verify,' which involves collecting information from various sources and observing behavior over time.
When immediate judgment is necessary, pause and assess by considering potential risks, ulterior motives, expertise, verifiability, and false urgency.
Start small in interactions to gather more information and gauge trustworthiness before committing to larger decisions.
If unsure about someone's trustworthiness after using these strategies, it is best to say 'no' and disengage.

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