What can 20,000+ polygraph tests teach us about lying, truth, and human behavior? Polygraph examiner David Goldberg joins How to Be a Person to explain how lie detector tests actually work, what they measure, how accurate they can be, and why the person administering the test may matter just as much as the machine itself.

David is an Advanced Board-Certified polygraph examiner and founder of Executive Protection Group Polygraph Service. Over the course of his career, he has conducted more than 20,000 polygraph examinations involving everything from criminal investigations and employment screenings to infidelity, false accusations, sexual assault, custody disputes, and other situations where figuring out what actually happened can have enormous consequences.

And according to David, much of what people think they know about polygraphs comes from TV and movies... and bears little resemblance to an actual examination.

In this conversation, David walks through what really happens during a polygraph test, why the questions are discussed beforehand, what physiological responses are actually being measured, and whether someone can remain calm enough to fool the test.

He also explains why the accuracy of a polygraph can depend so heavily on the examiner. Experience, interviewing ability, question formulation, ethics, and interpretation can all play a role in the final result.

The conversation also gets into some fascinating questions about lying itself. Does your brain know when you're lying even if you've convinced yourself something is true? Can highly manipulative people fool a polygraph? Can you beat the machine, or are you really trying to beat the examiner? And after more than 20,000 examinations, what has David learned about the way people lie?

It's a fascinating look inside a profession most of us have only seen portrayed on a screen, from someone who has spent decades sitting across from people when the truth really matters.

And if you enjoy this episode, hit subscribe to drop in on more of these conversations.

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