Aldert Vrij, a psychology professor and leading expert on lie detection, says body language cues are rarely predictive.HIG’s review of the research found that “gaze aversion has never been shown to be a reliable indicator.” They look people in the eyes more often than truth tellers.

2. Don't Rely On Body Language Too Much

Start off with expected questions. This is non-intimidating and gives you info — but more importantly, it gets you a baseline. Then, throw them a question that’s easy for a truth teller to answer but that a liar would not be ready for.For example, ask an underage-looking person at a bar how old they are and you’ll hear a confident “I’m 21.” But what if you asked them, “What’s your date of birth?” That’s an exceedingly easy question for someone telling the truth, but a liar will likely have to pause to do some math. Gotcha

3. Ask Unanticipated Questions

You did your homework in advance, right? Good. Build rapport. Get them talking. Lead them to say something that contradicts the info you dug up.You want to incrementally reveal evidence. Repeated contradictions may get them to simply confess out of embarrassment. More likely it will make their lying increasingly obvious.

4. Use Strategic Evidence

Humans have been trying to master lie detection for thousands of years — and failing miserably. In fact, polygraphs aren’t reliable. With as little as 15 minutes of training, people have been able to consistently beat the test.So is there any way to detect lies based on real science? Actually, yes, and it involves understanding the psychology behind how liars think.

How to tell when someone is lying—and get the truth out of them

You have to get the liar to like you. To open up. To talk a lot. And to make a mistake that reveals their deception. The HIG ( High-Value Detainee InterrogationGroup ) report found that “bad cop” isn’t effective, but “good cop” is. Everybody wants to be treated with respect. And when people are, they’re more likely to talk.

1. Be Nice

If you immediately start questioning what they say or accuse them of lying, not only might they shut down, but they also might start altering their story. Why would you want to help them tell a better lie? The goal is to make them want to put it all out there and paint themselves into a corner.

5. Don't Challenge Them Too Early 

Psychology expert and bestselling author Eric Barker explains how to tell when someone is lying — and get the truth out of them.

1. Be Nice

Similar ideas to 1. Be Nice

1.Always Wear Clean And Ironed Clothes

One on one meetings

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