Lie detection systems go high-tech

"Move your eyes, blink, smile. Now try to relax," she says. "We will see if you are a good or bad liar shortly."

Prof Hanein and colleague Prof Dino Levy lead a team at Israel's Tel Aviv University that have developed a new method of lie detection.

They say they have identified two types of liars - those who involuntarily move their eyebrows when they tell a fib, and those that cannot control a very slight lip movement where their lips meet their cheeks.

Their software and its algorithm can now detect 73% of lies and they intend to improve that as they develop the system. "When you try to conceal a lie, one of the things you try to avoid is any sort of body reaction," she says.

Prof Levy adds: "But it's very, very hard for you to conceal a lie with this technology."

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