How reliable is the lie detector technology?
She says: 'Roll your eyes, blink your eyelids, smile. Now try to relax. We'll see if you're right or wrong. "
Hanin and his colleague Professor are leading a team at Tel Aviv University in Israel. This team has developed a new way to detect lies.
He says he has identified two types of liars. One is the people who inadvertently raise their eyebrows when they lie. And there are others who can't control the slightest movement of the lips where their lips meet their cheeks.
Their software and its algorithm can now detect 73% of lies and they are working to improve the system. She says: "When you try to hide a lie, one of the things you try to avoid is any kind of physical reaction."
Professor Levy added: "But it's very difficult for you to hide lies with this technology."
Methods of detecting lies probably existed as long as long stories were told. One of the first documented examples is of China where a suspect had to fill his mouth with dry rice a thousand years ago.
After a while, the grain would be tested and if it remained dry, the person would be found guilty. The idea was that if a person really lied, he would be frightened or terrified, and because of this his mouth would be dry and the rice would be dry.
The first lie detector or polygraph was invented in the early 20th century. The most famous of these is the 'analog polygraph', which usually consists of three or four ink-filled needles that dance round on a strip of moving paper.
Sensors are attached to the suspect's fingers, arms and body and then the machine measures his breathing speed, pulse, blood pressure and sweat and in this case he answers many questions.
Yet there have been constant concerns about the accuracy of these machines, whether they could be fooled. That's why researchers and technology firms around the world are working to develop more high-tech polygraph systems.
At the University of Erasmus in Rotterdam, the Netherlands, Dr. Sebastian Spear and his team are using an MRI (magnetic resonance imaging) machine to determine if someone is lying or cheating. They do this by looking at color changes in brain scans in response to questions.
Says Dr. Spear: "Basically we look at different parts of [the brain] when someone decides to cheat or be honest they move more strongly [bright on the scan]."
A high-tech system for detecting lies is already in use at Converse, an Ottawa company. It focuses on the involuntary movement of the eyes to detect lies.
The person being tested for a lie is asked to answer a number of true or false, yes or no questions. When they do, eye-tracking software observes and studies their reactions. The result is then provided within five minutes, and it claims to be 86-88% accurate.
Conveyors says iDatect is now used by more than 600 users in 50 countries, including 65 U.S. law enforcement agencies and about 100 more agencies worldwide.
Chief executive Todd McClelson says the test is being used by authorities and firms to examine a number of factors: past offenses, past or present drug use, undisclosed disciplinary action, employment. Lying on a CV and having links with terrorists can also be traced.
Police detectives, meanwhile, can use I-detect to ask specific questions about a crime.
However, it is very important that the legal status of liars is in accordance with the system of each country.
Polygraphs in the UK have been using it since 2014 through the Probation Service to 'Manage Sexual Offenders'. And now they are being tried for domestic abuse.
But the results of the polygraph test are based on three different legal systems in the UK. Cannot be used in criminal cases in England and Wales, Scotland and Northern Ireland.
UK employers are allowed to conduct staff lie detection tests but this should be optional.