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UK News Polygraphs for terrorists: do lie detectors work?

14:51  21 january  2020
14:51  21 january  2020 Source:   theweek.co.uk

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  Government 100% committed to making Martyn’s Law a reality, minister says The proposals would force public venues to incorporate specific counter-terrorism plans into their safety regime. Her son Martyn Hett, 29, died in the atrocity at the end of an Ariane Grande concert in May 2017, which also injured hundreds others. © Provided by PA Media Figen Murray (centre) wants to save lives with introduction of Martyn’s Law (Kim Pilling/PA) Earlier this week, Manchester City Council said it was prepared to “enshrine the principles” of Martyn’s Law into future regulations.

A lie detector , or polygraph , monitors several physical reactions in the person undergoing the test. HowStuffWorks looks at how polygraphs work . ­You hear about lie detectors all the time in police investigations, and sometimes a person applying for a job will have to undergo a polygraph test (for

This video reviews the evidence supporting and refuting the accuracy of polygraphs ( lie detector test). The use of polygraphs for any application is

a man holding a pair of people in uniform © Provided by The Week

Terrorists may be forced to sit polygraph tests to prove that they are not planning to commit further attacks, under new government plans.

The proposals for polygraph testing are part of a raft of reforms that Boris Johnson hopes to introduce in the wake of November’s London Bridge attack.

The prime minister is also pushing for tougher sentences that would see individuals convicted of plotting terrorist attacks or running a terror organisation facing a minimum of 14 years in prison.

Commenting on the polygraph tests plan on Sky News’s Kay Burley @ Breakfast show, Justice Secretary Robert Buckland said that lie detectors could help to identify terror offenders who are “in effect sleepers for many years”.

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Lie detector tests have become a popular cultural icon — from crime Several questioning techniques are commonly used in polygraph tests. The most widely used test format for One reason that polygraph tests may appear to be accurate is that subjects who believe that the test works and that

A polygraph , popularly referred to as a lie detector test, is a device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration

How would the tests be used?

The polygraph tests would be used primarily to determine whether individuals convicted of terrorist offences are attempting to trick deradicalisation officers in order to get early release from jail.

London Bridge attacker Usman Khan, 28, had been released on licence in December 2018 after completing a deradicalisation programme in jail following a conviction for plotting to bomb the London Stock Exchange.

Justice Secretary Buckland told Sky presenter Burley that “we get a lot of people who are superficially very compliant with the regime”, but then “back come the hatreds and the prejudices and we see atrocities like the one we did” at London Bridge.

The lie testing devices are already being used to monitor registered sex offenders, under measures introduced in 2014 by the Conservative-Liberal Democrat coalition government.

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Nope, polygraphs cannot tell whether you're lying . 1, 2. The polygraphs try to measure nervousness by registering sweating, breathing, blood pressure/pulse, and (I think) light trembling. They always calibrate the polygraph for each individual by asking questions the subject has no reason to lie about

Convicted terrorists will face lie - detector tests under a raft of measures drawn up in the wake of the most The number of counter- terrorism specialist probation officers will double and they will work to a set Polygraphs , commonly known as lie - detector tests, remain inadmissible in UK courts but their

According to the gov.uk website, sex offenders are required to take the test every six months, and “if found to have been covering up inappropriate behaviour”, are likely to be recalled to prison.

How do lie detectors work?

According to science website howstuffworks.com, polygraph tests work by monitoring a person’s breathing rate, pulse, blood pressure and perspiration.

The four “signifiers” are measured using between four and six sensors attached to the person, with the results recorded on a moving piece of graph paper. The subject is asked four simple questions, to establish their norms, before questioning begins.

Once the questioning has been completed, a polygraph examiner looks at the graphs to check whether the vital signs changed significantly at any point.

“In general, a significant change (such as a faster heart rate, higher blood pressure, increased perspiration) indicates that the person is lying,” says the site.

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Polygraphs are often used in fiction, but also sometimes in court or by government agencies and corporations. Are there scientific studies on the accuracy of lie detection using polygraphs ? How do they compare to experiences interrogators using just their observations, without recorded

Polygraphs are often used in fiction, but also sometimes in court or by government agencies and corporations. Are there scientific studies on the accuracy of lie detection using polygraphs ? How do they compare to experiences interrogators using just their observations, without recorded

So how accurate are they?

Howstuffworks says that if “a well-trained examiner uses a polygraph, he or she can detect lying with high accuracy”.

However, given that the examiner’s judgement is subjective, it is possible to fool the test.

According to The Washington Times, a former Oklahoma City police officer was sentenced in 2015 to two years in jail for teaching clients how to “conceal misconduct and other disqualifying information” when taking polygraph tests.

Indeed, the accuracy levels of the tests have been found to be as low as 60%, reports Sky News.

When challenged over those statistics, Buckland said: I’m not pretending on their own, polygraphs, lie detectors, are the be-all-and-end-all, which is why what we are also doing is doubling the number of specialised counterterrorism probation officers... improving training, getting more psychologists in there, specialist imams as well will be working with these people.”

All the same, the widespread use of lie detector tests in both Britain and other countries has triggered concern among experts including Leonard Saxe, a psychologist at Massachusetts-based Brandeis University who has conducted research into polygraphs.

What the papers say – January 21

  What the papers say – January 21 Moves to deny terrorists early release from prison and EU trade talks are among the stories making today’s front pages.The Daily Telegraph and Metro report the UK’s most dangerous terrorists will be forced to serve their entire jail term without any prospect of early release as part of a crackdown.

I discuss my experience with Lie Detectors or Polygraphs - I also talk about Voice Stress Analysis and the first forms of Lie Detection by China using Rice

Lie detectors are also known as polygraph tests and use questioning techniques along with technology to record physiological functions to get the truthCredit: Alamy. How do lie detector tests work ? During a test a number of sensors are attached to the body in an attempt to determine whether

Saxe told Vox: “There’s no unique physiological sign of deception. And there’s no evidence whatsoever that the things the polygraph measures - heart rate, blood pressure, sweating, and breathing - are linked to whether you’re telling the truth or not.”

Research conducted by Saxe and other experts for a 1983 report for the US Congress resulted in a ban on “private employers giving polygraph tests to employees”. The veto was followed by a 1998 Supreme Court ban on the use of polygraph evidence in some federal courts, on the grounds that “there is simply no consensus that polygraph evidence is reliable”.

However, many scientists insist that lie detectors are still a useful tool.

Speaking to the BBC, Don Grubin, a Newcastle University professor of forensic psychiatry who has trained polygraph examiners in the UK, said: “If the examiner is well-trained, if the test is properly carried out, and if there’s proper quality controls, the accuracy is estimated between 80% to 90%.”

But Grubin admits that, with the right training, “there’s no question that you can beat a polygraph test”.

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