Can you beat a lie detector? UK police increasingly using polygraph tests – here’s how people try to cheat

Published

10 months ago

January 27, 2024

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I’m officially a bad liar.

With a blood pressure cuff pumped tight around my arm, straps around my chest monitoring my breathing, and sensors on my fingers to pick up any traces of sweat, veteran polygraph test examiner Don Cargill says he can easily spot the signs I’ve told him a fib.

I’ve denied writing the number three on the piece of paper placed underneath my chair, in a simple exercise designed to show how my body reacts to lying. Even with nothing to lose, it’s an uncomfortable experience.

But while commonly associated with daytime television programmes like The Jeremy Kyle Show, the use of lie detectors is expanding within the criminal justice system.

And the answers people give could help determine whether or not they can see their children – or even land them back in jail.

In an office above a branch of Carpetright in west London, Mr Cargill carries out private polygraph tests. His clients have included foreign politicians accused of bribery, bodybuilders who want to prove they haven’t taken performance-enhancing drugs, and people accused of stealing from their family or being unfaithful to a spouse.

More and more are trying to cheat the polygraph using instructions found online, he says. “There’s a lot of techniques they do but we spot 90% of them or more.”

I’m asked to jump up and down and open my mouth before my test. Some people have pressed drawing pins into the bottom of their shoes, or even superglued tacks in their mouths, to create a pain response in their brain to distort the chart, Mr Cargill says.

He asks for identification to make sure a stand-in hasn’t been sent and carries out other simple tests to spot signs of sleep deprivation or illegal drug use.

A camera is trained on the subject’s eyes to make sure they don’t cross them or “zone out”, while a seat pad is in place to catch out anyone clenching their bottom.

All of these methods have been used to try to cheat the test, Mr Cargill says.

Can lie detectors be cheated?

It is possible to beat the polygraph, says Newcastle University Emeritus Professor Don Grubin, but it takes a lot of practice with the equipment and examiners are trained to spot the signs of anyone trying to trick the test.

Double child killer Colin Pitchfork – who was jailed for life after raping and strangling 15-year-olds Lynda Mann and Dawn Ashworth in Leicestershire in 1983 and 1986 – was recalled to prison in 2021 partly due to concerns he was using breathing techniques in a bid to beat the lie detector.

The Home Office says the polygraph records physiological changes in a person, quoting research from the American Polygraph Association which found deception is accurately detected in 80 to 90% of cases.

Since 2014, probation services have carried out more than 8,800 polygraph tests, while police have conducted more than 4,600, says Prof Grubin, who explains around 60 to 70% result in disclosures – where someone reveals relevant information.

His company, Behavioural Measures UK, has trained and supervised dozens of police and parole polygraph test examiners over the past decade, and like other experts in the field, he doesn’t like the term lie detectors.

The technology detects the “cognitive process” (or the brain working harder) when someone tells a lie, he explains.

The “real skill lies in the experience of the examiner”, says Mr Cargill, the chief executive of VAST Screening Technologies Ltd and the chairman of the British and European Polygraph Association.

“Nervous reactions are completely different from people telling lies,” he says. “Your heart rate physically increases because you’re triggering the autonomic nervous system, which triggers a fight, flight or freeze response. You want to run away.”

But critics, including University of Northumbria researchers Dr Marion Oswald, a professor of law, and associate professor Dr Kyriakos Kotsoglou, say much of the research is carried out by the industry itself and the accuracy can’t be tested in a real-life situation – because it is impossible to verify if someone has told a lie.

They say it is an intrusive “interrogation” technique used to illicit confessions, arguing the polygraph device itself is unnecessary and could be swapped for putting someone’s hand on a photocopying machine – a method apparently used by Detroit police and immortalised in cult American crime drama The Wire.

“If you can convince the subject that she or he is being monitored for lies and they believe it, then she or he will disclose more information,” says Dr Kotsoglou.

How are lie detectors used?

The results can’t be used as evidence in criminal courts but mandatory lie detector tests have been used as a licence condition for sex offenders since 2014, then rolled out to convicted terrorists in 2021 in the wake of the Fishmongers’ Hall attack.

They are also used by police and the security services to monitor the small number of terror suspects made subject to Terrorism Prevention and Investigation Measures (Tpims).

There is currently a three-year trial for their use on domestic abuse offenders, while the new Criminal Justice Bill proposes to extend this to convicted murderers who pose a risk of committing a relevant sexual offence on release.

The tests provide “invaluable information we would otherwise not have had about offenders’ behaviour which helps us to better protect the public”, the Ministry of Justice says.

The Metropolitan Police is looking into using lie detection technology to vet new recruits or root out corrupt officers following a string of damaging scandals, including the cases of Sarah Everard’s murderer Wayne Couzens and serial rapist David Carrick.

But “this is still at an early research stage” and there are no imminent plans to use the technology in this way, the force says.

Others are turning to lie detectors to try to prove their innocence.

Kevin Duffy, 70, passed a polygraph test after he was convicted of sexually assaulting a child, but the results weren’t taken into account by the judge who jailed him for more than nine years.

His son Ryan Duffy, 44, says: “If there’s something that can be used when it’s one person’s word against another’s that can highlight some kind of evidence, why can’t it be used?

“If they are prepared to look at it after conviction for single case issues such as, ‘are you using public transport, hanging around schools’, and relying on data for probation services, then why can’t you use it beforehand?”

People can’t be sent back to prison for failing a test, but they can face further sanctions, such as stricter licence conditions, and they can be recalled for making disclosures that reveal they have breached licence conditions or indicate their risk has increased.

The information gathered can be shared with police to carry out further investigations, which could lead to charges, while those found trying to trick the polygraph can also be recalled to prison.

A government report last year revealed four convicted terrorists were sent back to jail as a result of lie detector tests – three were recalled after disclosing “risk-related information”, while the fourth didn’t comply with their polygraph licence condition.

An increasing number of police forces are using the polygraph, which is seen as a useful tool to monitor and assess the risk of people on the sex offenders’ register, allowing officers to concentrate stretched resources on those deemed the most dangerous.

At least 14 of the 43 territorial police forces in England and Wales are now using lie detectors, with 14 police officers and 11 staff qualified as polygraph examiners, according to figures obtained by Liberty Investigates.

The data shows 671 polygraph tests were carried out by the 13 forces who provided figures by calendar year, up from 458 in 2018, and a five-year high.

More forces are expected to start using the technology as the College of Policing makes available training through its “polygraph school”.

Suspects facing lie detector tests

Testing is “only mandatory by way of conditional caution or a positive obligation of a Sexual Harm Prevention Order or Sexual Risk Order” imposed by the courts, says the National Police Chiefs’ Council, and “any police use of polygraph will form part of a wider and detailed risk management plan tailored to the individual concerned”.

But the University of Northumbria researchers say a non-statutory regime of testing is being carried out by some forces, including on suspects during criminal investigation.

People arrested on suspicion of committing online child sex offences, for example, could be asked to take a test as part of a risk assessment to determine whether they can have contact with children, including their own.

Figures obtained by Prof Oswald and Dr Kotsoglou, using freedom of information requests, show that at least 228 such polygraph interviews were carried out over six years.

Other responses indicated use in “voluntary” risk assessments of convicted sex offenders, including those who apply for removal from the sex offenders’ register, and ambitions to use polygraph testing for more general offences such as violence.

History of the lie detector

The polygraph machine was invented in 1921 by police officer John Larson in Berkley, California, and has been used by US law enforcement agencies ever since and spread across the world.

His work was picked up by Leonard Keeler, who is widely credited as the inventor of the modern lie detector.

In the 1990s, the polygraph entered the computer age as statisticians at Johns Hopkins University developed an algorithm to analyse the data collected.

Jack Ruby, who shot dead Lee Harvey Oswald two days after he assassinated John F Kennedy requested and was granted a polygraph test to try to prove he was not involved in a conspiracy with Oswald – but then FBI-director J Edgar Hoover said the technique was not “sufficiently precise” to judge truth or deception “without qualification”.

Notable failures include CIA agent Aldrich Ames, who passed two polygraph tests while spying for the Soviet Union.

Prof Oswald says: “I think our concern is that should we really in this country be basing really serious criminal justice decisions in a legal system on a scientific technique that is highly contested, to put it mildly, and hasn’t, especially in the policing circumstance, been discussed by parliament?”

The College of Policing says: “The College is working closely with the NPCC to establish a Polygraph School so that policing in England and Wales has access to standardised learning and development in the use of the tool that is tailored to their operating environment.

“The College will develop operational advice so that forces using the tool have a consistent basis on which to do so whilst recognising the relevant legal provisions.”

What is the future for lie detectors?

The technology has existed in some form for around a century and now Mr Cargill has invented what he calls a “completely revolutionary” Validated Automated Screening Technology (VAST) system – or “polygraph in a box”.

Programmed to find out anything from whether someone has massaged the qualifications on their CV to if they’re a member of an international terrorist organisation, he says the device is as accurate as any polygraph examiner and is already being used by police in the UK.

But the testing time is reduced to around 20 minutes from three hours and can be used with just 15 minutes training.

After filling out a questionnaire, the subject – attached to the device, wearing headphones and sensors on their fingers and palm – is instructed to silently answer “no” to the questions by a person in a recorded video on the screen. A human then grills them about any responses that indicate deception.

“I call it a truth verifier rather than a lie detector because what it’s doing is testing integrity,” explains Mr Cargill.

The technology, he says, would be ideal for use in police vetting and he wants to see it rolled out to areas such as Border Force, where officers could verify someone’s age or country of origin.

UK

Five people guilty in case of mistaken-identity double murder of teenage boys

Published

10 hours ago

November 15, 2024

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Five people guilty in case of mistaken-identity double murder of teenage boys

Four teenagers and a 45-year-old man have been found guilty of murdering two boys, aged 15 and 16, who were attacked with machetes in a case of mistaken identity.

The convictions follow a five-week trial at Bristol Crown Court.

The jury heard how Max Dixon and Mason Rist were killed in a case of mistaken identity on 27 January, after being wrongly identified as being responsible for a house attack in the Hartcliffe area of the city earlier that evening.

Antony Snook, 45, Riley Tolliver, 18, and three boys aged 15, 16 and 17 were all on trial each charged with two counts of murder.

As the jury foreman returned the guilty verdicts, none of the defendants showed any reaction from the dock, as they sat impassively and stared straight ahead.

The fatal stabbings in Knowle West lasted just 33 seconds – with both boys suffering what the court heard were “unsurvivable” injuries and “instant severe blood loss”.

Both died in hospital in the early hours of 28 January.

Detective Superintendent Gary Haskins, the case’s senior investigating officer from Avon and Somerset Police, told Sky News that Max and Mason had nothing to do with the house attack.

“Those boys were not known to their attackers, they were best friends, two beautiful children just going about their lives and attacked for no reason whatsoever,” he said.

Much of the prosecution’s case was based on CCTV and doorbell videos, including a camera on Mason’s own house which captured footage of the knife attack against him.

The pair were seen leaving Mason’s home at around 11.15pm and were going for a pizza.

Prosecutor Ray Tully KC told the jury that the boys were set upon by the group who had been travelling in Snook’s Audi Q2.

He said the group were “out for revenge”, “acting as a pack” to hunt down those responsible and “tooled up” with fearsome weapons.

After the attackers fled, Max and Mason were left bleeding in the street.

The investigation involved more than 230 police officers and staff – with thousands of pieces of evidence analysed.

Hundreds mourned victims at school

The teenage victims were in year 11 together at the Oasis Academy John Williams secondary school and were preparing to sit their GCSEs this summer.

The school’s headteacher Victoria Boomer-Clark told Sky News that everyone rallied to support fellow pupils and staff.

She said: “After the boys were tragically murdered, for us first and foremost we were thinking about the families and how they were coping with the absolute tragedy and shock of that.

“I can remember trying to prepare for that Monday morning and my memories now are how exceptionally strong our young people are and how we have a real sense of community.

“Unbeknownst to us the young people had arranged to hold a vigil on the playground during breaktime on that first Monday. We had hundreds of young people and staff coming together in silence.”

Ms Boomer-Clark said the boys would have attended school prom this summer.

“We had a wall that was lit up in red for Mason and Liverpool football club and a wall in blue for Park Knowle Football Club,” she said. “The year group came together and supported each other through it.”

Detective had never seen ‘horrific’ weapons before

The murders came before a new law was introduced banning ownership of zombie-style knives and machetes.

Detective Superintendent Gary Haskins said: “The weapons used in the attack on Mason and Max were simply horrific.

“I’ve been a detective for many, many years and I’ve had the misfortune of investigating some serious offences.

“In all my service I’ve not seen a weapon like the one we saw used on those two boys.

“There is no place for a weapon of that type in society for any reason whatsoever.”

The detective praised the boy’s families, who attended court throughout the trial.

He added: “I’m humbled by the families involved in this investigation. They’ve been at court every day, they’ve seen things at court that no parent should ever be exposed to. They saw the attacks on their children, but they maintain their dignity, their courage and their love for their family.

“How can you replace what they’ve lost? They’ve lost two beautiful sons, and I can only hope that the verdicts will bring some form of closure. It will never close completely.”

Snook will be sentenced on 19 November at Bristol Crown Court.

The other four defendants will be sentenced on 16 December following the preparation of pre-sentence reports.

Police are continuing to investigate the Hartcliffe house attack and search for those responsible.

UK

UK economy grows by 0.1% between July and September – slower than expected

Published

13 hours ago

November 15, 2024

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UK economy grows by 0.1% between July and September - slower than expected

The UK economy grew by 0.1% between July and September, according to the Office for National Statistics (ONS).

However, despite the small positive GDP growth recorded in the third quarter, the economy shrank by 0.1% in September, dragging down overall growth for the quarter.

The growth was also slower than what had been expected by experts and a drop from the 0.5% growth between April and June, the ONS said.

Economists polled by Reuters and the Bank of England had forecast an expansion of 0.2%, slowing from the rapid growth seen over the first half of 2024 when the economy was rebounding from last year’s shallow recession.

And the metric that Labour has said it is most focused on – the GDP per capita, or the economic output divided by the number of people in the country – also fell by 0.1%.

Reacting to the figures, Chancellor of the Exchequer Rachel Reeves said: “Improving economic growth is at the heart of everything I am seeking to achieve, which is why I am not satisfied with these numbers.

“At my budget, I took the difficult choices to fix the foundations and stabilise our public finances.

“Now we are going to deliver growth through investment and reform to create more jobs and more money in people’s pockets, get the NHS back on its feet, rebuild Britain and secure our borders in a decade of national renewal,” Ms Reeves added.

The sluggish services sector – which makes up the bulk of the British economy – was a particular drag on growth over the past three months. It expanded by 0.1%, cancelling out the 0.8% growth in the construction sector.

The UK’s GDP for the most recent quarter is lower than the 0.7% growth in the US and 0.4% in the Eurozone.

The figures have pushed the UK towards the bottom of the G7 growth table for the third quarter of the year.

It was expected to meet the same 0.2% growth figures reported in Germany and Japan – but fell below that after a slow September.

The pound remained stable following the news, hovering around $1.267. The FTSE 100, meanwhile, opened the day down by 0.4%.

The Bank of England last week predicted that Ms Reeves’s first budget as chancellor will increase inflation by up to half a percentage point over the next two years, contributing to a slower decline in interest rates than previously thought.

Announcing a widely anticipated 0.25 percentage point cut in the base rate to 4.75%, the Bank’s Monetary Policy Committee (MPC) forecast that inflation will return “sustainably” to its target of 2% in the first half of 2027, a year later than at its last meeting.

The Bank’s quarterly report found Ms Reeves’s £70bn package of tax and borrowing measures will place upward pressure on prices, as well as delivering a three-quarter point increase to GDP next year.

UK

Meeting the deeply radical anti-tax group that is ‘growing in popularity’

Published

13 hours ago

November 15, 2024

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Meeting the deeply radical anti-tax group that is 'growing in popularity'

“If you are a member of something, it means you’ve accepted membership. Anything with ‘ship’ on the end, it’s giving you a clue: it’s telling you that’s maritime law. That means you’ve entered into a contract.”

This isn’t your standard legal argument and it is becoming clear that I am dealing with an unusual way of looking at the world.

I’m in the library of a hotel in Leicestershire, a wood-panelled room with warm lighting, and Pete Stone, better known as Sovereign Pete, is explaining how “the system” works. Mr Stone is in his mid-50, bald with a goatee beard and wearing, as he always does for public appearances, a black T-shirt and black jeans.

With us are six other people, mainly dressed in neat jumpers. They’re members of the Sovereign Project (SP), an organisation Mr Stone founded in 2020, which, he says, now has more than 20,000 paying members.

As arcane as this may sound, it represents a worldview that is becoming more influential – and causing problems for authorities. Loosely, they’re defined as “sovereign citizens” or “freemen on the land”.

Their fundamental point is that nobody is required to obey laws they have not specifically consented to – especially when it comes to tax. They have hundreds of thousands of followers in the UK across platforms including YouTube, Facebook and Telegram.

Increasingly, they are coming into conflict with governments and the law. Sovereign citizens have ended up in the High Court in recent months, challenging the legalities of tax bills and losing on both occasions.

In October, four people were sentenced to prison for the attempted kidnapping of an Essex coroner, who they saw as acting unlawfully. The self-appointed “sheriffs” attempted to force entry to the court, one of them demanding: “You guys have been practising fraud!”

The Sovereign Project is not connected to any of those cases, nor does it promote any sort of political action, let alone violence.

Instead, they are focused on issues like questioning the obligation to pay taxes, as Mr Stone explains, referencing the feudal system that operated in the Middle Ages.

“Do you know about the feudal system when people were slaves and were forced to pay tax?” he asks.

“Now, unless the feudal system still operates today, and we still have serfs and slaves, then the only way that you can pay taxes is to have a contract, you have to agree to it and consent to it.”

Another member, Karl Deans, a 43-year-old property developer who runs the SP’s social media, says: “We’re not here to dodge tax.”

Local government tends to be a target beyond just demands for tax. Mr Stone speaks of “council employee crimes”.

I ask whether, considering the attempted kidnapping in Essex, there is a danger that people will listen to these accusations of crimes by councils and act on them.

“Well that’s proved,” Mr Stone says. “We only deal with facts.”

Evidence suggests this approach is becoming an issue for councils across the UK, as people search online for ways to avoid paying tax.

Sky News analysis shows that out of 374 council websites covering Great Britain, at least 172 (46%) have pages responding to sovereign citizen arguments around avoiding paying council tax. They point out that liability for council tax is not dependent on consent, or a contract, and instead relies on the Local Government Finance Act 1992, voted on by Parliament.

But the Sovereign Project’s worldview extends beyond council tax. It is deeply anti-establishment, at times conspiratorial. Stone suggests the summer riots may have been organised by the government.

“The sovereign fraternity operates above all of this,” he says. “We look down at the world like a chessboard. We see what’s going on.”

He explains that, really, the UK government isn’t actually in control: there is a shadow government above them.

“These are the people who control government,” he explains.

“A lot of people say this could be the crown council of 13, this could be a series of Italian families.”

Professor Christine Sarteschi, an expert in sovereign citizens at Chatham University, Pittsburgh, says she’s worried about the threat sovereign citizens may pose to the rule of law, especially in the US where guns are readily available.

“The movement is growing and that’s evidenced by seeing it in different countries and hearing about different cases. The concern is that they will become emboldened and commit acts of violence,” she says.

“Because sovereigns truly believe in their ideas and if they feel very aggrieved by, you know, the government or whomever they think is oppressing them or controlling them… they can become emotionally involved.

“That emotional involvement sometimes leads to violence in some cases, or the belief that they have the power to attempt to overthrow a government in some capacity.”

Much of this seems to be based on an underlying and familiar frustration at the state of this country and of the world.

Mr Stone echoes some of the characteristic arguments also made by the right, that there is “two-tier policing”, that refugees arriving in the UK are “young men of fighting age”, that the government is using “forced immigration to destroy the country”.

Another SP member, retired investment banker David Hopgood, 61, says: “I firmly believe it is the true Englishman – and woman – of this country – that has the power to unlock this madness that’s happening in the West.

“We’ve got the Magna Carta – all these checks and balances. We just need to pack up, go down to Parliament and say: It’s time to dismiss you. You’re not fit for purpose.”

The members of the Sovereign Project are unfailingly patient and polite in explaining their understanding of the world.

But there is no doubt they hold a deeply radical view, one that is apparently growing in popularity.