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.
Image: Lie detector tests featured regularly on The Jeremy Kyle Show. Pic: ITV
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.
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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.
Image: Sky’s Henry Vaughan takes a lie detector test
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.
Image: The results of a polygraph test
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.
Image: David Carrick and Wayne Couzens
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?”
Image: Kevin Duffy took a polygraph test to try to prove his innocence. Pic: Ryan Duffy
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.
Image: Sensors pick up any traces of sweat during the polygraph test
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”.
Image: Polygraph tester Don Cargill reviews Henry’s results
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.”
Image: A new test known as ‘polygraph in a box’ has been developed
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.
The last blast furnaces left operating in Britain could see their fate sealed within days, after their Chinese owners took the decision to cut off the crucial supply of ingredients keeping them running.
Jingye, the owner of British Steel in Scunthorpe, has, according to union representatives, cancelled future orders for the iron ore, coal and other raw materials needed to keep the furnaces running.
The upshot is that they may have to close next month – even sooner than the earliest date suggested for its closure.
The fate of the blast furnaces – the last two domestic sources of virgin steel, made from iron ore rather than recycled – is likely to be determined in a matter of days, with the Department for Business and Trade now actively pondering nationalisation.
The upshot is that even as Britain contends with a trade war across the Atlantic, it is now working against the clock to secure the future of steelmaking at Scunthorpe.
The talks between the government and Jingye broke down last week after the Chinese company, which bought British Steel out of receivership in 2020, rejected a £500m offer of public money to replace the existing furnaces with electric arc furnaces.
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The sum is the same one it offered to Tata Steel, which has shut down the other remaining UK blast furnaces in Port Talbot and is planning to build electric furnaces – which have far lower carbon emissions.
Image: These steel workers could soon be out of work
However, the owners argue that the amount is too little to justify extra investment at Scunthorpe, and said last week they were now consulting on the date of shutting both the blast furnaces and the attached steelworks.
Since British Steel is the main provider of steel rails to Network Rail – as well as other construction steels available from only a few sites in the world – the closure would leave the UK more reliant on imports for critical infrastructure sites.
However, since the site belongs to its Chinese owners, a decision to nationalise the site would involve radical steps government officials are wary of taking.
They also fear leaving taxpayers exposed to a potentially loss-making business for the long run.
The dilemma has been heightened by the sharp turn in geopolitical sentiment following Donald Trump’s return to the White House.
The incipient trade war and threatened cut in American support to Europe have sparked fresh calls for countries to act urgently to secure their own supplies of critical materials, especially those used for defence and infrastructure.
Gareth Stace, head of UK Steel, the industry lobby group, said: “Talks seem to have broken down between government and British Steel.
“My advice to government is: please, Jonathan Reynolds, Business Secretary, get back round that negotiating table, thrash out a deal, and if a deal can’t be found in the next few days, then I fear for the very future of the sector, but also here for Scunthorpe steelworks.”
Prince Andrew’s efforts to make money from his Pitch@Palace project have been branded as a “crude attempt to enrich himself” at the expense of “unsuspecting tech founders”, as new documents may shed more light on what he and his team have been attempting to sell.
Today is the deadline for documents to be released relating to Prince Andrew‘s former senior adviser Dominic Hampshire and his interactions with the alleged Chinese spy Yang Tengbo.
In February, an immigration tribunal heard how the intelligence services had contacted Mr Hampshire about Mr Yang back in 2022. Mr Yang helped set up Pitch@Palace China, a branch of the duke’s scheme to help young entrepreneurs.
Image: The alleged Chinese spy, Yang Tengbo, has links with Prince Andrew
Image: Yang Tengbo. Pic: Pitch@Palace
Judges banned Mr Yang from the UK, saying his association with a senior royal had made Prince Andrew “vulnerable” and posed a threat to national security. Mr Yang challenged that decision at the Special Immigration Appeals Commission (SIAC).
Since that hearing, media organisations have applied for certain documents relating to the case and Mr Hampshire’s support for Mr Yang to be made public. SIAC agreed to release some information of public interest. It is hoped they may include more details on deals that he was trying to do on behalf of Prince Andrew.
So what do we know about potential deals for Pitch@Palace so far?
In February, Sky News confirmed that palace officials had a meeting last summer with tech funding company StartupBootcamp to discuss a potential tie-up between them and Prince Andrew relating to his Pitch@Palace project.
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The palace wasn’t involved in the fine details of a deal but wanted guarantees to make sure it wouldn’t impact the Royal Family in the future. Sky News understands from one source that the price being discussed for Pitch was around £750,000 – there are, however, reports that a deal may have stalled.
Photos we found on the Chinese Chamber of Commerce website show an event held in Asia between StartupBootcamp and Innovate Global, believed to be an offshoot of Pitch.
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Who is alleged Chinese spy, Yang Tengbo?
Documents, released in relation to the investigations into Mr Tengbo, have also shown how much the duke has always seen Pitch as a way of potentially making money. One document from 21 August 2021 clearly states “the duke needed money at the time, and saw the relationships with China through Pitch as one possible source of funding”.
But Prince Andrew’s apparent intention to use Pitch to make money has led to concerns about whether he is unfairly using the contacts and information he gained when he was a working royal.
Norman Baker, former MP and author of books on royal finances, believes it is “a crude attempt to enrich himself” and goes against what the tech entrepreneurs thought they were signing up for.
He told Sky News: “The data given by these business people was given on the basis it was an official operation and not something for Prince Andrew, and so in my view, Prince Andrew had no right legally or morally to take the data which has been collected, a huge amount of data, and sell it…
“And quite clearly if you’re going to sell it off to StartupBootcamp, that is not what people had in mind. The entrepreneurs who joined Pitch@Palace did not do so to enrich Prince Andrew,” he said.
Rich Wilson was one tech entrepreneur who was approached at the start of Pitch@Palace to sign up, but he stepped away when he spotted a clause in the contract saying they’d be entitled to 2% equity in any funding he secured.
He feels Prince Andrew is continuing to use those he made a show of supporting.
He said: “It makes me feel sick. I think it’s terrible – that he is continuing to exploit unsuspecting tech founders in this way. A lot of them, I’m quite grey and old in the tooth now, I saw it coming, but clearly most didn’t. And a lot of them were quite young.
“It’ll be their first venture and you’re learning on the trot, so to speak. So to take advantage of people in such a major way – that’s an awful, sickening thing to do.”
We approached StartupBootcamp who said they had no comment to make, and the Duke of York’s office did not respond.
With reports that a deal may have stalled, it could be a big setback for the duke – especially with questions still about how he’ll continue to pay for his home on the Windsor estate now that the King no longer gives him financial support.
The UK is in talks with Brazil over the “potential sale” of the Royal Navy’s two amphibious assault ships that are being ditched to cut costs, the Ministry of Defence has confirmed.
Defence experts said the fact HMS Bulwark – which has only just received an expensive refit – and HMS Albion are being flogged off underlines the pressure on the defence budget even though Sir Keir Starmer keeps talking up his promises to boost expenditure.
The two warships can be used to deploy Royal Marines to shore – a vital capability at a time of growing global threats.
News of the possible sale was first revealed in Latin American media.
One report said the Royal Navy and Brazilian Navy had signed an agreement that would see the UK giving information to the Brazilians on the state of the two ships prior to any purchase.
Asked about the claim that the UK would sell the assault ships to Brazil, a Ministry of Defence spokesperson said: “We can confirm we have entered discussions with the Brazilian Navy over the potential sale of HMS Bulwark and HMS Albion.
“As announced in November, both ships are being decommissioned from the Royal Navy. Neither were planned to go back to sea before their out of service dates in the 2030s.”
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James Cartlidge, the shadow defence secretary, appeared to question the wisdom of the move.
“At Defence orals [House of Commons questions] on January 6th Defence Secretary John Healey said: ‘HMS Bulwark and HMS Albion were not genuine capabilities’,” Mr Cartlidge wrote in a post on social media.
“They’ve just been sold to Brazil.”
Matthew Savill, the director of military science at the Royal United Services Institute, said the plan to sell the vessels demonstrates there “is still life in both these ships”.
He said: “The fact that the UK is prepared to sell off useful amphibious capability – which could be used in evacuation operations or other cases where air transport is difficult – shows just how tight finances are even with the promised budget increase.
“The replacements for these ships are still several years away and won’t be available until the 2030s.”
Mr Savill added: “As an aside, Brazil will probably have greater amphibious capacity than the UK, having previously bought HMS Ocean, the UK’s helicopter assault ship.”
HMS Albion and HMS Bulwark entered service two decades ago.
Both are currently held at lower readiness having not been to sea since 2023 and 2017 respectively.
HMS Ocean, a helicopter-landing vessel and once the largest warship in the Royal Navy, was sold to the Brazilian Navy in 2018 after 20 years in service.