EVIL Wayne Couzens exposed his guilt at killing Sarah Everard three times in a chilling police interview as he spun a grisly web of lies.
The killer cop carried out a fake arrest to kidnap Sarah, 33, as she walked home from a friend's home in Clapham, South West London.
Couzens then raped and murdered the marketing executive, whose burnt body was found a week later more than 50 miles away in Kent.
Police arrested the monster at his family home where he spun a twisted web of lies.
Experts have now explored the footage of that interview for documentary The Murder of Sarah Everard: A Faking It Special
on discovery+.
Body language expert Dr Cliff Lansley has revealed the three tell-tale signs that gave away Couzens' guilt as he repeatedly lied to cops.
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Officers can be seen showing the killer a picture of Sarah as they try to get the killer to admit he has seen her before.
Dr Lansley says Couzensbegins revealing "tells" right from the start that suggest he is already lying.
He adds: “Immediately we’ve got indicators that there's a lot of anxiety going on here with with Couzens. First of all we see a deep swallow.
"What does a swallow mean? When we're anxious, when we’re fearful of being caught in a lie, the digestion system closes down, drying up the mouth. This can trigger swallowing or licking of the lips to try and compensate for the effect of what's happening with the autonomic nervous system."
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Couzens also gives a "prolonged head shake" when he answers no to the police questions, which the expert explains is a "convince tactic".
As the interview continues, the cop begins stumbling over his answers as he slowly realises his colleagues have a potential smoking gun linking him to the gruesome crime.
As he continues to falter over his denials of ever meeting Sarah, Couzens exposes his guilt further.
Dr Lansley says: "If we could put a heart monitor on him right now, his heartbeat is probably running about 120bpm.
"If you notice the top half of his t-shirt, you will see that little rise and fall every second. It's a fast, rapid, upper chest breath rate. He’s really now in a panic state at this point.
"The police seem to have some connection between him and Sarah. He’s in trouble now and he knows it.”
Realising his number might be up, Couzens then dramatically changes his story to spin a twisted web of lies involving a gang from the "Bulgaria, Romania Albania” region.
The ludicrous tale centres on his insistence he had "no choice" but to kidnap Sarah, who was a stranger to him, for the human trafficking gang.
He claimed he was in "financial s**t" and was unable to pay for a prostitute he met in a Holiday Inn in Folkestone so was ordered to find "another girl" otherwise his family would be harmed.
Dr Lansley says “Couzens is launching himself into a story now and it’s populated with filled pauses and disfluencies, which tells us this isn't a relaxed story, he’s still tense.
"In addition, we get what seems to be a major ‘tell’ for Wayne Couzens – a double-sided shoulder shrug.
"In that little fairy tale, we've got eight double-sided shoulder shrugs, amplified with the elbows. And then we get a great big swallow at the end when he finishes his story, which tells us how stressful
this fabrication has been for him. This is a lie.”
In reality, Couzens had hatched a ghastly plot to travel to London and abduct a woman.
On February 28, 2021, he rented the car used to snatch Sarah using his name, address and two different mobile phones.
The killer then prowled the dark streets looking for prey when he spotted Sarah walking home on March 3.
The Met Police officer, who was wearing a police belt later used to strangle Sarah, then produced his warrant card as he tricked her into a fake arrest.
The final time Sarah was seen alive was in the back of Couzen's rental car as she was driven to her death just five minutes after the predator pounced.
What followed was a terrifying 50-mile journey from London to Dover where Sarah – trapped by handcuffs and her seatbelt – was unable to escape.
After strangling defenceless Sarah, Couzens treated himself to a hot chocolate with coconut milk and bakewell tart from Costa.
He then chucked her phone in a river and was spotted on CCTV filling up a jerry can with petrol.
The monster used the fuel to burn Sarah's body in a discarded fridge on a plot of land he owned and had once described as "perfect for a day out".
Couzens put her charred remains in green rubble bags and dumped them in a pond in woodland.
He then calmly called his vet to make an appointment for the family dog about "possible medication for separation anxiety".
This phonecall is also explored in the documentary as Couzens continues with his life as though nothing has happened.
Forensic psychologist Kerry Daynes says: "It seems incongruous doesn't it, that he is concerned that his pooch has got separation
anxiety, when he has just taken a woman's life.
"Her family, her friends, her boyfriend are never going to see her again…. but that's how egocentric killers are and that's how able they are to compartmentalise different aspects of their lives and different aspects of their behaviour."
Meanwhile in London, a huge search was launched for Sarah, whose death became synonymous with the hashtag: "She was only walking home".
Couzens, who joined the Met Police in 2018, was charged with kidnap and murder more than a week after Sarah first vanished.
The cop, who worked on the Parliamentary and Diplomatic Protection Command unit, had finished a shift earlier on the morning of March 3 and was not on duty at the time of Sarah's disappearance.
Despite wiping his phone, data on the device linked Couzens to the abduction and eventually the area where Sarah was found.
After his arrest, the dedicated family man persona the monster tried creating began to crumble.
The married dad-of-two was revealed as a sex pest who contacted escorts and used a Match.com dating profile.
But even more sinister, it emerged Couzens had slipped through the net despite indulging in dark fantasies.
His creeped-out colleagues branded him "The Rapist" and knew he had a sadistic interest in violent porn.
Couzens has since admitted indecent exposure, including one incident at a McDonald's just days before Sarah's murder.
Branding the killer a "ticking time bomb", Kerry says: "This is something that has been percolating in Couzens’ mind for, I
would say, probably years and years."
In September 2021, Couzens joined the grim ranks of criminals in the UK who will die behind bars after receiving a whole life tariff.
He was handed a further 19 months in March this year after pleading guilty to three counts of indecent exposure.
- ‘The Murder of Sarah Everard: A Faking It Special’ available to stream from Monday 14th August on discovery+
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