Madeleine McCann suspect challenged to take lie detector test to prove he's innocent by top polygraph expert

A CHILD killer identified as a suspect in Madeleine McCann's disappearance has been challenged to take a lie detector test to prove his innocence by a polygraph expert.

Martin Ney, whose name was given to Scotland Yard as a possible suspect, is serving a life sentence for strangling three boys.

The German is said to resemble the photofit of a man seen carrying a child from the Portuguese holiday complex where the youngster vanished.

Don Cargill, president of the European and British Polygraph Association, has told Ney to prove his claim of not being involved in Maddie’s disappearance.

She vanished 12 years ago on May 3, 2007, when her family, from Leicestershire, were holidaying in Praia da Luz, in the Algarve, Portugal.

Parents Gerry and Kate left their three children – including toddler twins Sean and Amelie – sleeping in their apartment while they dined at a tapas bar – 120 metres away.

When Kate returned to check on the kids at around 10pm that evening, she discovered that Maddie was not in her bed and was missing.

Ney, 48, emerged as a key suspect in May 2019 – and it is believed he was in Portugal when Maddie went missing.

He was working for an evangelical church on a project for the homeless, it's claimed.

Mr Cargill insists lie detector tests are 90-95 per cent accurate and would conclusively prove if Ney was telling the truth about not being involved.


The polygraph expert has been involved in two major successes involving lie detectors.

He got farmer Adrian Prout to admit in jail he murdered his missing wife, and proved Liverpool FC fan Michael Shields was innocent of attacking a waiter in Bulgaria.

Mr Cargill, 67, has invited Met Police detectives to contact him to establish if Ney is willing to undergo the 90 minute test, which monitors a patient’s blood pressure, heart and sweat rates, while they answer questions.

He said: “If Ney’s telling the truth, he’s got nothing to hide or fear from me. I think he’d welcome the chance of clearing his name.”

Scotland Yard and Portugal’s Polícia Judiciária have kept the new suspect’s name secret, but former Portuguese cop Gonçalo Amaral claimed he has knowledge of a German being investigated.

He refused to identify Ney by name but says a German suspect was quizzed by PJ detectives as part of their 2008 probe.

Mr Amaral said he was ruled out of the investigation but jailed in Germany for "offences unconnected to the Maddie case".

Mr Cargill said: "Perhaps he was only interested in boys, in which case he should undergo the test to prove he isn’t interested in girls, and didn’t abduct Maddie.”

Paedophiles in British jails take regular lie detector tests when seeking parole, under a new Home Office initiative.

Lie tests are commonly used as evidence in US courts where officials also claim it is 90-95 per cent accurate.

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