The FBI are to give a daughter a lie-detector test after she claimed her dad was a serial killer who butchered 70 women.
Lucy Studey, 53, has spoken out against her late father, Donald Dean Studey, after claiming she and her siblings were forced to move human remains of women and sex workers across farmland to their house in Iowa.
The daughter is now to undergo a lie-detector test before investigators tear up the 425-plus acres of land after insisting bodies were also dumped down a 90ft well.
She admitted her siblings used a wheelbarrow and a toboggan to deposit of the women all-year round.
The daughter revealed how she offered to undergo a lie-detector test in 1998 but it was rejected.
She now believes the request is to try and discredit her before they start the dig.
Lucy told Newsweek : "They'll finally believe me. I'm not worried at all (about the test)... I figured before they spent any money to excavate, that they would try to discredit me."
The FBI Omaha office have not commented on the claims but, according to a source close to the investigation, "it's just an exhaustive means...just another avenue."
Meanwhile, the accuracy of the polygraphs can vary as the American Polygraph Association estimates the test can be around 87 percent accurate.
Whilst there have been further studies which estimate it to be closer to 75 percent and due to their varying levels of accuracy they are rarely used in criminal trials.
However, Lucy, who has been making the claims against her father for over 45 years, claimed it was thanks to a sheriff's deputy in Fremont Count who started to believe her.
A German shepherd was recently used by investigators to scout the location in Thurman, Iowa, US, when the dog started to smell human remains near a mushroom trail.
According to investigators, the dog started to smell the human scent and alerted their handlers.
Lucy told Newsweek : "I'm not surprised they hit there because my dad said the bodies were the reason the mushrooms grow so big. We put lye on spots on the mushroom trail."
It is the third dog which has smelt human remains after two dogs, both separately, on October 20 alerted their handlers near a well.
Fremont County Sheriff's investigators are working with state and federal authorities to investigate if bodies could be scattered across the huge farmland.
Donald, who died in 2013 aged 75, had four children Linda, Gary, Susan and Lucy who is the only sibling that has come forward with the claims.
However, Susan publicly denied the accusations and hit back at her sister in October: "I am two years older, I think I would have known if my dad was a serial killer."
