The mother of a 10-year-old girl who has gone missing in Iowa in the US has taken lie detector tests in an attempt to be ruled out of the police investigation.
Misty Cook-Morrissey has undergone two polygraph tests as part of the inquiry into the disappearance of her daughter Lyric and her eight year-old cousin Elizabeth Collins eleven days ago, according to US media reports.
The girls were last seen riding bikes in the Meyers Lake area of Ivansdale, Iowa, on Friday July 13.
The possibility that the cousins had fallen into the lake was ruled out after the water was drudged and searched by the FBI using sonar equipment.
A search operation involving hundreds of local people immediately after the girls went missing also failed to throw up any clues.
Investigators now believe the girls are still alive and could have been abducted.
As part of their inquiries they are scrutinising Mrs Cook-Morrissey and her estranged husband Dan Morrissey who have both served time in jail for drugs offences.
Last week it was reported that the couple had been advised by their lawyer not to co-operate with investigators but the 34-year-old mother has now undergone two lie detector tests.
After the first one proved inconclusive Mrs Cook-Morrissey has told local media that results of the second test show she had nothing to do with the girls’ disappearance.
She said she was asked directly during the test if she had anything to do with her daughter’s abduction, answering no.
Afterwards, she told the Associated Press: "It went well. They can rule me out of their book and move on to something else."
The FBI has declined to comment on the results of the lie detector tests.
Meanwhile, a spokesman for the parents of Elizabeth, Heather and Drew Collins, said they had been “co-operating 300%” with police since ever since the girls disappeared.
US authorities are also appealing for information from a person seen on a paddleboat on the lake at about the same time the girls went missing.
A Facebook group has been set up to raise awareness about the search for the young cousins.