More than 100 days after Nancy Guthrie disappeared from her Tucson-area home, investigators say the DNA evidence in the case was first sent to a private laboratory in Florida before being transferred to the FBI's lab in Quantico, a move that has intensified scrutiny of how the inquiry is being handled.
Sheriff Chris Nanos has insisted key details are being withheld to protect the case, even as critics, including Khloé Kardashian, question why so little has been made public.
