The sheriff leading the investigation into Nancy Guthrie's kidnapping said he is optimistic about the case based on all the evidence, even after DNA testing on a hair sample found in her home returned no profile.
Guthrie was kidnapped from her home in Tucson, Arizona, nearly six months ago. The sheriff, who is at the forefront of the investigation, made the comments in a recent interview.
Investigators say the hair sample may still prove valuable as the case continues, even though it could not be profiled. The development is the latest detail to emerge in the ongoing search for Guthrie.
The sheriff did not elaborate on what evidence gives him confidence, but he pointed to the overall body of evidence in the case. Authorities have not released further information about possible suspects or a motive.
The case has drawn attention since Guthrie's disappearance, and investigators continue to ask the public for help. Anyone with information is urged to contact the Pima County Sheriff's Office.
Guthrie's family has pleaded for her safe return, and the community has held vigils. The investigation remains active, with authorities pursuing multiple leads.
The sheriff's upbeat assessment stands in contrast to the forensic setback, but he stressed that the absence of a DNA profile does not mean the sample is useless. Investigators are exploring other ways to use it.