Hair sample inconclusive in search for missing mother Nancy Guthrie

The search for missing mother Nancy Guthrie has hit the six-month mark with no definitive leads. A hair sample discovered at her Tucson, Arizona, home has come back inconclusive after forensic testing, the Pima County Sheriff told CBS News. Sheriff Chris Nanos stated the results yielded "no results" and were verified in early June, but the information was only made public on Thursday. "It came back with no results," Nanos said. "I know that there was blood at the scene and so that was also part of the processing of the scene." Blood and other DNA evidence found at the residence are still undergoing analysis, but have so far also produced no results. Officials have not confirmed if the hair sample was the same DNA sample sent to a private lab in Florida and then to the FBI's crime lab. "We have a lot of DNA that is being looked at by credible scientists around the country who know and understand what they have in front of them and they understand the rules that they have to play by," Nanos said. Nancy Guthrie, 84, was last seen on January 31. Security footage from her home showed an unidentified suspect at her front door on February 1. Investigators believe she was abducted, and at least two ransom notes were sent. "Even when a case goes cold, we don't give up on it," Nanos said. "We continue to work it. This one's far from being cold. God forbid this ever takes 50 years, but it could." No new video has been recovered, and the suspect or suspects appear to have avoided traffic cameras. Nanos believes the perpetrators are likely local to the Tucson area, though he lacks concrete evidence. "Do I have evidence of it? No," Nanos said. "But let's look at crime across the country, around the world, who by far, 90%, 95% of your criminals are where? Right here locally."

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It came back with no results.