Pima County Sheriff Chris Nanos tells CBS News' Jon Vigliotti the testing on the hair ... - Facebook
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Hair recovered from Nancy Guthrie's home has been tested — and what forensic science can and can't prove from a single strand is now the question.
Forensic Evidence ReliabilityLocard's Exchange PrincipleBayesian Reasoning
Theory Briefing
- Pima County Sheriff Chris Nanos confirmed to CBS News that forensic testing on hair found at Nancy Guthrie's home is now complete.
- Hair evidence is notoriously limited — microscopic analysis alone can't confirm identity, and even DNA results depend on whether a root is present.
- The sheriff's direct media statement signals the investigation has reached a point where findings are ready to be communicated publicly.