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Running out of options: Expert raises concerns about Nancy Guthrie probe as FBI uses fresh tech to crack case
A UCLA professor warns the Nancy Guthrie case has hit a hurdle as the FBI re-examines existing evidence with new DNA technology. A mixed DNA sample from Nancy Guthrie's Arizona residence is being analyzed by a private Florida lab partnered with the Pima County Sheriff's Department, with investigators aiming to crack the case while acknowledging ongoing challenges.
Why It Matters
The development highlights the use of advanced forensic techniques and collaboration with private and national labs to pursue leads in a high-profile missing-person case, even as results may take considerable time.
Timeline
1 Event
FBI obtains new DNA sample from private Florida lab working with Pima County Sheriff's Department
April 19, 2026
The FBI recently received a DNA sample collected at Nancy Guthrie's residence in Arizona from a private Florida laboratory that partnered with the Pima County Sheriff's Department. Agents are applying advanced forensic techniques to the evidence in hopes of cracking the case. The sample is described as mixed, containing genetic material from more than one person. Sheriff Chris Nanos noted that the new evidence presents major challenges and warned that results could take weeks, months, or perhaps a year. A UCLA criminal justice professor highlighted that mixed DNA samples can be difficult to isolate into a single usable profile, and suggested the FBI’s use of fresh technology indicates investigators believe a suspect's DNA is present but not yet extractable. The sheriff's office continues to work with the FBI, labs across the country, and forensic examiners to sort through thousands of hours of video footage.