Federal investigators are turning to newly enhanced DNA analysis techniques as they continue searching for answers in the disappearance of Nancy Guthrie, the 84-year-old woman who vanished from her Tucson, Arizona home.

According to a report, a Florida-based laboratory that works with the Pima County Sheriff’s Department forwarded previously collected DNA evidence to the FBI. The bureau is now applying updated technology to reexamine the sample, even though it is not newly obtained, ABC News reported.

Authorities have indicated that the genetic material recovered from Guthrie’s residence does not belong to a single individual. The PCSD has said the DNA recovered from Guthrie’s home came from more than one person, according to the outlet.

The sheriff added that several additional laboratories across the country—up to five—are also contributing to the investigation, though it remains unclear whether any new DNA evidence is currently under review.

Roughly two dozen investigators from both the Pima County Sheriff’s Department and the FBI are still actively working the case, but meaningful breakthroughs have been slow since Guthrie, the mother of NBC News co-anchor Savannah Guthrie, disappeared on February 1.

{Matzav.com}