Desperate federal investigators weigh using DNA genealogy websites for Nancy Guthrie case

Authorities trying to solve the disappearance of Nancy Guthrie say they might tap DNA genealogy databases, the same step that police took to unravel a decades-old series of murders in California and the fatal stabbings of four college students in Idaho.

The strategy could be fruitful: If unidentified DNA evidence can be connected to someone — even a distant relative — in a common genealogy database, it would give investigators more information and possibly lead to a suspect in Guthrie’s kidnapping in Arizona.

“It’s a fantastic tool,” said Ruth Ballard, a geneticist in California who specializes in DNA and has testified in hundreds of court cases. “If it’s a good quality sample and they’re able to get a profile, they could find a hit on that fairly quickly.”

The sheriff’s department in Pima County, Arizona, said DNA collected so far in the investigation has not turned up any matches in a national criminal justice database known as CODIS, which has DNA profiles from........

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