Genetic genealogy eyes DNA clues in Nancy Guthrie mystery

Investigators in the Nancy Guthrie case in Tucson are pursuing genetic genealogy to turn DNA evidence into a suspect lead, a method credited with solving the Golden State Killer and other cases; a DNA sample from gloves near her home did not match CODIS, and authorities are also reviewing commercial databases as they analyze additional biological evidence; experts say this approach builds family trees from relatives to identify suspects, though questions about privacy linger.