The hunt for  Nancy Guthrie  in her cold case may have just hit a turning point ... because the FBI is using new technology to zero in on DNA evidence. Law enforcement sources tell TMZ that agents are analyzing what could be a crucial sample recovered from the 84-year-old’s Tucson, Arizona home ... and it’s already been sent through a private lab working with the Pima County Sheriff's Department before landing in federal hands. This is the same DNA evidence that was recovered from Nancy’s home

Tag-uri: DNA