India, April 13 -- Amid the search for Nancy Guthrie, DNA expert and genetic genealogist CeCe Moore said that she believes investigators should return to the missing woman's Tucson home to search for more DNA evidence. Moore stressed that DNA on the bite flashlight a masked man was seen using in doorbell camera footage needs to be examined with extra care.

Moore explained that even though crime scene investigators may have already collected numerous DNA samples, they might have missed key evidence like saliva from the bite flashlight. She added that this could be a "hardy" source of the perpetrator's DNA, even weeks after the incident.

"DNA is hardy. So it's certainly possible there is still some DNA there, and in particular, I really d...