Experts say screening tips in Nancy Guthrie’s disappearance is ‘tremendous’ and critical work

An Arizona sheriff’s department got more than 4,000 calls within 24 hours after the release of videos of a masked person on Nancy Guthrie’s porch. Many tips will be worthless. Others could have merit. Experts say one thing’s certain: They can’t be ignored.

Tips can solve crimes — big or small — and eerie images of a mysterious male covered head to toe have been the most significant clues shared with the public during Guthrie’s nearly two-week-old disappearance in the Tucson area.

“It’s...