Article continues below advertisementAs the case of Savannah Guthrie's mom, Nancy Guthrie, continues, authorities revealed why security camera footage hasn't recovered from her home. "At 2:12 a.m. [local time], software detects a person on a camera, but there's no video available; they had no subscription and therefore it would rewrite itself," Pima County Sheriff Chris Nanos revealed during a press conference on Thursday, February 5. Article continues below advertisementNancy Guthrie's Camera Footage Cannot Be RecoveredSource: NBCNancy Guthries was reported missing on February 1.