Article continues below advertisementFormer FBI Deputy Director Dan Bongino criticized Pima County Sheriff Chris Nanos for his handling of the investigation into the disappearance of Nancy Guthrie, the 84-year-old mother of Today show host Savannah Guthrie.Bongino told Fox News host Sean Hannity it makes "zero sense" that the sheriff's department is not fully utilizing the FBI's advanced technology and resources.Reports indicate Nanos sent a crucial piece of evidence - a glove found near the scene - to a private lab in Florida rather than the FBI's lab in Virginia.