The FBI has been blocked from accessing key evidence in the search for Savannah Guthrie's missing mom, Nancy Guthrie, according to a new report. A law enforcement official told Reuters on Thursday, February 12, that the FBI requested that the Pima County Sheriff's Department send physical evidence - including a glove and other DNA - to the bureau's national crime lab in Quantico, Virginia, for processing as their search for Nancy, 84, continues. Per the official, sheriff Chris Nanos has insisted on using a different lab in Florida, delaying the FBI in its ability to help the case.