SPOKANE, Wash. - Former National Guard intelligence officer Rafael Davila admits he spent years bringing home secret and top-secret documents, stacking them in his basement and finally in a rented storage locker. He told the FBI he just wanted to read them. Now in a case with ties to the shadowy world of white supremicists and anti-government militias, prosecutors are accusing Davila and his ex-wife, Deborah, of espionage. Investigators are still trying to track down hundreds of files apparently containing information about nuclear, chemical and biological warfare. A federal indictment charges the Davilas with unauthorized possession of sensitive documents during...