Juan Becerra in Deseret news maintains that no evidence linked powder to Prop. 8.
"FBI sending suspicious powder to headquarters," Deseret News, November 17, 2008, accessed April 29, 2021
The FBI has labeled its probe a domestic terrorism investigation. Becerra would not say whether the agency had identified any suspects in the case, but reiterated Monday that the FBI had no evidence that linked the threats to Prop. 8 or its opponents.