The FBI's Domestic Investigations and Operations Guide (DIOG) was first issued to help implement the new Attorney General's Guidelines for Domestic FBI Operations that were issued earlier in 2008. DIOG was original released on December 16, 2008, by FOIA request, and reissued in October 15, 2011, with updated definitions of terms and procedures.
The guide "applies to all investigative activities and intelligence collection activities conducted by the FBI within the United States or outside the territories of all countries. This policy document does not apply to investigative and intelligence collection activities of the FBI in foreign countries; those are governed by The Attorney General's Guidelines for ExtraterritoriaFl BI Operations."
The guide's purpose is "standardize policy so that criminal, national security, and foreign intelligence investigative activities are consistently and uniformly accomplished whenever possible (e.g., same approval, notification, and reporting requirements)."