32 CFR § 147.24 - The national agency check.
The National Agency Check is a part of all investigations and reinvestigations. It consists of a review of;
(a) Investigative and criminal history files of the FBI, including a technical fingerprint search;
(b) OPM's Security/Suitability Investigations Index;
(c) DoD's Defense Clearance and Investigations Index;
(d) Such other national agencies (e.g., CIA, INS) as appropriate to the individual's background.
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