Investigation Types
National Agency Check (NAC) - An integral part of all background investigations, the NAC consists of searches of OPM‘s Security/Suitability Investigations Index (SII); the Defense Clearance and Investigations Index (DCII); the FBI Identification Division's name and fingerprint files, and other files or indices
when necessary.
National Agency Check and Inquiries (NACI) - This is the basic and minimum investigation required on all new Federal employees. It consists of a NAC with written inquiries and searches of records covering specific areas of a person's background during
the past five years. Those inquiries are sent to current and past employers, schools attended, references, and local law enforcement authorities.
Access NACI (ANACI) - This is a new investigation designed as the required initial investigation for Federal employees who will need access to classified national security information at the
Confidential or Secret level. The ANACI includes NACI and Credit coverage with additional local law enforcement agency checks.
NAC with Local Agency Check and Credit (NACLC) - This is a new investigation which is the same as the ANACI without the written inquiries to past employers, schools attended, etc. It is designed as the initial investigation for contractors at the
Confidential and Secret national security access levels. The NACLC also is to be used to meet the reinvestigation requirement for all individuals (including contractors) who have Confidential
or Secret clearances.
Background Investigation (BI) - This is a more in depth version of the LBI since the personal investigation coverage is the most recent five to seven years. This investigation is required of
those going into highest risk public trust positions (Level 6).
Single Scope Background Investigation (SSBI) - This is the government-wide investigation required of those who need access to Top Secret classified national security information. This background investigation covers the past seven years of the
subject's activities (or to age 18, whichever is less). It includes verification of citizenship and date and place of birth, and well as national agency records checks on the subject‘s spouse or cohabitant, interviews with selected references and
former spouses.
SSBI-Periodic Reinvestigation (SSBI-PR) - This is the required five year update investigation for those who have Top Secret security clearances. It consists of personal investigative coverage of employments and residences since the previous investigation, including interviews with all former spouses
divorced during the coverage period. A search of the Treasury Department's financial d
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