A National Agency Check and Inquiries (NACI) is the minimum level of investigation required of Federal employees as a condition to employment with the Federal government and now for contract employees as a condition to access to Federal facilities and information systems. It is essentially a check of law enforcement records, and written inquiries to schools, police departments, and other references to verify your status. The required background investigations, in turn, require a fingerprint check of each individual. Background investigations, including fingerprint checks, have been required of Federal employees by Executive Order 10450, in effect since 1953. HSPD-12 and FIPS 201 expanded the persons and positions that require such investigations.