NCIC is a computerized index of criminal justice information (i.e.- criminal record history information, fugitives, stolen properties, missing persons). It is available to Federal, state, and local law enforcement and other criminal justice agencies and is operational 24 hours a day, 365 days a year.
PURPOSE: The purpose for maintaining the NCIC system is to provide a computerized database for ready access by a criminal justice agency making an inquiry and for prompt disclosure of information in the system from other criminal justice agencies about crimes and criminals. This information assists authorized agencies in criminal justice and related law enforcement objectives, such as apprehending fugitives, locating missing persons, locating and returning stolen property, as well as in the protection of the law enforcement officers encountering the individuals described in the system.
ACCESS CONSTRAINTS: All records in NCIC are protected from unauthorized access through appropriate administrative, physical, and technical safeguards. These safeguards include restricting access to those with a need to know to perform their official duties, and using locks, alarm devices, passwords, and/or encrypting data communications.
USE CONSTRAINTS: Users of the NCIC system will be restricted to only those privileges necessary to perform an authorized task(s).
http://www.fas.org/irp/agency/doj/fbi/is/ncic.htm