National Instant Criminal Background Check System (NICS)
Public Mass Murderers and Federal Mental Health Background Checks
Firearm Inquiry Statistics (FIST) program (Bureau of Justice Statistics)
The Firearm Inquiry Statistics (FIST) program collects information on firearm applications and denials and combines this information with the FBI's National Instant Criminal Background Check System (NICS) transaction data to produce an estimated number of background checks for firearm transfers or permits since the effective date of the Brady Act in 1994.