From the document: "The statistical tables below provide the number of firearm transaction applications checked by state points of contact and local agencies, the number of applications denied and the reasons for denial, and estimates of applications and denials conducted by each type of approval system. Data are also provided on appeals of denied applications and arrests for falsified applications. The Regional Justice Information Service (REJIS) prepared these tables under the supervision of Devon B. Adams and Allina D. Boutilier, of the Bureau of Justice Statistics [BJS]. Terry J. Tomazic, Professor of Sociology at Saint Louis University, served as statistical advisor and Dave Naglich at REJIS assisted with data analysis on the project. The tables were prepared under BJS cooperative agreement #2009-BJ-CX-K006. The BJS sponsored Firearm Inquiry Statistics (FIST) program collects information on firearm background checks conducted by state and local agencies and combines this information with Federal Bureau of Investigation (FBI) National Instant Criminal Background Check System (NICS) transaction data. NCJ 231679."
United States Bureau of Justice Statistics: http://bjs.ojp.usdoj.gov/