Philip J. Cook & Jens Ludwig, Guns in America, 1996, available at http://www.policefoundation.org/pdf/GunsinAmerica.pdf. 2,568 individuals, including 251 gun owners, were surveyed by telephone and asked how they obtained their firearms.  In the 38 states that have not fully closed the private sale loophole, an estimated 9,856,984 background checks were conducted between November 2011 and November 2012, out of an estimated 16.5 million total firearm transfers in those states. 40 percent of this total—6.6 million transfers—occurred without background checks. Calculation based on FBI data. Available: http://www.fbi.gov/about-us/cjis/nics/reports/20130205_1998_2013_state_program_to_date_purpose_ids.pdf  Daniel Webster, Jon Vernick, & Maria Bulzacchelli, "Effects of State-Level Firearm Seller Accountability Policies on Firearm Trafficking," Journal of Urban Health, July 2009.  U.S. Department of Justice, Federal Bureau of Investigation, Supplementary Homicide Reports, 2011.  Centers for Disease Control and Prevention, National Center for Injury Prevention and Control. Web-based Injury Statistics Query and Reporting System (WISQARS) [online]. (2005) [cited 2012 Dec. 20].  Uniform Crime Reports, FBI, 2011. An aggravated assault is an unlawful attack with the purpose of inflicting severe or aggravated bodily injury and using a weapon or means of inflicting severe harm, including assaults or attempts to kill or murder, assault with a deadly weapon, and mayhem. Law enforcement agencies in 46 states and DC submitted sufficient data for analysis — NY, IL, HI, and MS did not.
SOURCE Mayors Against Illegal Guns