A few examples. Please tell us how many of these are on gun-free zones
http://www.cnn.com/2013/09/16/us/20-deadliest-mass-shootings-in-u-s-history-fast-facts/
8 killed - March 29, 2009 - In Carthage, North Carolina, 45-year-old Robert Stewart kills a nurse and seven elderly patients at a nursing home. In May, the Moore County district attorney announces she will seek the death penalty. On September 3, 2011, a jury finds Stewart guilty of second-degree murder. Stewart is sentenced to 141 to 179 years in prison.
8 killed - October 12, 2011 - Eight people are killed during a shooting at the Salon Meritage in Seal Beach, California. The suspect, Scott Evans Dekraai, 41, of Huntington Beach, is arrested without incident as he is trying to leave the scene. The eight dead include Dekraai's ex-wife, Michelle Fournier, 48. He was armed with three guns -- a 9 mm Springfield, a Smith & Wesson .44 Magnum, and a Heckler & Koch .45 -- and was wearing body armor during the shooting rampage.
8 killed - August 3, 2010 - Manchester, Connecticut - Omar Thornton kills eight co-workers at Hartford Distributors before turning the gun on himself. Thornton had been asked to resign for stealing and selling alcoholic beverages.
8 killed - January 19, 2010 - Christopher Speight, 39, kills eight people at a house in Appomattox, Virginia. He surrenders to police at the scene the next morning. February 2013, he is sentenced to five life terms plus 18 years.
8 killed - March 29, 2009 - In Carthage, North Carolina, 45-year-old Robert Stewart kills a nurse and seven elderly patients at a nursing home. In May, the Moore County district attorney announces she will seek the death penalty. On September 3, 2011, a jury finds Stewart guilty of second-degree murder. Stewart is sentenced to 141 to 179 years in prison.
8 killed - December 5, 2007 - In Omaha, Nebraska, 19-year-old Robert Hawkins goes to an area mall and kills eight shoppers before killing himself.