On February 14, 2018, a former student fired a semiautomatic AR-15 rifle at Marjory Stoneman Douglas High School in Parkland, Florida, killing 17 and injuring 15 more. The Parkland students turned to social activism, creating the #NeverAgain movement. Since the 2012 Sandy Hook massacre, 239 school shootings have occurred.1 In political debates, gun rights advocates often invoke the Second Amendment as an obstacle to gun control, but the Supreme Court has left ample space for a well-regulated firearms environment.