SALEM, Ore. (AP) — Every public school district in Oregon last year was given the option to ban guns from their properties. Oregon Public Broadcasting reports that most have declined to do so. Since a change to Oregon law in September, only 13% of the state’s public school districts have opted to close an exemption that allows holders of a concealed handgun license to carry weapons onto public property where possessing a gun would otherwise be a felony. The slaying of 19 children and two teachers at an elementary school in Uvalde, Texas, has many Americans demanding measures to narrow access to firearm. Gun rights groups, meanwhile, insist having armed citizens nearby during an attack could limit damage from mass shootings.