Resources for US college and university campuses' gun policies

— -- After airing our “20/20” report, "A Chance Encounter," about the 2015 shooting at Northern Arizona University, we wanted to provide our viewers with some resources that feature gun policies on colleges and universities across the country. Below are just a few we have provided links to, but we encourage viewers to not solely rely on these websites and to do their own research on the policies of specific colleges and universities.

ArmedCampuses.org – This website offers a clickable map with information about campus gun policies in all 50 states. http://www.armedcampuses.org/

National Conference of State Legislatures' (NCSL) Guns on Campus – Information regarding which states ban or allow concealed carry weapons on colleges campuses and states that have introduced legislation regarding guns on campus. http://www.ncsl.org/research/education/guns-on-campus-overview.aspx#1

Student Affairs Administration in Higher Education (NASPA) and Education Commission of the States (ECS) – Annual report regarding state legislative action and higher education system policy decisions on states that have permitted or prohibited guns on campus. http://www.naspa.org/rpi/reports/guns-on-campus-the-architecture-and-momentum-of-state-policy-action