[1] https://en.wikipedia.org/wiki/Gun-Free_Schools_Act_of_1994
[2] https://en.wikipedia.org/wiki/Columbine_High_School_massacre
[3] https://www2.ed.gov/admins/lead/safety/threatassessmentguide.pdf
[4] https://www.mprnews.org/story/2015/03/18/red-lake-shooting-explained
[5] https://www.britannica.com/event/Virginia-Tech-shooting
[6] https://www.congress.gov/bill/110th-congress/house-bill/2640
[7] https://www.cnn.com/interactive/2012/12/us/sandy-hook-timeline/index.html
[8] https://www.history.com/this-day-in-history/parkland-marjory-stoneman-douglas-school-shooting
[9] https://bja.ojp.gov/program/stop-school-violence-program/overview
[10] https://www.everytown.org/solutions/extreme-risk-laws/
[11] https://www.cnn.com/2022/05/27/us/uvalde-texas-elementary-school-shooting-friday/index.html
[12] https://www.nytimes.com/article/nashville-school-shooting.html