https://www.theindychannel.com/news/national-politics/the-race-2020/school-districts-removing-police-officers-from-hallways
From disproportionately ticketing students of color to mishandling special needs children, some school districts say School Resource Officers, more commonly called SROs, should no longer be in the halls.
Currently, there are 18 Denver Police officers working as SROs in Denver Public Schools. The board voted to take that number down by 25 percent by the end of this calendar year, and by the end of next school year, there will no longer be a permanent police presence in Denver Schools.
https://www.denverpost.com/2019/05/07/colorado-school-shootings-columbine/
List: Colorado school shootings since Columbine
May 7, 2019: STEM School Highlands Ranch
Dec. 13, 2013: Arapahoe High School, Centennial
Feb. 23, 2010: Deer Creek Middle School, Littleton
Sept. 27, 2006: Platte Canyon High School, Bailey
April 20, 1999: Columbine High School, Jefferson County