Risk of being killed by police use of force in the United States by age, race–ethnicity, and sex. Frank Edwards, Hedwig Lee, and Michael EspositoProc Natl Acad Sci USA August 20, 2019 116 (34) 16793-16798; https://doi.org/10.1073/pnas.1821204116

Militarization fails to enhance police safety or reduce crime but may harm police reputation. Jonathan Mummolo. Proc Natl Acad Sci USA September 11, 2018 115 (37) 9181-9186; https://doi.org/10.1073/pnas.1805161115

The following is not Creative Commons licensed. I have students listen to both episodes of a podcast from This American Life.