STUDIES:   

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"[Bureau of Justice Statistics] ARD program captured approximately 49% of law enforcement homicides, while the [FBI’s] SHR captured 46%. An estimated 28% of the law enforcement homicides in the United States are not captured by either system."

Arrest-Related Deaths Program Assessment: Technical Report Arrest-Related Deaths Program Assessment: Technical Report
Arrest-Related Deaths Program Assessment: Technical Report
RTI International
Banks, Duren / Couzens, Lance / Blanton, Caroline / Cribb, Devon
NCJ 248543, March 2015
https://www.bjs.gov/content/pub/pdf/ardpatr.pdf
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