The National Violent Death Reporting System (NVDRS) is a good source of data on fatal police shootings

HICRC compared the NVDRS data on fatal shootings of civilians by law enforcement officers in the United States with 5 open-source data sets (FatalEncounters.org, Mapping Police Violence, the Guardian’s ‘The Counted,’ Gun Violence Archive, and the Washington Post’s ‘Fatal Force Database.’)  NVDRS captured 97% of the possible incidents.  NVDRS also provides comparable and detailed circumstance information about these deaths.  Open-source data is highly useful for real-time data and non-fatal injuries.  The National Institute of Justice funded article, “Validating the National Violent Death Reporting System as a source of data on fatal shootings of civilians by law enforcement officers” by Andrew Conner, Deborah Azrael, Vivian Lyons, Catherine Barber and Matthew Miller appears in the American Journal of Public Health, 2019 109:578-584.