“Responding officer reports a non-responsive gunshot victim with multiple shell casings near the body.” This initial report is all too familiar for police personnel in many U.S. communities, as firearm homicides have steadily increased for several years. In 2017 alone, 14,542 people in the United States were feloniously killed with a gun, making three of every four homicides firearm homicides. More than half of all homicides in 55 major U.S. cities over the last decade remain unsolved. Communities disproportionately impacted by firearm violence, like Baltimore, Maryland, and St. Louis, Missouri, have seen major spikes in firearm homicides over the last five years; yet, the rate at which these homicides are solved remains 15 to 35 percentage points below the U.S. average.