In an analysis of fatal and nonfatal shootings in Boston, he and co-authors found that detectives were equally likely to make arrests during the first two days of an investigation, but as time went by and the cases grew cold, they were far less likely to arrest the perpetrators of nonfatal shootings. Based on the number of shootings in 2019, department analysts figured FAST would investigate 100 shootings in its first year (another unit would continue to handle shootings with a clear nexus to gangs), so Bisgard asked to handpick 10 detectives. “We have lots of complaints about police department practice — ShotSpotter, halo cameras, gang unit practices, regulation of police misconduct and police violence — but this particular unit, it’s just not that visible to us.”