Jon Schuppe writes about crime, justice and related matters for NBC News.
"It's not going to bring her back," Irene Wilkowitz said of using genetic genealogy to search for her sister's killer. "But it will help other people."
"There are cases that won't get solved or will take longer to solve," a Florida law enforcement official said.
Motorola Solutions is among the tech firms racing to deliver new ways of monitoring the public.
Detroit's police chief says facial recognition is making the city safer. Some residents fear it could create a surveillance state.
Hundreds, perhaps thousands, of people accused of marijuana possession have seen their cases dismissed or put on hold thanks to new hemp laws.
"We as a country should know how many people die in our custody. Period," a researcher said.
Dozens of law enforcement agencies have used Amazon-powered technology to modernize crime fighting — but critics raise fears of privacy abuses.
"Why the emphasis on red flag laws? It's something we can do," one researcher said.
The self-imposed moratorium was welcomed by civil rights and privacy advocates ─ but with skepticism.
A fatal police shooting in South Bend, Indiana, was not captured by the officer's body camera, prompting "understandable anger," Mayor Pete Buttigieg said.