The technology exists to essentially peer back in time across a city and solve major crimes like this.
https://www.wnycstudios.org/podcasts...ticles/eye-sky
While I'm typically saying government needs to stay out of things, the ability to solve serious crimes and reduce the number of detectives on staff and possibly reduce crime seems worthy of an experiment in certain terrible cities. I know, it goes against my signature, but then again, I never considered that people have a right to privacy when they are out and about in public, and all the standard laws of warrant procedure can be applied to this method of data collection.