Baltimore has metric shittons of police cameras but it's still a dangerous shithole. Cameras don't stop idiot criminals from criming. Baltimore's police suck and the area sucks because there's massive unemployment, cameras aren't a panacea.
See San Francisco and their use of LPR cameras like Flock combined with drone surveillance.
https://abc7news.com/post/how-sfpds-new-investigation-center...
Etc.