I found this https://www.npr.org/sections/money/2021/04/20/988769793/when-you-add-more-police-to-a-city-what-happens https://www.npr.org/sections/money/2021/04/

I found this https://www.npr.org/sections/money/2021/04/20/988769793/when-you-add-more-police-to-a-city-what-happens https://www.npr.org/sections/money/2021/04/20/988769793/when... an excerpt about a study by Morgan C. Williams Jr. that states their study shows more police does reduce crime in an area. In looking for this I ran into a lot of statistics especially those that show crime has largely dropped since the early 90's but peoples perception of non-local crime has gone up. I blame the media.