When police arrest a suspect who is then convicted of the crime, it is a rare exception rather than the rule in the US.
— Read on theconversation.com/police-solve-just-2-of-all-major-crimes-143878
Commentary: How can the Criminal Justice System be this massive trap of Mass Incarceration when only 2% of the crimes that carry the longest prison sentence end in conviction. I’m not sure how plea deals are calculated seeing that 90% of all court cases end in a plea deal. Some of the thoughts here are that criminals are prolific and they eventually get caught, so the arrest of one criminal may stop 20-30 future crimes. Some criminals commit very few crimes and stop either forever or for long periods of time.
NOTABLE: Publications from the links in the article
How Effective Are Police? The Problem of Clearance Rates and Criminal Accountability
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3566383
Most violent and property crimes in the U.S. go unsolved
https://www.pewresearch.org/fact-tank/2017/03/01/most-violent-and-property-crimes-in-the-u-s-go-unsolved/
Alternatives to Arrest for Young People
https://www.nlc.org/resource/alternatives-to-arrest-for-young-people/
Future of Policing 