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In spite of skyrocketing US police budgets, cities' murder clearance rates are plummeting.
(lemmy.ml)
Article : https://www.npr.org/2023/04/29/1172775448/people-murder-unsolved-killings-record-high
Another graph on budgets
It's much more difficult to "catch a murderer" when there's an expectation of real evidence.
In 1965 they were probably able to pin every murder on the nearest minority with less pushback.