Yes. The Bell Curve actually has a passage on this question, when the NYC police department used a cognitive test in 1939 as the major part of its application

Yes. The Bell Curve actually has a passage on this question, when the NYC police department used a cognitive test in 1939 as the major part of its application process. Those officers attained higher ranks and had fewer disciplinary problems. It doesn't mention the attrition rate, though. https://twitter.com/charlesmurray/status/1267111560566235138 https://twitter.com/charlesmurray/status/1267111560566235138