That makes too much sense for public safety and the taxpayers.
The ACLU and the Civil Rights division of the Justice Dept. have been on a rampage against jurisdictions that hire only qualified and competent people.
You are not too far off the mark on your last sentence. Affirmative action, pushed and supported by the ACLU and the feds, has had a very negative impact on police depts. I don’t have any statistics, just anecdotal evidence, which isn’t considered evidence.
IQ ratings have zippo to do with whether someone goes nuts or not.