Sample of two, but it makes the point.
I worked with a guy who had a degreein, and had worked in the field of, aerospace engineering. But he was an awful cop because he was a lazy, arrogant coward.
Another partner had a GED. But he was fearless and cared more about the people he served than anyone I've seen.
A college degree requirement will weed out the unintelligent. But the things that make a good cop can't be taught. They can be honed and practiced, but not learned.