I will add this, though: When I was a cop, there was a test that we had to pass. It wasn't a measurement of our aptitude, though. It was just a measure of our comprehensive skills. I don't think there was such a thing as scoring too high. I think they just wanted us to be above the minimum.
People that came into the front door as a patrol officer had the world open up to them. From there, they could go for the GBI, FBI, State Patrol, Investigations, etc. Those jobs require a fair amount of intelligence but they build on the foundations that are taught at mandate school.
I know this article isn't about the U.S., though. Still, this guy may have gone on to become a great detective or something. He may have moved up the ranks quickly. The way it stands, he was never given a chance.