I’m not sure of the actual cutoff, but I remember reading about a police department in CT a few years ago that gave IQ tests to job applicants—and then turned down those who scored too high.
The theory was that police work was dull and repetitive and that officers with too high an IQ were likely to quit too soon after training.
It's worse than that. A young man I know was in in the academy to become a police officer. He dropped out after it became quite clear that police agencies are not interested in having a cop who had any tendency to understand what he was supposed to do as opposed to what he was ordered to do.