That's it: he's the lawman, and they're just suspected criminals; he could fuck with their lives in any number of ways, it just so happens this particular sicko has a fetish for cavity searches. He's sure to get some perverted enjoyment when he's put inside...
Of course his sentence was lenient; the criminal justice system tends to look out for it's own-tbh I'm surprised he's still not on the streets with a gun.