Originally Posted by WebSlave

I guess it serves the same purpose as the security cameras you see in retail shops. You know they all can't be manned all the time, but you know that SOME of them might be. And there are instances where particular persons become of "special interest" and need a closer eye kept on them, so I presume the mods prefer doing it in such a way so as to not change a person's actions artificially by letting them know they are under closer scrutiny.