Well, we have to do that, it is role fishing, but good fishing, see if someone comes forward and says "Yuna's lying, I'm a cop" we expose our cop and catch a scummer impersonating a cop, good trade consideirng the alternative. The dilemma was - which is why I has a post just to discuss this - that a tracker could indicate are insane cop if we had one, and we'd pretty much have to bite the bullet on that. So in that respect you're right, the question is role fishing - well, openly trawling with a fog horn, a net, and a harpoon anyway - for other investigator roles.