Balthier was the cop! Well, that was surprising. I never suspected him to be a cop. He never role-claimed it, nor say anything about any results...mmm. This now makes (I think) two confirmed cops, Leila's insane, and Balthier is sane.
This makes [M] Wedge's investigative role-claim (for those still disbelieving of me) slightly less convincing. The town surely can't have three cops running around right?