Won't work like that. If qwerty and Psy or Laddy are both Mafia, the one that is Mafia will say that qwerty is innocent and the one who isn't Mafia will say guilty. Qwerty will say he is town, and get us to lynch the one who said he is guilty. If normal cop, we know he is lying.
Of course this doesn't work if qwerty=town.






