Ko that gives us nothing, foa is a proven citizen by voting to lynch Shlup yesterday, why give up a fellow member of the mafia so easily with plenty of other people out there. To have been useful you either would have investigated BtV, Chrono or Cid who are all equally in the position of could be mafias. Now I still don't believe you're a cop. We've already ascertained foa's status. Also I think the real cop would have been more discreet this early in the game and given subtle hints about who they had investigated and their results.