sane cop
insane cop
naive cop
sane cop gets the right results
insane cop gets the wrong results
naive cop thinks everyone is innocent
but you dont get told what kinda cop you are in your PM, so like i said when you cant even trust yourself its difficult.
there are other investigative roles too, though. if there are only 3 mafia, that left 8 townspeople.
1 doctor, 1 cop, 1 deputy. may well be another cop, and others. but then there might not eve be 3 mafia i dont know.