I don't even have to justify my calling ko a liar, but I will I KNOW he is not the cop because the cop would have investigated someone and to randomly reveal themselves as a cop is stupid do you see an undercover cop against the mafia suddenly blowing his cover wide open like that? I sure as hell don't. If the doctor protects the "cop" ko and ko is mafia then his protecting the mafia and the mafia will know who the doctor is which means the real cop will get whacked when they reveal themselves because doctors can't protect themselves only others.