Invisibility, version 2

 
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An idea that came to me. The mafia has a plethora of techniques available to them depending upon who they janitor. The cop can find mafiosos who are not lawyered, while the tracker can find those who do not vote no one. If the tracker finds the lawyer, though, it's nearly game over for the mafia. Vig replaced with watcher in this setup, for extra reports.