An important thing to add about traffic analyst is that it's an "anti-swing" alignment cop since it checks if someone has another player they are able to legally talk to at night, so once mafia is down to only one member left it stops returning positive results on the mafia because they have no one to talk to at night.
Generally makes balancing setups easier because unlike more swingy roles (e.g Tracker who gets stronger as more mafia die) which can lead to snowballing, it gets weaker as town is doing better (well, specifically once mafia is down to only one player, but it still falls under the anti-swing category)
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Marshmallow Marshall