If you don't want the viewers to suspect "guest stars" in a procedural, the first thing you do is NOT CAST A KNOWN ACTOR! Nobody who has seen Suits, Breaking Bad, or Damages is going to believe that the janitor is just a janitor. This isn't Costabile's fault; it's simply laziness on the part of the production team. It says "We don't really give a s**t if you guess the answer in the first 5 minutes; we've already been paid."
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