There was a fan pick qestion on your fav ada and people talked about that casey was a suspect or soemthing before ada on the show what episode was that??

Yes, she was a suspect in the raping of a male stripper in the episode link (S03E10). She was first seen as ADA Casey Novak in season 5.

Hope this helped!

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It was the episode called "Ridicule", Season Three, Episode Ten. link