There was a fan pick qestion on your fav ada and people talked about that casey was a suspect of soemthing before ada on the toon 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!

X Eline

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