What in the hell? No.
Everyone had a piece and only peach was effected by the poison. I tried the cake the poison bowser and the autopsy report and each time at the point where it said everyone had a piece. So fuck it. I'm right and this game sucks. Or maybe it doesn't and I'm just a dried up bitter bitch who sucks at games. Either way, make it much more clear what the fuck your supposed to do next time please. Thank you.