So I just rewatched the episode with Raye Penber on the bus. He dies that episode. But all L would have to do is backtrack to where that FBI agent was the “day” he died, find out he was on a the hijacked bus, interview everyone who was on the bus and find out from Light’s date that he was there. That would effectively solve Kira and render Light guilty right? There’s no way no one knew where Penber was, and especially if he died that episode along with a criminal in a strange circumstance, wouldn’t that warrant some further investigation? I don’t know, maybe I’m overlooking something. Thoughts?

EDIT: ESPECIALLY since Penber was specifically following Light for a few days leading up to the bus incident. Someone else had to know “okay, Penber is tasked with following Light, that’s what he’s doing right now.” So when he ends up dead, isn’t it immediately known that Light had something to do with it?