@MeBigbrain @Druid @WashedOutGundamPilot Also I am not sure Columbo would fare too well. Most of his tricks rely on the murderer being a high society polite sort who appreciates charm and wit. In a situation where handing his business card to Light could lead to a heart attack, the writers would need to have their thumbs on the scale hard for him to figure that out early enough to not make that mistake. He has amazing instincts but THAT amazing would be a stretch.

That said, if he does figure it out before Light gets his name its all over for Light.