Truth Solves the Crime

Who's the one person who knows better than anyone else that he's the one that did it? You know, that's the best evidence. You can close your eyes and recall scenes from the past. We haven't figured out yet how to tap into someone's brain and view those images yet. But, when we have! Mandrake the magician figured out how to do it 20 years ago I don't know how - he even got people to project the images on a screen from their eyes. This would be the most foolproof evidence. Only question is how.