What's your motivation behind this comment? Do you really want to live in a world where some of humanity's greatest achievements are seen the same as random garbage? In any case, current brain scans are crude, but they measure function, not data. It's like putting an ammeter over an ethernet cable. You're not going to be able to see the data flowing over the wire, but you'll definitely be able to tell that data isn't flowing when it should be. You can also physically inspect a computer and see when a capacitor has blown.