I believe it should work with some kind of brain waves(telepathy?), apparently some kind of device you put in your head and it read information from your brain, the spooky question would be if there is a way to make a device like that to be able to read information from someone's brain remotely. IDK this looks like a bad idea but anyway it's already here, according to the information I believe there will be more places where law get updated about it.
Edit: maybe it could be used for interrogation also, I mean you could know if someone it's saying the truth or not by reading their brain.