"I've come up with some nasty tricks you can play with brain states that I don't even want to record to electrons, though the odds of nobody else ever thinking of them are zero."

Even before we get to minds on chips, there are nasty mind tricks coming ever closer to our reach. Imagine how much more successful an "investigator" at Guantanamo Bay could be during "interviews" if they (unbeknownst to the person being interviewed) had a "pleasure center" or "warm friendly feelings" remote control in their pocket. That just requires advanced brain prosthetics and some surreptitious surgery. An advanced form of putting a euphoric drug in someone's iv when they see you, so they come to like you a lot over time.