In the wake of yet another "school shooting" (unlikely to be as advertised), I was reminded of a Darren Brown episode on a similar topic.
I don't know enough about Darren Brown to determine if this entire thing is fake or real. But it does seem genuine. Some of Brown's work clearly has an effect on people, so this could be legit.
Either way, it is an interesting demonstration of how a person could (at least, theoretically) become an MKUltra mind control assassin -- from identifying a target person who could be manipulated, to the process of slowly training him to commit murder, to then blocking it from his mind, ensuring that he could never testify as to what happened, because he really does not know (of course, killing him before he can talk is even more effective, and is the typical modus operandi).
Brown did not use drugs, but consider if drugs were added to the mix by a "therapist," and it sure seems possible to do something like this.
The video is 45 minutes for the full episode, but you can't really "get it" by just watching a couple of clips. You have to watch the entire process to understand it. Very interesting.
Darren's demonstration would indicate that the person is in a state of mind where he does not realize he is killing someone.
How do you think that communists have killed millions of people, historically? They get people to change their perception of reality.
That's why you have to watch the entire thing.