If it happened to him, it's encoded in his brain. Even if we have to remove it to get to the memories, we have the technology. And if he's having flashbacks, then it's not all gone, is it?
And the trouble with your comic was the pacing. Keris would immediately haul you all to a jail equivalent, he wouldn't stop to chat. So by having Keris pause, despite the fact that your character claims to have information on a murder case he is under great pressure to solve, you undermine his motives.