There were no cups of tea I'm afraid, and no biscuits either.
I've met killers. No serial killers, as such. The first killer I met was a man known to most as Jameson. He only killed once. Who did he kill? A complete stranger and for no reason at all. There was no personal motive or aggression. A psychopath? He was never diagnosed. I have met a couple of diagnosed psychopaths in my lifetime. For him, the event was classified as being a result of temporary insanity. He got off fairly lightly. Not the usual jail term for murder.
He was more than willing to speak with me. He laughs as he tells me stories of the prison psychologists. The clueless incompetence of those who strip away at the individual and attempt to peg any disorder they can to force others into a mold as they see fit. The rapists of thought patterns.
I have also met some of the more emotional killers. They are always more revealing of their discomfort. They deny my leading assumptions and questions in relation to violent acts. But I know they killed. I have access to records they cannot imagine. You can see a shadow behind their eyes expressing their own denial. They wouldn't even qualify as being pathological liars though. The lies are so see through and they do little to cover up for their more obvious denial.
Is there anything of a killer still inside? Not with these emotional killer types or perhaps some insist on portraying a facet. I have many facets for different situations myself. That is why I analyse them. One cannot hold up a facet forever, perhaps a few hours or more before you start to see what's truly lurking underneath. I have many interesting little 'tricks' to get there.