HI K. I don't have the answer but in our page on obsessive thinking (at our P and NPD forums) I wrote...

I had the opportunity of having a medical student stay with me for two weeks while she was doing an elective at one of the local hospitals. She did a rotation in Pediatric Psychiatry. She told me she had interviewed a 15 year-old patient who had tried to kill her own father. The patient was completely lacking in empathy, and actually thought there was nothing particularly wrong with what she had done. The patient was diagnosed with Antisocial Personality Disorder.

The mother of this very sick 15 year old wanted that girl returned to the home - YIKES - what a danger to the family. This patient was sick, violent and the family was very much in danger. I didn't add that part as it wasn't the focus of our page on obsessive thinking.

So, your son has already made death threats.