I've read two true crime books lately in which the murderer used Arsnic to kill their victims, and it doen't show up on autopsy normally. One of the symptoms besides severe stomach pains and diahrrea is problems walking.
It's a bit far fetched , I'll admit, but arsnic is available to farmers for rodent control, and Scott's customers were farmers.
It's possible. It's so hard, when the poor corpse is missing the head. I imagine they could and did test for poisoning. I would think it would show up. Some of us speculated that maybe he drugged her with the date rape drug. Because we heard, I think, that there was something about that on his computer. Then, with her totally unconscious, she'd have been easy to kill.
There's a thing about poison, though. I don't know why, but more women than men use poison. Maybe b/c the average woman is less directly confrontational than is the average man. Clearly both sexes have their EVIL persons, but the methods vary. From what I've read, only a small percentage of male murderers use poison, and it takes a certain type of personality. Maybe Scott would fall into this "non-confrontational" category, I don't know.
Hey, you know what? This girl was (IMO) more sick than usual during her pregnancy. She was having dizzy spells, she was needing to use a wheelchair and be helped to her car... arsenic poisoners usually use more than one dose, b/c the stuff collects in the system and kills the victim over time. Brrrr! It could be! Only one more problem: would gradual doses of arsenic have killed the baby? Or caused a miscarriage? (Some substances don't cross the placenta, wonder if arsenic is one of them?) The poor little baby was alive and well in December, we know that...