Arsenic sticks around and today it's easily found after death if somebody thinks of looking for it, because the problem with arsenic, it isn't looked for in the common tests for drugs.
“As a father now, I wouldn't do what my dad did, because it left me feeling emotionally unstable as a kid. But he didn't do the things he did out of selfishness or malice.”
“I thought I would be an organic chemist. I went off to university, and when I couldn't understand the chemistry lectures I decided that I would be a zoologist, because zoologists seemed like life-loving people.”