I've read a lot of stories and was cruising around on theCrimeLibrary.Com and a lot of the women were using rat poison as a means to eliminate their husbands and other forms of "human pests"
These seem to have happed before the 1950s. I read that rat/mouse poison works by stopping the blood from clotting. But it seems this is not the same as it was when these women were poisoning their husbands.
First of all did they reformulate rat poison? If so what used to be in it, say before the 1950s?