These pesticides are easily obtained at any drug, grocery or home improvement store.
Pesticides are poisons.
This means they kill living things, plain and simple. The same poison you purchase to eliminate your gopher problem could also kill a golden eagle, your dog, or your cat. Commercial pesticides generally kill in one of two ways. Some are anti-coagulants which, when consumed, cause massive internal bleeding. Other pesticides affect the central nervous system, causing total body paralysis.