Using poison as a rat killer.

Poison is effective as a rat killer, but its use is actually somewhat limited. Rat poison is not to be used near little children or house pets. Also, the trouble with poison is that when the rat dies, it usually dies someplace where you can't find it. So rats have a tendency to die in the walls, attic, or ceiling and all you can do is notice the nasty odor but are unable to find the body.