BTW, I have no problem with killing rats,be it with traps or rat poison. There is some concern when using rat poison because there is a slight chance of getting other animals such as cats, squirrels, or chipmunks.
I used a big humane live trap to try to ketch something that built a large hole in our back yard. All I got was a Squirrel. I relocated it to the woods by a park about a mile away.