When I have to use bait, I use broudificon, which is a warfarin type product, and has an effective treatment available. It's getting harder to find, which is sad, because the bromothelin products are much worse. Read the fine print on the packages to find it. Last year I stuffed bait blocks in the 'rat holes' and they covered them over, and checked twice daily. When there was no more activity, and the bait was no longer being eaten, I filled everything in again. Good luck! Ugh! Mary