It's interesting to note that these anticoagulant pesticides are so feared in terms of secondary poisoning to non target animals. Coumadin(Warfarin) is widely used on humans to treat and prevent heart attacks and strokes. Also, any accidental poisonings can be counteracted with vitamin k which is readily obtained from any pharmacy. Typically I haven't seen any for sale to the general public that has any attractant like honey or molasses.
Pesticides, if used as per the labelling, is safe and these directions and restrictions are reviewed by the EPA.
In my office ,when I was still working, we dispensed anticoagulant grain and wax impregnated blocks for the control of rodents and in thirty years of doing so, never once was there ever a reported incidence of secondary or unintended poisoning.
Some pesticides referred to in a previous post, is not available to the general public and only used by professionals.
Strychnine is sold as a bait for gophers and moles and, if used as per the labelling requirements, is placed in holes and under ground. When the animal dies, it dead underground.