From a friend – Was able to get rid the mice and rats – chewing – trying to get in under their country home.
Used popcorn with heavy oil and coated it with plaster of Paris (use paper bag for mixing and avoid inhaling the powder) – kills them right away – gives them a belly ache then they die. No harm for those that eat the dead bodies.
No more rats on video camera. A done deal.
Other resources: https://www.farmshow.com/a_article.php?aid=22264
The mixture constipates and kills squirrels and other rodents, but has no harmful effect on predators that may eat the dead animals.
Plaster of Paris safety data sheet – see page 4 http://www.dap.com/media/53532/00079010001english.pdf