I had a huge rat problems. I did everything that the article suggested before even having read it. I used EVERY kind of traps that I could get me hands on, snap trap, electric trap, rolling log, dive board, Haveaheart, even glue traps, and many more. Some worked once and NEVER again. They learn very fast what a trap does and avoid it. So I resorted to poison, and they never touched it. Meanwhile my chickens were covered by mites to the point that one of them died before I realized they had mites. I used Permethrin, Sevin, and another expensive product, I forget the name, They'd be OK for a while and mites would show up again. This went on for months. The mites were getting inside too. I was at the end of my rope, then, for some reason, they stated eating the poison and they disappeared so did the mites. Occasionally one or two rats would show up and eat the poison and I would be free of rats for weeks. Until they stopped eating the poison again. But the nature helped. A wonderful possum moved into my wood shed and then the rats disappeared for good. It only comes out at nights when the chickens are safe in their coop and I guess eats the rats or their babies. So my rat problem was solved!!