I had a terrible rat and mouse problem about 4 years ago. I mentioned this to several people at a poultry show in Peoria. They gave me a method to use poison and still have my poultry and family cats be safe. I use 2 foot sections of 3" pvc pipe. Drill a hole in the center of the pipe to pass a wire thru the center of rat bait bars. Wire the bar securely so it can not be pulled out. Pipe has to be open at both ends to get rats regularly where with mice it doesn't seem to matter. Rats want to see a way out. I placed them in the pens and near the entrance points to the building. It can be place safely along rat runways and you will see a difference in several days. It can be placed outside along side of buildings and under poultry sheds. I always have one out and have no problems anymore. Never have had any animal except target rodents hurt with this method. The other thing is to remove as much food as possible each day late so they have to eat the rat bait. I used almost 1 lb of bait the 1st night and 3/4 lb the next night then by the 5th night I wasn't getting any hits. I used 4 pipe bait stations initially.