A neighbor had chickens in a coop where she left a lot of cracked corn attracting rats. She took the chickens now but the rats are spreading. I called a professional exterminator and he suggested that we should use the bait "contrac" in the professional bait stations. I have chickens and cats and it worries me. We've never had issues with rats and we've had the chickens for a long time. We do not leave out the food like the neighbor. Please help! I'm very stressed and don't know what to do. Has anyone here used "contrac"?