Instead of poison for the varmints, have you tried poison for their food? Most of these varmints eat grubs and bugs that live underground. If you kill those bugs using Diazinon or similar, it'll starve the varmints and they'll either die or move away.Thats how I got the 3 cats that I have now, they don't even put a dent in them. When I first moved here 11 years ago I put poison pellets down 1- hole in the front yard and later when we came home from lunch there was at least 30 of them out of the hole in the front yard. I shot them with a pellet gun and threw them away so the dog wouldn't get them. Point is there are thousands of those holes all over the property and they reproduce faster than you can kill them.