I have several mousetraps and the most successful so far is the plastic trap “Times Up One Touch”. Newfield, importers of Electronic Pest Control Devices Sonic Guard and Ultimate, said there are restrictions on the devices. A Newfield spokesperson said rodents can get used to ultrasound, so it’s a good practice to turn them on and off and move the device. There is no evidence that electromagnetic and ultrasound devices are an effective means of combating rats and mice. The best way to have a rodent-free home is to make sure they have no way at all. This means blocking any potential entry points that rats and mice are likely…