We have just been using traps. Our cats catch and eat the mice, so I cann't risk bait. I am a bit worried about them getting poisioned just from all the surrounding houses though. Went for a walk to the park a couple of days ago and saw so many dead mice on the way (which was fun trying to stop the dogs from eating them all - yuck!), obviously alot of people have been baiting them and they have been going outside to die.