Bait stations work just like a fast-food drive-up. The mice can go in, feed on the bait, and then exit the bait station. It does not catch or keep the mice inside. We cannot control where the mice go after they have feed on the bait that is inside, and there is a very small risk (less than 1%) that the mice will die inside your home. There should not be an odor unless they die under a direct heat source such as the refrigerator motor or the furnace. Should the mice exit your home, they will use the same avenues that they used to gain access inside your home.