Agreed. Learnt that one from experience, under my bed, behind the fridge, in the floor boards....I'd be slow to use poison in the house. Mouse eats poison - mouse goes off to die somewhere within house - mouse stinks out the house as it decays.
Traps that kill them instantly are the way to go, leave them where you've seen evidence of the mice.
Glue traps are very effective, but incredibly cruel, and you need to have a strong stomach to clear them