We use an electronic mouse trap in the house. It seems to work better than the snap traps. Probably because it doesn't matter how careful the mouse is, it just needs to make the connection between the plates. Also, there is no blood, so no smell of dead mouse to warn the next mouse. I think it is probably the most efficient and humane trap I've tried.Rat Zappers
http://www.amazon.com/Rat-Zapper-Ultra-Rodent-RZU001/dp/B00CM859OA/ref=dp_ob_image_garden
I've seen them less expensive than this.