I know your´re not killing the little bastards, but you set them free, (mushy old git) Spraypaint the next one you catch, then set it free. Ill bet you it will come back knocking on your door.
I did that once, the little furballs paintjob wasnt even dry yet!
I release them in a field about 300 yards from my house so I doubt it's the same ones. I just got woken up by the cat growling with this mouse in his mouth.
Can you see my cat in the picture staring at the mouse?