Red Squirrel
No Lifer
Technically you're not suppose to, but I've never seen a store actually check the signature against something. Heck the signature is all faded out on mine and I never bothered to resign it. They're not going to ask you for ID or anything. So as long as you know their pin you're pretty much golden. When I lived at my parents' my mom would send me to the store to buy stuff with her card all the time.