I saw that Gmaestop store sell used Iphone, Ipod, and Ipad from people who had them, but I really want to buy a Ipod from one of my local gamestop store. To me, I am scare to buy on because I don't if the previous owner will hack into they all iPod touch, Iphone , Ipad when I am using it. I want to know how does it work?

I am guessing that they reset these devices before selling them again.

They are restored to factory defaults.

Yes, the equipment is sent into a service center and checked out, refurbished and put to default condition.

It is perfectly safe.