 That's George Tita, a professor of criminology, law, and society at the University of California, Irvine. He says the vending machines raise a new set of concerns. They could end up selling ammo to people who aren't legally allowed to own a gun, like those convicted of felonies or certain domestic violence crimes. And they can't look out for warning signs that a customer might use it to hurt themselves or others. A vending machine is not going to be able to say, hey, are you okay? Or why do you need this ammunition?