CNN CNNI Simulcast February 25, 2015 07:55:00
Guardian. the doctor says even exposing young teens to the environment dangerous. >> it's another family gaming activity right? wrong. i don't think it's just another activity. i think this is something that can seriously affect child development and not in a good way. >> reporter: he points to the incident last year at an arizona shooting range -- >> turn it forward -- >> reporter: where a 9-year-old girl firing an usze accidentally shot and killed an instructor. here at machine gun america, children under 13 aren't even allowed inside. and 13 to 16-year-olds are only allowed to shoot a subma...