the body was the bullet core passing through an intervening object. it very likely would have stripped off the copper jacket and only the core would have proceeded from that area. >> he has an epiphany. i think he said, that's it. he got up and went down to a sporting goods store and bought some of those bullets, went home, took one out and cut it open in his garage and that's got to be it. >> most lead bullets are made from recycled car batteries which have numerous trace elements. a forensic metallurgist at the fbi analyzed the lead inner core of the bullet from bruce dodson's body using plasma atomic emissions spectroscopy. it was compared to the .308 caliber round found at the scene. >> so she tested for a certain number of -- i think it was six or eight trace elements. when you compare them, there was a match.