millimeter weapon in the open field in between the binneys' home and the crime scene. scientists fired a test bullet and compared it to the bullet from the crime scene. >> just like looking through a pair of binoculars. you're actually looking at one specimen on the left stage, one specimen on the right. and you're looking for commonality of markings between the two items. >> the test left no doubt. the gun found in the field was the murder weapon. investigators discovered evidence in binney's room that proved the gun was in his possession. >> we found blue jeans that had one unspent, .9 millimeter bullet in the pocket. we found a holster, magazine holders, and a security badge, as well as some other items that related to the possession of a gun.