his levels to be very high. >> what did you find in this case? >> his levels are consistent with someone who has fired a firearm, certainly, but they are not extremely high. >> >> the defense argued that brian did have gunshot residue on his hands, proving he could've killed tammy. >> certainly that is not the only way in which gunshot residue can be had, but it is consistent with firing a gun. >> and there was the prosecutions theory that the gun in brines hand had been placed there after his death. that he could never have held on to it after being shot himself. the state claims that it would've been impossible for brined to have that gun in his hand, given the severe injury that he sustain to his arm? >> the -- many people have a death grip. if you are shot and you have something in your hand, you squeeze it tighter. >> and the idea that brian would never have had a gun?