Apparently profmunkin thinks it's first come, first serve in the field of firearms identification.
Boone and Weitzman found the weapon, Lieutenant Day and Detective Studebaker each photographed the rifle in place, Captain Fritz picked up the weapon, Lieutenant Day held the weapon and inspected the bolt to see if there were any fingerprints on it and after determining he could not see any liftable fingerprints on it, Captain Fritz operated the bolt and ejected a live round. Lieutenant Day took possession of the weapon and brought it back to his office for processing.