AFTE Store - Fired Bullets and the Implications for Comparison During Different Stages of Human Decomposition: A Pilot Study

This study examines the effect of decomposing human tissue on an examiner’s ability to identify a fired bullet to a common source firearm. Full metal copper jacketed bullets were placed in various regions in and near the bodies of two human donors at the Northern Michigan University Forensic Research Outdoor Station (FROST) during the summer of 2019. Two bullets were placed in each of the selected regions so one could be left in situ (in position) during the entire data collection period, and one could be repeatedly removed and replaced to assess the effects of decomposition at shorter time intervals. Over time, individual characteristics in the land impressions became dulled and less distinct, and pitting became apparent in the copper jackets due to the exposure of decomposition byproducts and metal oxidation. Bullet location and the length of time of exposure to decomposition were analyzed for their relationships to changes in bullet condition.