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Recovery and evaluation by cytologic techniques of trace material retained on bullets.
Fragments of tissue, intermediate targets, and debris related to firing are embedded in the fine striations and deforming edges of bullets. Because most of these fragments are too small to visualize and process as histologic sections, this material is usually washed away when the projectiles are cleaned following removal at autopsy. By preserving the rinsing material that results from routine cleaning of projectiles, it may be possible to evaluate adherent material from the bullet by cytologic techniques, including filter preparations, cell blocks, and smears of macroscopic tissue fragments. Bullet-wash cytology produced cellular elements, tissue fragments, and inert material from intermediate targets. Different tissue elements could be documented with a given projectile; this information could be utilized to document the path of a bullet through the body or intermediate target. This initial study suggests that low- and high-velocity projectiles produce different types of tissue debris, with much more fragmentation and scarcity of cellular components in the high-velocity rounds. Inert material, resulting from intermediate targets, such as clothing, as well as gunshot residue on the bullet or debris from the barrel could be distinguished on preparations. There was a difference in tissue representation of adherent material on the bullet; connective tissue, mesothelial coverings, and fragments from organs with higher elastic and cohesive properties were seen with much greater frequency on the filters than were loosely cohesive and friable organs such as liver and spleen. The cytologic preparations from projectile washings reflect both the path taken by the bullet and the ballistic damage to the organs. Thus, the cytologic evaluation of bullet washings may be useful in the incorporation of gunshot wound evaluation to support documentation of the trajectory of the projectile.
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