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FIREARMS/TOOLMARKS

FIREARMS/TOOLMARKS. ACDLA SUMMER SEMINAR Joseph M. Saloom. Alabama Department of Forensic Sciences Brief History. Alabama Department of Forensic Sciences. Firearms / Toolmarks Laboratories: Huntsville Birmingham Montgomery Mobile. FIREARMS/TOOLMARKS.

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FIREARMS/TOOLMARKS

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  1. FIREARMS/TOOLMARKS ACDLA SUMMER SEMINAR Joseph M. Saloom J.M. Saloom

  2. Alabama Department of Forensic SciencesBrief History

  3. J.M. Saloom

  4. Alabama Department of Forensic Sciences • Firearms / Toolmarks Laboratories: • Huntsville • Birmingham • Montgomery • Mobile J.M. Saloom

  5. FIREARMS/TOOLMARKS • The firearms / toolmarks examiner is responsible for comparing bullets and cartridge cases to a particular weapon or to each other. Examination of clothing for gunpowder residue, and comparing pry marks, cuts, impressions and saw marks back to a particular tool. J.M. Saloom

  6. The scientific theory/basis that we operate under, is that no two items in nature are microscopically identical. Therefore, it follows that no two man-made items are microscopically identical, and we may make determinations based on microscopic comparisons. J.M. Saloom

  7. Routine firearm examinations and results: • Caliber • Make of weapon • Weapon type and model • Safety features and whether they work • Capacity • Trigger pull • Proper function J.M. Saloom

  8. Cartridge

  9. CARTRIDGE CASE PRIMER CUP BULLET ANVIL FLASH HOLE POWDER J.M. Saloom Louise Walzer, JPSO Crime Lab

  10. Rimfire Cartridge

  11. Cross Section of unrifled gun barrel BLANK DRILLED BARREL RIFLEDBARREL J.M. Saloom Louise Walzer, JPSO Crime Lab

  12. BROACH RIFLING METHOD CUTTING BLADES (note imperfections) J.M. Saloom Louise Walzer, JPSO Crime Lab

  13. Button Rifling Side view The button is made of solid carbide and is larger than the reamed bore of the gun barrel. Front view J.M. Saloom Louise Walzer, JPSO Crime Lab

  14. Rifling

  15. - J.M. Saloom Louise Walzer, JPSO Crime Lab

  16. - J.M. Saloom Louise Walzer, JPSO Crime Lab

  17. J.M. Saloom Louise Walzer, JPSO Crime Lab

  18. Important information for the “no gun” case... Winchester 38 special caliber lead bullet • Q-load • 134 grains • six lands and grooves • right twist (possible revolvers: Rossi, Taurus, Spesco) (possible derringers: Excam, Hy-Hunter F.I.E., E.I.G.) bullet land bulletgroove MEASURED WIDTH OF BULLET GROOVE J.M. Saloom MEASURED WIDTH OF BULLET LAND Louise Walzer, JPSO Crime Lab

  19. Comparison Microscope

  20. BULLET COMPARISON

  21. How marks get on the fired cartridge cases. J.M. Saloom Louise Walzer, JPSO Crime Lab

  22. - The firing pin is recessed The firing pin strikes the primer, sending the bullet down the barrel. The back of the primer is slammed back onto the breech. J.M. Saloom Louise Walzer, JPSO Crime Lab

  23. Firing Pin Striking Primer J.M. Saloom Louise Walzer, JPSO Crime Lab

  24. Firing Pin Breech J.M. Saloom

  25. Breech Extractor Firing Pin J.M. Saloom Louise Walzer, JPSO Crime Lab

  26. Rearward movement of Slide after cartridge has been fired Ejection port Breech Slide Extractor Ejection of Fired Cartridge Case J.M. Saloom

  27. FIRED CARTRIDGE CASE - R P BREECH MARKS FIRING PIN IMPRESSION 3 L 8 P S J.M. Saloom Louise Walzer, JPSO Crime Lab

  28. CARTRIDGE CASE COMPARISON

  29. Cartridge Case Comparison

  30. Shotshell

  31. Shotshell components J.M. Saloom

  32. J.M. Saloom

  33. Additional firearm related examinations • Clothing examination for gunpowder • Location of holes and other defects in clothing • Serial number restoration • Ballistic determinations • Fingerprints J.M. Saloom

  34. Gunshot Residue

  35. Gunshot hole in shirt

  36. Gunpowder Particles

  37. J.M. Saloom

  38. J.M. Saloom

  39. J.M. Saloom

  40. J.M. Saloom

  41. J.M. Saloom

  42. Toolmarks examinations and results • What type of tool was involved • Could the tool submitted make the mark in question • Comparison and determination of toolmark match J.M. Saloom

  43. Toolmark

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