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

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Presentation on theme: "J.M. Saloom FIREARMS/TOOLMARKS ACDLA SUMMER SEMINAR Joseph M. Saloom."— Presentation transcript:

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

3 Alabama Department of Forensic Sciences Brief History

4 J.M. Saloom

5 Alabama Department of Forensic Sciences Firearms / Toolmarks Laboratories: Huntsville Birmingham Montgomery Mobile

6 J.M. Saloom 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.

7 J.M. Saloom 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.

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

9 Cartridge

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

11 Rimfire Cartridge

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

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

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

17 Rifling

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

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

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

21 J.M. Saloom MEASURED WIDTH OF BULLET LAND MEASURED WIDTH OF BULLET GROOVE 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 bullet groove Louise Walzer, JPSO Crime Lab Important information for the no gun case...

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23 Comparison Microscope

24 BULLET COMPARISON

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

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

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

28 J.M. Saloom Breech Firing Pin

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

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

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

32 CARTRIDGE CASE COMPARISON

33 Cartridge Case Comparison

34 Shotshell

35 J.M. Saloom Shotshell components

36 J.M. Saloom

37 Additional firearm related examinations Clothing examination for gunpowder Location of holes and other defects in clothing Serial number restoration Ballistic determinations Fingerprints

38 Gunshot Residue

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42 Gunshot hole in shirt

43 Gunpowder Particles

44 J.M. Saloom

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49 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

50 Toolmark

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54 J.M. Saloom

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57 Additional toolmark related examinations Wire striation matches Fracture matches

58 Wire cover extrusion marks


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