Unit 10 - Firearms, Ballistics & Impressions

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Final Exam

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6 Terms

1
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Rifling

Spiral grooves

<p>Spiral grooves </p>
2
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Grooves

Areas where some barrel metal are removed to make depression

<p>Areas where some barrel metal are removed to make depression </p>
3
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Significance of gunshot residue/tests

Gunshot residue discharges from the barrel of the gun, or sometimes from every opening. A color spot test is used to detect substances like nitrates in gunpowder and gunshot residue can also explain where a gun was fired.

<p>Gunshot residue discharges from the barrel of the gun, or sometimes from every opening. A color spot test is used to detect substances like nitrates in gunpowder and gunshot residue can also explain where a gun was fired. </p>
4
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What evidentiary marks would you expect to find on a casing?

Breech marks, firing pin impression, extraction and ejector marks, headstamps

<p>Breech marks, firing pin impression, extraction and ejector marks, headstamps </p>
5
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Significance of comparison microscope

After ballistic experts test fire a bullet, they use a comparison microscope to view the bullet they fired with the one found at the crime scene to compare their patterns that the barrels gave them

<p>After ballistic experts test fire a bullet, they use a comparison microscope to view the bullet they fired with the one found at the crime scene to compare their patterns that the barrels gave them</p>
6
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What evidentiary marks would you expect to find on a bullet?

Barrel groove and land impression

<p>Barrel groove and land impression </p>

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