Firearms, Tool Marks and Other Impressions

1
Chapter 15

• Firearms, Tool Marks and Other Impressions
• 17 things to know

2
Firearms

• Why do the barrels of guns have grooves?
• Shotguns are sometimes called smoothbores

3
Firearms

• A comparison microscope can be used to compare
  two bullets. What factors can make this
  comparison difficult?

4
Firearms

• What can make distinctive markings on the shell
  or cartridge of a bullet?

5
Firearms

• IBIS?

6
Firearms

• What is the relationship between the gunpowder
  particles and the distance the weapon was fired?

7
Firearms

• What can detect gunpowder residue patterns?

8
Firearms

• What is the gauge of a shotgun?

9
Firearms

• What does the choke on a shotgun do to the
  pellets?

10
Firearms

• The dermal nitrate test often has false positives
  due to what substances?

11
Firearms

• What happens to GSR as time goes by?

12
Firearms

• What techniques are used for detecting GSR?

13
Firearms

• How does an investigator reveal the serial number
  on a gun?

14
Firearms

• What should be done when a gun has been recovered
  from water?

15
Firearms

• Bullets that have been discharged should be
  handled carefully to avoid damaging what
  evidentiary material?

16
Tool Marks

• What should an investigator do with tools and/or
  tool mark evidence?

17
Imprint

• How should shoe and tire marks be processed?

18
Class vs. Individual

• What are class characteristics?