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EXCERPTS from BASIC FIREARMS IDENTIFICATION Lucien C. Haag Criminalist Forensic Science Services, Inc. Carefree, AZ 85377 Prepared for.

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Presentation on theme: "EXCERPTS from BASIC FIREARMS IDENTIFICATION Lucien C. Haag Criminalist Forensic Science Services, Inc. Carefree, AZ 85377 Prepared for."— Presentation transcript:

1 EXCERPTS from BASIC FIREARMS IDENTIFICATION Lucien C. Haag Criminalist Forensic Science Services, Inc. Carefree, AZ Prepared for DCA Vince Imbordino

2 PRINCIPLES OF FIREARMS IDENTIFICATION CALIBER DESIGNATIONS Caliber relates to the nominal inside dimensions of the barrel

3 PRINCIPLES OF FIREARMS IDENTIFICATION FOUR COMMON RIFLING ARRANGEMENTS Direction of Rotation Rt Lt

4 PRINCIPLES OF FIREARMS IDENTIFICATION: Class Characteristics Imparted to Fired Bullets RIGHT TWIST LEFT TWIST

5 Examples of Fired Bullets Right Twist Left Twist

6 SLIDE BREECHFACE EXTRACTOR FIRING PIN EJECTOR SOURCES of MARKS on CARTRIDGE CASES

7 extractor breechface SLIDE removed from a Semi-Automatic Pistol Support Area for the Cartridge

8 extractor Live Cartridge loaded from the Magazine Slide retracted ejector

9 ejector mark firing pin impression EJECTOR MARK on an Extracted and Ejected Cartridge Case Impact site Typical ejectors are located at the 7 to 8 oclock position

10 CARTRIDGE CASE EJECTION from a SEMI-AUTOMATIC PISTOL slide barrel Ejector

11 STYLIZED BREECHFACES with VARIOUS TOOL MARKS FIRED CARTRIDGES

12 STYLIZED BREECHFACES and VARIOUS EJECTOR SHAPES FIRED CARTRIDGES with EJECTOR MARKS

13 Summary of Markings on Cartridge Cases

14 BASIC FIREARM and TOOLMARK IDENTIFICATION Lucien C. Haag Criminalist Forensic Science Services, Inc. P.O. Box 5347 Carefree, AZ end-


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