Objective: Students will be able to describe the class and individual characteristics of bullets and

cartridge cases.

Do Now

1.Turn in your outline/lecture.2.What is rifling?3.How are striations formed?4.What information can a

cartridge casing give?

Students will be able to explain how breech marks, firing pin marks, ejector marks, striation and rifling patterns are used as class and individual evidence.

How its caused?What can it lead to?

Firing Pin MarkBreech MarkEjector MarkRifling (land and grooves)Striae

Rifling

Firing Pin Mark

Breech Marks

Extractor Marks

Striation Marks

Description Type of Evidence

What can it lead to?

How is it caused?

Word

Front and Back

Bullet caliberLands and groovesCartridge caseHead stamp

StriaeFiring pin marksBreech marksExtractor marks

illustration