1. 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?

3. 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.

4. How its caused? What can it lead to?

5. Firing Pin Mark Breech Mark Ejector Mark Rifling (land and grooves) Striae

6. Rifling

9. Firing Pin Mark

15. Breech Marks

18. Extractor Marks

21. Striation Marks

22. Description Type of Evidence What can it lead to? How is it caused? Word Front and Back Bullet caliber Lands and grooves Cartridge case Head stamp Striae Firing pin marks Breech marks Extractor marks illustration