1. (Discussion and Begin Worksheet - Firearms)
Tuesday February 28, 2017
(Discussion and Begin Worksheet - Firearms)

2. The Daily CSI
Friday, 2/23/18
None Today!

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4. Summative or Formative #
Assignment
Summative or Formative #
Date Issued
Gone Missing Day
Last Day Accepted
QUIZ 12 S3
2/26
Friday

5. Firearms: A Quick History
Almost every gun is based on the same simple concept: You apply explosive pressure behind a projectile to launch it down a barrel.
The earliest & simplest application of this idea is the cannon.

6. The first hand-held guns were essentially mini-cannons; you loaded some gunpowder & a steel ball & lit a fuse.

7. War typically resulted in the need for improved weapons technology.
In the late 1800’s, the revolver quickly became popular due to it’s size & quick loading.
It only had to be reloaded every 5-6 shots instead of after each shot.

8. Handguns have reigned supreme for the past 200 years, and to this day remain the most popular and readily available firearm.

10. Firearms Identification
Often confused with the term ballistics
Ballistics is the study of a projectile in motion.
Inside the firearm
After it leaves the firearm
When it impacts the target

11. Firearms Identification
Identification of firearms is based upon this basic idea:
A harder object marks a softer one & imparts/transfers its microscopic irregularities to that object.

12. Questions Facing the Forensic Firearms Expert
Did a suspect use this gun to kill that person?
Did these bullets come from that gun?
Was it really self-defense?
Is this a case of suicide, or is foul play involved?

13. Forensic Firearms Expert
Bullet Comparison
Weapons Function
Is it safe? Has it been modified?
Serial Number Restoration
Gunpowder Residue Detection
on clothes, hands, & wounds
Muzzle-to-Target Distances

14. Pulling the Trigger Pulling the trigger releases the firing pin…
The firing pin strikes the primer…
The primer ignites the gun powder…
The powder generates gas that propels the bullet forward through the barrel & ejects the spent cartridge case.

19. Caliber: the diameter of the gun barrel
Caliber: the diameter of the gun barrel. In guns, particularly firearms, caliber is the approximate internal diameter of the barrel, or the diameter of the projectile it fires. 
Caliber is recorded in
hundredths of an inch (.22, .38, .44, etc.)
millimeters (7mm, 9mm, etc)

20. World’s Most Powerful Handgun?
Smith and Wesson 500 with its “little” brother the 44 magnum.

21. Begin Worksheet Firearms