DECEMBER 8, 2015 EQ: How is bullet analysis & comparison used to identify weapons used to commit a crime? WARM-UP: (DC snipers news) https://www.youtube.com/watch?v=hcZ_IRKzJzE.

Slides:

Advertisements

Similar presentations

Firearms and Toolmarks

Advertisements

Ballistics & Firearms.

Question The inner surface of the barrel of a gun leaves its markings on a bullet passing through it. These markings are peculiar to each gun. Would these.

Firearms Identification

Chapter 15: Firearms, Tool Marks, and Other Impressions

Ballistics & Impressions

BALLISTICS AND BULLET MATCHING. COMPONENTS OF BALLISTICS TRAJECTORY PROJECTILE CLASSIFICATION PROPELLANT TYPE GUN-POWDER RESIDUE FIREARM TYPE.

1.  The term ballistics refers to the science of the travel of a projectile in flight.  The flight path of a bullet includes: travel down the barrel,

Preview What is firearm identification?

Forensic Ballistics Part B.

Firearm Identification & Ballistics

Firearms Identification Mr. Tomasevich Forensics.

Forensic Ballistics.

Forensic Ballistics. What is Ballistics? Ballistics is the science that deals with the _________, behavior and effect of a projectile. Ballistics is the.

 Rifling-impressing of the inner surface of a gun barrel with spiral grooves. › Imparts spin to projectile to keep it on course › No two barrels have.

Ballistics and Firearms Examination. Ballistics Slow motion bullet 1:00 (same as opening day) &feature=endscreen&v=emP5D9Klssg.

Impression Evidence Firearms Examination Tom Anderson.

BALLISTICS The big picture of ballistics Because every contact leaves a trace (Locard’s exchange principle) very hard contacts (like a 180 mps to.

1 What is ballistics? Give 3 examples of how ballistics is used in forensic science.

FIREARMS, TOOL MARKS, AND OTHER IMPRESSIONS

 Definition: any material that travels with the ability to injure  Energy is dependent on the velocity, mass, and distance traveled by projectile.

Chapter 17 Ballistics.

Ballistics YouTube - Bullets in Slowmo. Ballistics The study of Ballistics involves the: Comparison of bullets and cartridge cases. Knowledge of all types.

CJ386-Unit 4 Review Fingerprints are a means of personal identification No two fingerprints have ever found to be identical Class characteristics-basic.

Ballistics Chapter 15 p

1.Casing- Shell casing of the bullet when the gun is fired 2.Fragment- a piece of a bullet. 3.Residue- Bullet holes or GSR (the gunshot residue) THREE.

Bullet ID Lab.  Macroscope mag 5-40X  Water tank to obtain the standards for the bullet.

Flammables and Firearms. Flammable Liquids The search for flammable fluids in arson cases should include a thorough examination of the entire fire scene.

Crime Scene Photography by Professor Bob Warnock and Jerry Dambrogio.

Forensic Ballistics.

Bullet Analysis & Comparison bsapp.com. Bullets to Guns ► It is extremely difficult to convict some one of a murder without possession of the murder weapon.

Forensic Science: Fundamentals & Investigations, Chapter 17

Firearms Identification. Forensic firearms examinations identification of a bullet, cartridge case, or other ammunition component as having been fired.

Hosted by Mrs. Koenig Looks Scary Big Shots Force of Nature Evidence

1 Introduction Ballistic evidence helps explain: o What type of firearm was used o The caliber of the bullet o The number of bullets fired o Where the.

What happens to bullets when they are fired? bsapp.com.

Firearms Identification. A discipline mainly concerned with determining whether a bullet or cartridge was fired by a particular weapon.

Cartridges Design The bullet, usually made of metal, is out front with the cartridge, holding the primer and propellant powders, behind. Change Your Life.

Firearms & Bullets.

1 What is ballistics? Give examples of how ballistics is used in forensic science.

Ballistics Intro to Firearms 1. Forensic Science: Fundamentals & Investigations, Chapter 17 2 Long Guns and Handguns o Long guns Rifles fire bullets Shotguns.

Question The inner surface of the barrel of a gun leaves its markings on a bullet passing through it. These markings are peculiar to each gun. Would these.

Unit 5: Firearms, Tool Marks, and Other Impressions

Ballistics. History of Gunpowder and Firearms The Chinese invented gunpowder over a thousand years ago using KNO 3, charcoal and sulfur. Muzzle-loading.

Firearms and Ballistics

Chapter 15 FIREARMS, TOOL MARKS, AND OTHER IMPRESSIONS

The study of bullets and firearms

Forensic Science: Fundamentals & Investigations, Chapter 17

Gunshot Residue Analysis

Ballistics By the end of this chapter you will be able to:

Firearms Identification

1835 Henry Goddard of Scotland Yard use a bullet comparison to solve a murder. He traced a flaw in the bullet’s shape to the pistol of a suspect.

Firearms & Tool Marks Forensic Science.

(Discussion and Continue Worksheet - Firearms)

The study of bullets and firearms

Chapter 17 Ballistics By the end of this chapter you will be able to:

Firearms & Toolmarks Chapter 9.

Bullet Analysis & Comparison

Ballistics Chapter 15.

What happens to bullets when they are fired?

ANALYZING FIREARMS EVIDENCE

Forensic Ballistics.

Bullet Analysis & Comparison

What happens to bullets when they are fired?

The Smoking Gun.

Ammunition and Shell Casings

Forensic Firearm Identification, Ballistics, and Tool Marks

16-1 Bullet and Cartridge Comparison

Presentation transcript:

DECEMBER 8, 2015 EQ: How is bullet analysis & comparison used to identify weapons used to commit a crime? WARM-UP: (DC snipers news) https://www.youtube.com/watch?v=hcZ_IRKzJzE https://www.youtube.com/watch?v=s4wofmm8P1g https://www.youtube.com/watch?v=vEE-rfEDUxk View the following video clip on the “Beltway Snipers” and write and answer the following questions. 1. According to the video, how many people were killed? 2. Who was responsible? 3. What was their motive? 4. What were the consequences? 5. Were there any regrets from the accused? If so, what? bsapp.com

Bullet Analysis & Comparison http://www.smithsonianchannel.com/videos/the-snipers-bullets/17006 bsapp.com

Bullets to Guns It is extremely difficult to convict some one of a murder without possession of the murder weapon. In the case of a shooting, matching a bullet with a gun is essential in most cases. bsapp.com

Ballistics Characteristics of ammunition, firearms, and residue are examined to find matches between suspects and the evidence found at a crime scene.

Chemical tests can reveal gunshot residue (GSR) on the hands, face, or clothing of a victim or suspect to indicate how close a person was to a fired gun.

Gunshot Distance Analysis

Rifling (grooves) in a gun barrel causes distinctive grooves, indentations and scratches upon fired bullets, which can be matched to the weapon that fired them.

Bullets become scared by rifling as they travel down the barrel of a gun. This is due to the grooves in that barrel causing the bullet to spin. This spin allows for a true and accurate course upon leaving the barrel. bsapp.com

Striations bsapp.com

bsapp.com

bsapp.com

bsapp.com

bsapp.com

Police are able to search the Integrated Ballistics Identification System (IBIS) database to compare markings from bullets, cartridge cases, and shotgun shells to ballistic evidence.

Shotguns Shotguns have a smooth barrel, therefore there are no striations to compare for analysis.

What happens when the bullet hits its target? The results depend on the speed and shape of the bullet and the characteristics of the target. Most bullets will mushroom Some will disintegrate

Matching Procedure Analysts use a comparison microscope to compare the striations on the bullet to the grooves in guns to determine the gun that shot the bullet. Upon collection care must be taken to not harm the striation for correct analysis to occur.

Matching Procedure Fire bullets from a suspected weapon With the aid of a comparison microscope, compare these “test fires” to the suspected bullets Striations must be identical for a positive match bsapp.com

bsapp.com

bsapp.com