Ballistics and Firearms Examination
Ballistics Slow motion bullet 1:00 (same as opening day) &feature=endscreen&v=emP5D9Klssg
*Ballistics 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, path through the air, and path through a target. Internal travel: within the firearm External travel: from firearm to target Terminal travel: hitting the target
*Questions To Be Considered What sort of weapon was involved? From what distance & direction was it fired? What type of projectile was fired? Can the projectile be matched to the weapon? Can the cartridge case be matched to the weapon? Was the shooting accidental or deliberate? Who fired first?
*Gunpowder China – circa 1000 Used for fireworks & celebrations Sulfur Charcoal Potassium nitrite
History of Firearms Hand Gonne –Circa 1400
History (con’t) Flash Pan –Circa 1400s –1:30 m/watch?v=6LiCUUU WuFw m/watch?v=6LiCUUU WuFw
*History (con’t.) Mid-19 th Century
Rifle bullets
Inside bullet
*Ballistics: The study of the dynamics of projectiles 4 min Xe_4http:// Xe_4
*Rifling Machine
*Rifling Patterns
Manufacturing of Firearm Barrels *The results of rifling gives a barrel its class characteristics * Association of Firearm and Tool Mark Examiners Glossary 4th Edition
Class Characteristics All class characteristics are measurable 123 CaliberCaliber Number of lands and groovesNumber of lands and grooves Width of the lands and groovesWidth of the lands and grooves Direction of twist (left)Direction of twist (left)
Manufacturing of Firearm Barrels *Each barrel has four class characteristics 1.Caliber (bore diameter:.357,.22,.45) 2.Number of lands and grooves 3.Direction of twist 4.Width of the lands and grooves
Caliber *Caliber of bullet is referring to the size of the bullet in inches, or millimeters. A ".357 Magnum" has a bullet which is, as you probably guessed of an inch in diameter. A "9mm"
Theory of Firearm Identification Marks produced by the random imperfections or irregularities of tool surfaces, corrosion, or damage. They are unique to that tool and distinguish it from all other tools.* Bullets and cartridge cases can be compared using marks left on them through their contact with a firearm. * Association of Firearm and Tool Mark Examiners Glossary 4th Edition
*Bullet Characteristics
The Next Advance
Bullet Identification Lands and Grooves Rifling Pattern
Test Firing
Bullet comparison
*Firearm (class) Characteristics
Striations (individual)
Cartridge Cases
Shotguns
Shotgun loads
10 gauge 12 gauge 16 gauge 20 gauge O5fZg O5fZg MTer8khttp:// MTer8k
Different size shot
Terminal Ballistics
Gun firing at slow motion shows cartridge ejection.30 rth7YNtvbn8
ice block bullet proof? 2:30 compare hand guns and shot gun tVys&feature=relmfuhttp:// tVys&feature=relmfu
Different bullets FMJ vs hollow point slow mo 2:00 VKNw&feature=relmfuhttp:// VKNw&feature=relmfu
Residue on Hands
Soot on Hands or gunshot residue (GSR)
Distance Determinations
Intro to IBIS 4:00
Ejector or extractor markings
Guns firing 3:00 O9iyggVQhttp:// O9iyggVQ
Muzzle Stamp
Contact
Tatooing
Distance Determinations 3 inches 9 inches
Blowback
Bill Bass skull examination 5:00 JzWw8http:// JzWw8
Wound Ballistics
Wound Ballistics: Types of Bullets
slow mo bullets impact.30 ture=fvwp&v=XUXmFYsfzkshttp:// ture=fvwp&v=XUXmFYsfzks
Wound Ballistics
shooting under water 1:00 0WIIKje1g2s&feature=related
Firearms negligence 0GeMhttp:// 0GeM
Firearmsid.com Go to classroom log in Student login code: C37246Forensics Do the virtual comparison microscope