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Ballistics and Firearms Examination
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Ballistics Slow motion bullet 1:00 (same as opening day) http://www.youtube.com/watch?NR=1 &feature=endscreen&v=emP5D9Klssg
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*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
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*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?
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*Gunpowder China – circa 1000 Used for fireworks & celebrations Sulfur Charcoal Potassium nitrite
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History of Firearms Hand Gonne –Circa 1400
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History (con’t) Flash Pan –Circa 1400s –1:30 http://www.youtube.co m/watch?v=6LiCUUU WuFw http://www.youtube.co m/watch?v=6LiCUUU WuFw
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*History (con’t.) Mid-19 th Century
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Rifle bullets
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Inside bullet
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*Ballistics: The study of the dynamics of projectiles 4 min http://www.youtube.com/watch?v=m64Clfs Xe_4http://www.youtube.com/watch?v=m64Clfs Xe_4
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*Rifling Machine
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*Rifling Patterns
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Manufacturing of Firearm Barrels *The results of rifling gives a barrel its class characteristics * Association of Firearm and Tool Mark Examiners Glossary 4th Edition
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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)
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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
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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 -.357 of an inch in diameter. A "9mm"
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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
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*Bullet Characteristics
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The Next Advance
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Bullet Identification Lands and Grooves Rifling Pattern
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Test Firing
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Bullet comparison
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*Firearm (class) Characteristics
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Striations (individual)
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Cartridge Cases
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Shotguns
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Shotgun loads
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10 gauge 12 gauge 16 gauge 20 gauge http://www.youtube.com/watch?v=BnT723 O5fZg http://www.youtube.com/watch?v=BnT723 O5fZg http://www.youtube.com/watch?v=5_Omu MTer8khttp://www.youtube.com/watch?v=5_Omu MTer8k
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Different size shot
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Terminal Ballistics
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Gun firing at slow motion shows cartridge ejection.30 http://www.youtube.com/watch?v= rth7YNtvbn8
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ice block bullet proof? 2:30 compare hand guns and shot gun http://www.youtube.com/watch?v=VYnrrjd tVys&feature=relmfuhttp://www.youtube.com/watch?v=VYnrrjd tVys&feature=relmfu
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Different bullets FMJ vs hollow point slow mo 2:00 http://www.youtube.com/watch?v=v92Sj4X VKNw&feature=relmfuhttp://www.youtube.com/watch?v=v92Sj4X VKNw&feature=relmfu
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Residue on Hands
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Soot on Hands or gunshot residue (GSR)
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Distance Determinations
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Intro to IBIS 4:00 http://watchmojo.com/index.php?id=7527
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Ejector or extractor markings
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Guns firing 3:00 http://www.youtube.com/watch?v=KA- O9iyggVQhttp://www.youtube.com/watch?v=KA- O9iyggVQ
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Muzzle Stamp
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Contact
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Tatooing
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Distance Determinations 3 inches 9 inches
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Blowback
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Bill Bass skull examination 5:00 http://www.youtube.com/watch?v=7h2aOD JzWw8http://www.youtube.com/watch?v=7h2aOD JzWw8
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Wound Ballistics
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Wound Ballistics: Types of Bullets
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slow mo bullets impact.30 http://www.youtube.com/watch?NR=1&fea ture=fvwp&v=XUXmFYsfzkshttp://www.youtube.com/watch?NR=1&fea ture=fvwp&v=XUXmFYsfzks
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Wound Ballistics
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shooting under water 1:00 http://www.youtube.com/watch?v= 0WIIKje1g2s&feature=related
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Firearms negligence http://www.youtube.com/watch?v=Et33bbA 0GeMhttp://www.youtube.com/watch?v=Et33bbA 0GeM
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Firearmsid.com Go to classroom log in Student login code: C37246Forensics Do the virtual comparison microscope
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