Chapter 17-18

33 terms by randy-berry 

Ready to study?
Start with Flashcards

Create a new folder

Advertisement Upgrade to remove ads

VHCC

Firearms Identification

A discipline mainly concerneed with determining wheterh a bullet or cartridge was fired by a particular weapon; it is not to be confused with ballistics, which is the study of a projectile in motion

Grooves

The cut or low-lying portions between the lands in a rifled bore

Rifling

The Spiral grooves formed in the bore of a firearm barrel that impart spin to the prjectile when it is fired

Bore

the interior of a firearm barrel

Lands

The raised portion between the grooves in a rifled bore

Caliber

The diameter of the bore of a rifled firearm; the caliber is usually expressed in hundreadths of an inch or millimeters

Gauge

Size designation of a shotgun, originally the number of lead balls with the same diameter as the barrel that would make a pound.

Extracter

The mechanism in a firearm by which a cartridge of a fired case is withdrawn from the chamber.

Ejector

The Mechanism in a firearm that throws the cartridge or fired case from the firearm.

Distance Determination

The Process of determining the distance between the firearm and a target, usually based on the distribution of powder patterns or the spread of a shot pattern.

Choke

An interior construction placed at or near the muzzle end of a shotguns barrel to control shot dispersion.

Greiss Test

A chemical test used to develop patterns of gunpowder residues around bullet holes.

land

The ___ is the original part of the bore left after rifling grooves are formed.

comparison microscope

The single most important instrument for comparing bullets is the ________

False

If bullets were fired in succession from the same weapon, all the individual characteristics would always be identical

smooth

A shotgun has a_____barrel

False

Shotgun pellets can be individualized to a single weapon

NIBN

The automated firearms search system developed by FBI and ATF as a unified system incorporated both DRUGFIRE and IBIS technologies available in prior years is known as

tool mark

A ______is any impression caused by a tool coming into contact with another object

striations

Tool marks compare only when a sufficient number of ______ match between the evidence and test markings.

a photograph and liquid silicone cast

Objects bearing tool marks should be submitted intact to the crime lab or a ____________________ _______________

lifting sheets or a electrostatic lifting device

An imprint may be lifted using

photography and casting.

Shoe and tire marks impressed into soft earth at a crime scene are best preserved by

individual characteristics

wear pattern can impart ___________ __________to a shoe

Exemplar

An authentic sample used for comparision purposes, such as handwriting.

natural variations

Normal deviations found between repeated specimens of an individuals handwriting or any printing device.

Erasure

The removal of writing, typewriting, or printing from a document; it is normally accomplished by either chemical means or an abrasive instrument.

Infrared Luminescence

A property exhibited by some dyes that emit infrared light when exposed to blue-green light.

Obliteration

The blotting out or smearing over of writing or printing to make the original unreadable.

Charred Document

Any document that has become darkened and brittle through exposure to fire or excessive heat.

Indented Writings

Impressions left on papers positioned under a piece of paper that has been written on.

Duration, Balance, Wording, Pronouns, Placements, Social Intro, emotions, omissions, time, connections, editing,

Handwriting Analysis

Red and Blue Fibers, Watermark on right, color shifting ink, security thread, microprint.

What to look for on the Dollar Bills

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set