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chap 9

Terms in this set (38)

What are the three most common types of handguns?
Single-shot, revolvers, and semi-automatics
The revolver features several firing chambers. Where are they located?
A rotating cylinder
The barrel of a shotgun: .
Is smooth without the grooves and lands found in rifles.
What is the reason that grooves are rifled into the bore of a gun?
a. The bullet will be made to spin and thus have a true and accurate course on leaving the barrel.
The comparison of two bullets is possible with a comparison microscope. Such a comparisonis made difficult by what fact?
a. Lands and grooves are subject to wear and tear, and hence striations markings are susceptible to continuing change. b. Often, evidence bullets are distorted on impact and only small areas are found withintact markings., c. The presence of grit and rust can to some degree alter the markings on bullets fired through the same barrel.
Generally, the gauge of a shotgun is _directly related____ to the diameter of its barrel.
a. Directly related
What can make distinctive markings on shells and cartridges?
a. Extractor and ejector mechanism, b. Magazine. c. Breech face mark
What are IBISes?
Automated screening tools for firearm evidence
Generally speaking, the amount of gunpowder particles found around a bullet hole is _
inversely related____ to the amount of distance from which the weapon was fired.
Gunpowder residue patterns can be detected by what?
a. The Greiss test, b.Infrared photograph, Chokes are sometimes found on shotguns to constrict the end of the barrel.
The speed and distance traveled by pellets fired from a narrow choke is __
greater than___ the speed and distance traveled by pellets fired from a shotgun with a wide choke.
The "dermal nitrate test" has fallen into disfavor because of
its lack of specificity.
Which of the following common materials is not one of the substances that give a misleading positive reaction to this test
chocolate
The likelihood of detecting gunshot residues on swabs taken from living subjects more than six hours after a firing has occurred is _
less than____ the likelihood of detecting gunshot residues within two hours of a firing.
Which technique of detecting gunshot residues holds the most promise for the immediate future
scanning electron microscope (SEM) testing
When an etching agent is applied to a metal surface in order to restore a removed serial
number, the stamped area will dissolve at __
number, the stamped area will dissolve at __
To prevent the latent fingerprints on a firearm from being disturbed, the weapon should be lifted in what manner?
By the edge of the trigger guard or by the checkered portion of the grip
After a gun is recovered from an underwater location, it should be:
a. Transported to the crime lab in a container with enough of the same water necessary to keep it submerged.
Discharged evidence bullets must be carefully handled to avoid damaging what?
Striation Markings
Tools and tool marks are often found at burglary scenes and can be useful evidence. Proper tool mark evidence collection by the field investigator would include which of the following?
Taking a photograph and cast of the marks if necessary
Two-dimensional imprints found at a crime scene can be lifted using what?
An electronic lifting device
How should shoe and tire marks impressed into soft earth be preserved and gathered as evidence
a. Photographing and then casting with dental stone

DEFINITION
Which would not be a class characteristic of a suspect's sneaker?
a. Wear marks
Which of the following is not expected to show any evidential marks or impressions?
Shotgun pellet
Which of the following makes the final determination about whether two bullets were fired by the same gun?
Trained firearms examiner
Dust imprints found at a crime scene can be lifted using what?
Eleectronic lifting Device
If an object bearing tool marks cannot be submitted to the crime lab intact, what should be taken of the tool mark?
cast
A wear pattern, cut, gouge, or other damage pattern can impart what type of characteristics to a shoe
individual
The distribution of gunpowder particles and other discharge residues around a bullet hole permits
a. Determination of the distance from which the gun was fired.
Which of the following procedures is not to be followed in collecting and packaging firearms evidence at the crime scene?
Marking an empty cartridge case on its base for identification
Which two elements would be detected on the hands of an individual who has recently fired a weapon
Antimony and barium
The presence of gunpowder residues on a garment whose color conceals the existence of the residue is best revealed by what method?
a. Infrared photography
Which of the following rifling methods is no longer in use?
Hook cutter method
Which of the following factors is least likely to be considered by the technician examining a tool mark
brand name of tool
Bullet wipe consists of a mixture of carbon, dirt, lubricant, primer residue, and lead
...
Which of the following is not a possible result of a laboratory examination of firearm
...
The comparison microscope is an indispensible tool of the
firearm examiner.
The Greiss test is used to determine the presence of
Nitrates___
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