The barrel of a shotgun:
Is indistinguishable from that of a rifle
Is smooth without the grooves and lands found in rifles
Is generally shorter than that of a rifle
Is wider at the end to concentrate shot
The reason grooves are rifled into the bore of a gun is so that a:
Bullet will be made to spin and have a true and accurate course on leaving the barrel
Bullet moving though will have unique striations
Manufacturer can put its unique mark on its product
Bullet will be reduced in size before it exits the gun
The comparison of two bullets is possible with the comparison microscope. Such a study is made difficult by the fact that:
Lands and grooves are subject to wear and tear and hence striations markings are susceptible to continuing change.
Often evidence bullets are distorted on impact and only small areas are found with intact markings.
The presence of grit and rust can to some degree alter the markings on bullets fired through the same barrel.
All of the above
Generally, the gauge of a shotgun is _______ to the diameter of its barrel
None of the above
Distinctive markings of shells and cartridges can be made by the:
Extractor and ejector mechanism
Breech face mark
Trade group of firearms manufacturers
Safety education courses for firearm use
A database for firearm evidence
Lists of licenses gun dealers
Generally speaking, the amount of gun powder particles found around a bullet hole is _____ to the distance from which the weapon was fired.
Gun powder residue patterns can be detected by:
The Greiss Test
Both a and b
Neither a nor b
Chokes are sometimes found on shotguns where they function to constrict the end of the barrel. The speed and distance traveled by pellets fired from a narrow choke is _____ the speed and distance traveled by pellets fired from a shotgun with a wide choke.
The same as
The “dermal nitrate test” has fallen into disfavor because of its lack of specificity. Which of the following common materials does NOT give a misleading positive reaction to this test?
The likelihood of detecting GSR on swabs taken from living subjects more than six hours after a firing has occurred is _____ the likelihood of detecting GSR within two hours of a firing.
Which technique of detecting GSR holds the most promise for the immediate future?
SEM primer residue detection
Neutrn activation analysis
Dermal nitrate test
When an etching agent is applied to a metal surface in order to restore a removed serial number the stamped area will dissolve at _____ as the unstamped area.
A greater rate
The same rate
A slower rate
To prevent the disturbance of latent fingerprints on a firearm, the weapon should be lifted by:
Inserting a pencil into the barrel
Using disposable forceps
The outside of the barrel or the trigger
The edge of the trigger guard or by the checkered portions of the grip
When a gun is recovered from an underwater location, it should be:
Transported to the crime lab in a container with enough of the same water necessary to keep it submerged.
Placed in an air-tight plastic bad
Cleaned and dried
Submitted to the crime lab in a paper bad
Discharged evidence bullets must be carefully handled to avoid damage to the:
Tools and tool marks are often found at burglary scenes and can be useful evidence. Proper evidence collection by the field investigator would include:
Reporting whether a tool found at the crime scene fit into the tool marks
Making test marks with the suspected tool onto a soft metal surface at the crime scene
Taking a photograph and cast of the marks if necessary
Packing of tool and tool mark evidence together so that the crime lab personnel know they are thought to be a matched set.
Two-dimensional imprints found at a crime scene can be lifted using:
A silicone casting medium
A scanning electron lifter
An electrostatic lifting device
Shoe and tire marks impressed into soft Earth can be best preserved by:
Photographing and casting with dental stone
Photographing and then use of the electrostatic lifting technique.
Casting with dental stone and then attempting the electrostatic lift technique.
Which is NOT a class characteristic of a suspect’s sneaker?
Which of the following is not expected to show any evidential marks or impressions?
A fired bullet
A cartridge casing fired from a handgun
A cartridge casting fired from a shotgun
A shotgun pellet
Which of the following procedures is not to be followed in collecting and packaging firearms evidence at the crime scene?
Marking a fired bullet on its base for identification
Avoiding inserting a stick or pencil into the barrel of a weapon
Marking an empty cartridge case on its base for identification
Unloading a weapon before shipping it to the crime laboratory
Two elements detected on the hands of an individual who has recently fired a weapon are:
Zinc and copper
Antimony and barium
Barium and nitrates
Antimony and iron
Which of the following factors is least likely to be considered by the examining tool mark technician?
The direction of the tool movement as it passes over the surface
The side or portion of the tool making the impression
The brand name of the tool
The angle at which the tool was held
Which of the following results is not possible from a laboratory examination of firearm evidence?
Determining that two or more cartridge cases were fired from the same weapon
Determining how far from the victim the weapon was held
Restoring serial numbers ground off the gun
Identifying a bullet as having been combined with a particular shell prior to being discharged
Which of the following statements is true?
A bullet can be individualized to a weapon by the number and twist of its lands and grooves.
The comparison microscope is an indispensable tool of the firearm examiner.
The diameter of the bore of a rifled firearm is its gauge.
Carbonaceous smoke or soot deposited around a bullet hole is normally indicative of a discharge 12 to 18 feet or less from the target.
The presence of gunpowder residues on a garment whose color conceals the existence of the residue is best revealed by:
Which of the following rifling methods is no longer in use?
The button method
The hook cutter method
The mandrel method
The broach cutter method
Which of the following makes the final determination about whether or not two bullets were fired by the same gun?
A comparison microscope
A trained firearms examiner
The automated shoe print identification system is known as:
Dust imprints found at a crime scene can be lifted using:
. A technique applicable for determining whether or not an individual has ¬recently fired a weapon is:
Neutron activation analysis
Atomic absorption analysis
The scanning electron microscope
Objects bearing tool marks should either be submitted intact to the crime lab or a _____ should be taken of the tool mark.
Black and white photograph
A wear pattern, cut, gouge, or other damage pattern can impart _____ characteristics to a shoe.
An imprint may be lifted from a surface at a crime scene using:
Plaster of paris
Imido black dye
The distribution of gunpowder particles and other discharge residues around a bullet hole permits:
Determination of the distance from which the gun was fired.
Determination of the kind of firearm used.
Estimation of the angle of bullet impact.
Estimation of the height of the shooter.