Ch. 15: Firearms, Toolmarks, and Impressions

The cartridge found at a scene may provide both class and individual evidence

True

IBIS is maintained by the ATF

True

Bullets come in different shapes

True

Bitemarks cannot be the sole source of evidence since it is reasonably possible to find two sets that closely match

False

Bullet size is expressed in meters

False

There are databases for tire impressions

True

Cannelures on a bullet result from the bullet being fired from a gun

False

The density of combustion particles increases with the distance from the bullet hole

False

Lands and grooves are individual characteristics

False

The database for bullets is contained within CODIS

False

Bullets and their cartridges are named by:

caliber and length

Which of the following leave marks on the cartridge?

magazine, chamber, extractor, ejector

A color test for the presence of nitrite in gunpowder residue is called

Greiss

There is more than one category of tool marks. These tool marks include:

cutting, indentation, and abrasion marks

Tire mark types include:

skid marks, yaw marks, tire scrubs

As a bullet leaves the muzzle of a weapon, it carries along with it some of the unburned particles as well as combustion products primarily coming from:

nitrates

A tire's tread surface is divided into:

ridges (elevated regions) and grooves (indentations)

Bitemarks were the prime evidence against which of the following serial killers

Ted Bundy

A color test for the presence of lead in gunshot residue is called

sodium rhodizonate test

What technique is being used to match residue left on a road surface from a sudden braking or a spinning wheel to the tire manufacturer?

pyrolysis gas chromatography and mass spectrometer

Which of the following shows an individual characteristic of shoe prints

damage to the sole

A revolver would be considered a

handgun

Which of the following is NOT a class characteristic of tire impressions?

a tear in the tread

A single shot or bullet in a shotgun shell is called a:

slug

The interior diameter of a shot gun barrel as determined by the number of lead balls of a size exactly fitting the barrel that are required to make one pound

the gauge

Parallel sets of scratches on a bullet caused by unique markings in the bore of a rifled weapon

striae

The standard method documenting impression evidence is

photography

A container that holds cartridges under spring pressure to be fed into the gun's chamber

magazine

The interior diameter of a gun barrel

the bore

Modern ammunition consists of 4 components which are:

cartridge case, primer, propellant, and projectile

The diameter of the bore of a firearm or the cartridge that is fired is called the (a)

caliber

The portion of the gun that contains the firing mechanism

the breech

The distance from the centerline of the right tire to the centerline of the left tire

track width

The distance from the center of the front wheel hub to the center of the rear wheel

wheelbase

Give an example of how a tool could produce individual evidence.

If the tool had damage to it, like dents, scratches, chipped

Describe a way in which a cartridge could be individual evidence.

The way it was damaged after being fired. Its lands and grooves, the head stamp, the twist direction, etc.

Describe a way in which a cartridge could be class evidence.

The manufacturer, the metal its made from