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50 terms

CRJ 234 - Harper - Test 3

Henry Ford Community College (HFCC) - Professor Harper - CRJ 234 - Test 3 (Final Exam) Questions
STUDY
PLAY
Pyrex glass
is made with the addition of boron oxide
Tempered glass is used in
the side/rear windows of autos manufactured in the US
Flotation is a method used by scientists to determine the ___ of a particle of glass
density
When a bullet penetrates a panel of glass, it leaves a crater-shaped hole that
is wider on the exit side
Which is a true statement about the fracturing of glass?
Radial cracks appear first, starting on the side opposite the destructive force
What is the logical first step in soil analysis?
comparison of dried soil sample for color and texture
The two most important physical properties of glass for forensic comparison are
refractive index and density
In reference to the diagrom below, what is the correct sequence of impacts?
A first
Stress marks on the edge of a radial crack near the point of impact are
perpendicular to the side on which the force was applied
The refractive index of a substance varies with
all of the above
(the color of the light passing through it)
(its temperature)
(the wavelength of the light passing through it)
Type AB blood contains
both A and B antibodies
In the US, the rarest blood type is
AB
To determine whether a bloodstain is of human or animal origin, the serologist will perform
a precipitin test
Paternity testing is done involving a women with type AB blood who has accused a man with type B blood of fathering her child who has tested AB. When can be determined in this case?
The male could have fathered the child
Luminol can be used at crime scenes to
detect traces of blood without compromising potential DNA typing
Buccal cells are obtained from
the mouth and inside of the cheek
The presence of absence of how many antigens determines an individual's blood type in the A-B-O system?
2
An individual who is type O has
neither A nor B antibodies
Antibodies are found
in the blood serum
PSA (p30) is a
protein unique to seminal plasma
If blood is found to have both A and B antigens is typed as
AB
Which of the following statements is FALSE?
Spermatozoa can generally be found in the vagina of a living female after 3 days
A stain can tentatively be identified as blood by
all of the above
(benzidine test)
(Bluestar test)
(phenolphthalein test)
(luminol test)
___ transports oxygen from the lungs to the body tissues and carry carbon dioxide back to the lungs
Red blood cells
The D antigen is also known as the ___ antigen
Rh
The clumping together of red blood cells by the action of an antibody is known as
agglutination
The pointed end of a bloodstain always faces
in its direction of travel
A blood droplet deposited at an angle of impact of about 90° (directly vertical to the surface) will
be approximately circular in shape
The most common type of bloodstain pattern found at a crime scene is
impact spatter
The deposition of backward spatter produced by a gunshot wound is determined by
all of the above
(size of the wound created)
(distance between the victim and the muzzle)
(location of the surface of deposition)
(location of the injury)
If a murder victim's blood is found in the muzzle of a firearm
it cane be concluded that the firearm was present during injury to the victim
Widely spaced bloody shoeprints with satellite spatter between the shoeprints were likely deposited by an individual who was
running
A trail pattern leading away from the victim at a stabbing scene was most likely created by
blood dripping from the murder weapon
Crime scene reconstruction have the best chance of accuracy if
investigators use proper documentation and collection methods fro all types of evidence
Crime scene reconstruction requires the piece together of
all of the above
(story told by evidence recovered at the crime scene)
(accounts given by witnesses and suspects)
(input from the medical examiner)
(laboratory results obtained by the criminalist working on the case)
Generally, bloodstain diameter ___ as height increases
increases
The ___ of a bloodstain pattern in a three-dimensional space illustrates the position of the victim or suspect when the stain-producing event took place.
area of origin
By counting and pairing the patterns of a(n) ___ pattern, an investigator can estimate the minimum number of blows inflicted upon a victim
cast-off
The reason grooves are rifled into the bore of a gun is so that a
bullet will be made to spin and hence have a true and accurate course on leaving the barrel
The barrel of a shotgun
is smooth without the grooves and lands found in rifles
Generally, the guage of a shotgun is ___ to the diameter of its barrel
directly related
Distinctive markings of shells and cartridges can be made by the
all of the above
(breech lock)
(extractor and ejector mech)
(magazine
(firing pin)
NIBIN is/are:
database for firearm evidence
Generally speaking, the amount of gunpowder particles found around a bullet hole is ___ to the distance from which the weapon was fired
directly related
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
To prevent the disturbance of latent fingerprints on a firearm, the weapon should be lifted by
the edge of the trigger guard or by the checkered portion of the grip
When a gun is recovered from an underwater location, it should be
transported to the crime lab in a contained with enough of the same water necessary to keep it submerged
Discharged evidence bullets must be carefully handled to avoid damage to the
striation markings
The distribution of gunpowder particles and other discharge residues around a bullet hole permits
determination of the distance from which the gun was fired
Which of the following statements is true?
The comparison microscope is an indispensable tool of the firearm examiner