Forensics exam review
Which is the percentage of evidence evaluated in a crime lab that is drug related?
75
All of the following items may be placed in an airtight container except:
Charred debris recovered from a fire Bloodstained clothing Glass Hairs and fibers
Pigment granules that impart hair with color are found in the
Cortex Cuticle Medulla Both a & b
Which instrumentation is considered the most sensitive and reliable for detecting and characterizing flammable residues?
GC
An initiating explosive often use din detonators is:
PETN
Stress marks on the edge of a radial crack near the point of impact are:
Parallel to the side on which the force was applied
The chemical ingredients of black powder are commonly:
Potassium nitrate, carbon, sulfur
Most explosives can be recovered from debris for future study by being rinsed with:
acetone
Which of the following is NOT part of the composition of paint?
adhesive
The process by which the body temp cools after death is known as:
algor mortis
Hit and run accidents may result in which type(s) of evidence?
all
Medullae may be classified as being:
all
the elements that comprise the inorganic pigments of paint can be identified by:
all
which is not a high explosive?
black powder
Hydrocarbon accelerants can be detected by:
both a & b
A cast of a hair surface can be made using:
both b & c
paint binders can be chemically analyzed using:
both b & c
Which property imparts paint with its most distinctive forensic characteristic?
color-layer sequence
A fiber whose microscopic appearance includes being ribbon like in shape with twists at irregular intervals is:
cotton
A technique frequently used to compare soils is:
density-gradient tube
The chemical ingredients of black powder are commonly:
dynamite is an initiating high explosive
The marquis reagent was used on drug evidence and it turned purple. The drug being tested could be:
either a or b
Which of the following is not a layer of the hair shaft?
follicle
mohair and cashmere are hairs from:
goats
Who established the comparison microscope as the indispensable tool of the modern firearms examiner?
goddard
The change in refractive index upon annealing tempered glass is ____ the change in refractive index upon annealing untempered glass:
greater than
The likelihood of finding class physical evidence is ____ the likelihood of finding physical evidence with individual characteristics:
greater than
A police officer performs a field test on a white powder, obtaining a purple color. The most likely drug present is:
heroin
pyrex glass
is made with the addition of boron oxide
The ability to make a positive ID of a drug using UV spec is ____ the ability to make a positive ID using IR spec
less than
Evidence of tampering with the position of a body after death can be obtained by evaluating the:
livor mortis
The exchange of evidence principle was?
locard
The reagent used for the field test of heroin is:
marquis
the central canal running through many hairs is known as the:
medulla
Before the 20th century, all fibers were
natural
The fracture patter of glass usually has:
radial and concentric lines
Which is NOT a synthetic fiber?
rayon
In determining whether a hair sample originated from a male or female, the MOST important consideration is:
result of DNA analysis from root structure
Forensic odontology refers to the study of
teeth
In what stage can a hair most readily be removed from the scalp?
telogenic
The manner of collecting and preserving physical evidence at a crime scene is determined by:
the nature of the evidence
Cellulose is the basic component of:
wood