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