forensic exam questions

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Who established the comparison microscope as the indispensable tool of the modern firearms examiner

goddard

Forensic odontology refers to the study of:

teeth

Rigor mortis refers to the:

stiffness of death

The exchange of evidence principle was:

locard

The concept of general acceptance of scientific evidence relates to the:

frye standard

The case Frye v. US deals with the legal issue of:

General acceptance of scientific principals

The process by which the body temperature cools after death is known as:

algor mortis

The most basic methods of crime scene recording do NOT include:

narrate videotape

The first officer arriving at a crime scene, after providing or obtaining medical assistance for the injured and effecting an arrest of suspects (if possible), should immediately:

secure the scene

Charred Debris from an arson scene should be:

Packaged in air tight glass jar

Evidence of tampering with the position of a body after death can be obtained by evaluating the:

livor mortis

Evidence with individual characteristics can lead to a determination of common origin (single source). Which type of evidence cannot yield such results:

single-layer paint

All of the following items may be placed in an airtight contained except:

blood stained clothing

If the lab can piece broken glass from a window or headlight together then the evidence has _______ characteristics.

class

Physical evidence that can be used to aid in a crime scene reconstruction includes:

all of the above (blood spatters, gunshot residues, shoeprints)

The change in refractive index upon annealing tempered glass is ________ the change in refractive index:

greater than

Pyrex glass:

is made with the addition of boron oxide

Eight inches is approximately_______ centimeters:

20

One inch is equivalent to how many centimeters:

2.54

The fracture pattern of glass usually has:

radial and concentric lines

The reagent used for the field test of heroin is:

marquis

The ability to make a positive identification of a drug using UV spectrophotometry is ___ the ability to make a positive identification using IR spectrophotometry:

less than

The Marquis reagent was used on drug evidence and it turned purple. The drug being tested could be:

heroin

Which percentage of evidence in the crime lab is drug related:

75%

A low dose of alcohol will NOT inhibit:

memory

Paint binders can be chemically analyzed using:

IR spectrophotometry and Prolysis GC

Which is not a synthetic fiber:

rayon

Which of the following is not a layer of the hair shaft:

follicle

The central canal running through many hairs is known as the:

medulla

Which is not part of the composition of paint:

adhesive

Medullae may be classified as being:

interrupted or absent, continuous, fragmented

Which property imparts paint with its most distinctive forensic characteristic:

color-layer sequence

By far the most prevalent plant fiber is:

cotton

Which race is most likely to have head hair with continuous medullae:

Mongolian

In what stage can a hair most readily be removed from the scalp:

telogenic

In determining a hair sample originated from male or female, the MOST important consideration is:

the result of DNA analysis from the root structure

Pigment granules that impart hair with color are found in the :

cortex

Before the 20th century, all fibers were:

natural

When investigators search a fire scene, the first focus must be on:

finding the origin of the fire

Which is not a high explosive:

black powder

Most explosives can be recovered from debris for future study by being rinsed with:

acetone

Which instrumentation is considered the most sensitive and reliable for detecting and characterizing flammable residues:

GC

Hydrocarbon accelerants can be detected by:

trained dogs and a portable detector

The minimum temperature at which fuel vapor will ignite is known as:

the ignition temperature

Which of the following is not possible to determine from a laboratory examination of evidence recovered from an arson:

examination of the debris may reveal the brand name of gasoline used to start the fire

An initiating explosive often used in detonators is:

PETN

The chemical ingredients of black powder are commonly:

potassium nitrate, carbon, sulfur

Which of the following statements is false:

dynamite is an initiating high explosive

Discuss the proper collection of evidence at the origin of a fire that is suspected of being initiated by gasoline:

**2-3 quarts

Why is arson or explosive crime scene difficult to investigation:

because of hazardous chemicals and flying debris

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