50 terms

forensic exam questions

STUDY
PLAY
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