Forensics Exam Questions

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Who established the comparison microscope as the indispensible tool of modern firearms examiner?

Goddard

Forensic odontology refers to the study of:

Teeth

Who wrote the first treatise describing the application of science to the field of criminal investigation?

Gross

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:

Frye Standard

Who undertook the first definitive study of fingerprints as a method of personal identification?

Galton

If the crime scene includes a dead body, the photographer should:

Depict injuries and weapons at the scene

The most basic methods of crime scene recording include:

Photographs, note taking, and sketches

The victim's fingernail scraping would be correctly packed in:

Druggist fold

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

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

Livor mortis

The change in refractive index upon annealing tempered glass is ____ the change in refractive index upon annealing untempered glass.

Greater than

Pyrex glass is made with the addition of:

boron oxide

Eight inches is approximately _____ centimeters.

20

What are 3 synthetic fibers?

Acrylic, nylon, polyester

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

Paint binders can be chemically analyzed using:

IR Spectrophotometry and Pyrolysis GC

What are parts of composition of paint?

Pigment, binder, solvent

Medullae may be classified as being:

Interrupted, absent, continuous, fragmented

Which property imparts paint with its most distrinctive forensic characteristic

Color-layer sequence

By far the most prevaet 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 whter a hair sample originated from a 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

A low dose of alcohol will inhibit

Confidence, concentration, and judgment

Which is the percentage of evidence evaluated in the crime lab that is drug-related?

75%

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

Morphine or Heroin

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

Finding the origin of the fire.

Which is not a high explosive: dynamite, RDX, TNT, black powder?

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

What is NOT a way determine from a laboratory examination of evidence recovered from an arson?

the criminalist will not be able to reconstruct the ignition mechanism used by the arsonist.

An initiating explosive often used in detonators is:

PETN

The chemical ingredients of black powder are commonly:

Potassium nitrate, carbon, sulfur

Why is an arson or explosion crime scene difficult to investigate?

The extensive damages

What is dynamite?

A non-initiating high explosive

Search methods

1. spiral method
2. grid method
3. line method
4. quadrant method

What are the 5 types of drug ID tests?

1. color
2. microcrystalline
3. chromatography
4. spectophometry
5. Mass spec

Which color test turns purple in presence of heroin, morphine and opium and turns brown in presence of amethetamine and meth?

Marquis

Which color test turns violet blue in presence of barbs?

Dillie-Koppanvi

Which color test shows a purple color in chloroform of marijuana?

Duquenois-Levin

Which color test turns blue-purple when LSD is present?

Van-Urk

Which color test tests for cocaine (if turns solution blue, then add solution B, if it then turns pink, add solution C, if blue reappears then it's cocaine!)?

Scott Test

Which drug ID test IDs by color and morphology of crystal formed by substance when mixed with reagents?

Microcrystalline

Which drug ID test provides a tentative ID and accompanies color and microcrystalline tests?

Chromotagraphy

What is used with GC to ID drug and separate the drug?

Mass spec

What is the difference between UV and IR spectophometry?

UV is probable, IR is fingerprint of drug

Which chromatography do you need to remove vapor (head space) from air tight container and put in this chromotophraphy machine to separated into peaks?

GC

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