Forensic Science Segment Two Midterm

To take a sample of ink on a document, a forensic scientist may take a needle with a blunt end and punch it through the document on an ink line.
True
Unlike some of the other areas of forensic science, there are often no specific tests that can be used to definitively prove that something has been forged or that it is not authentic.
True
Obliteration almost always signals fraudulent activity.
False
Toxicology is the study of what?
Substances that have an adverse effect on living organisms
What did Mathieu Orfila do related to forensic toxicology?
Published one of the first written works dedicated to the topic of poisons
Orfila was able to identify what poison in human tissue?
Arsenic
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The philosopher Socrates was executed using which poison?
Hemlock
What type of sample can give information on how long someone has been exposed to a poison?
Hair
Women’s bane or wolfsbane is another term for which poison?
Aconite
Who worshipped a goddess of poison?
Sumerians
What is used in a Reinsch test?
A copper strip
What did Hermann Boerhaave suggest?
That poisons could be detected through chemical means
Which poison can be identified by a color test?
Cyanide
Pigment does what to paint?
Gives it color
What are substances that provide support or structure for the pigment in paint?
Binders
Which microscope has the highest potential magnification?
Scanning electron microscope
How many layers of paint are there on the typical manufactured vehicle?
Four
What is PDQ?
A paint database
Polymers contain how many atoms?
Thousands
When a polarized white light is sent through a synthetic fiber, how many perpendicular rays are created?
Two
A microspectrophotometer measures which of the following?
Light absorption
When paint is collected from a car suspected of being involved in a hit and run, where would the known paint sample be taken from to compare to paint evidence?
A spot close to the point of impact, but in a place that has not been damaged
Gas chromatography can be useful in determining what about paint?
Its chemical composition
The Van Urk-Salkowski test is used when which drug is suspected?
LSD
Which drug comes from the poppy plant?
Opium
The Duquenois-Levine Test is used when which drug is suspected?
Marijuana
Which type of test helps forensic scientists to narrow down the possibilities of what drug a substance may be?
Screening test
Spectrophotometry uses what to help identify drugs?
Light
Stimulants are also called what?
Uppers
Microcrystalline tests involve exposing samples of a substance to a reagent and examining what about the crystals that form?
Morphology
Ecstasy is one example of which of the following?
Club drugs
In the Marquis Color Test, the solution will turn what color in the presence of opiates?
Purple
Cocaine is an example of which of the following?
Stimulants
The most widely found natural fiber is cotton.
True
A scanning electron microscope works by shooting a beam of electrons at the item and recording the electron emissions that occur.
True
Wool is an example of a synthetic fiber.
False
Who maintains a database of thin-layer chromatography results for different pens, ink, and toners?
The US Secret Service and the IRS
When presented with a handwritten questioned document, what is one of the first things that a document examiner will look at?
Writing style
Forensic scientists who study possible forgeries and questioned documents are often called what?
Document examiners
What might law enforcement do to reduce attempts at deception when gaining a handwriting sample?
Have the material contain some of the same words and phrases as the questioned document.
Which of the following might be used to help enhance the information on a receipt?
Digitizing
What is the crossing out or overwriting of original material to make it unreadable?
Obliteration
Our writing tends to be more similar to others when we are in which stage of life?
Younger
Which of the following is a clue that something has been erased on a document?
The fibers of the paper are disturbed when looked at under a microscope
What element can influence our handwriting?
The way we hold a pencil, The pressure we use to write, The speed we write with
The symptoms of a poisoning make it very easy for forensic scientists to identify which poison was used.
False
Forensic toxicology involves not only the area of toxicology, but also the use of areas such as analytic chemistry and pharmacology.
True
Barbiturates are a form of depressants.
True
LSD was first produced from ergot, a fungus that is found on some plants and grasses.
True
When examining indentations, document examiners may apply what to help reveal the indentations?
An electrostatic charge