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FIS 201 WVU Final exam study test guide questions and answers
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FIS 201 WVU Final exam study test guide questions and answers
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FIS 201 WVU Final exam study test guidequestions and answers
Marquis Reagent - ANS Turns purple with Heroin and Morphine, orange/brown with
amphetamines
Dillie-Koppanyi - ANS Violet blue with Barbiturates
Duquenosis-Levine - ANS Purple with marijuana when chloroform is added
Van Urk - ANS Blue/purple with LSD (not appropriate for field tests)
Scott Test - ANS Color test for Cocaine. Adding cobalt thiocyanate turns solution blue, add
hydrochloric acid and blue turns to pink, then add chloroform and it turns back to blue for
positive result.
Chromatography - ANS Any of several analytical techniques for separating organic mixtures
into their components by attraction to their stationary phase by a mobile phase
Stationary phase - ANS substance that stays fixed
Mobile phase - ANS solvent used to separate the mixture
Thin Layer Chrom. (TLC) - ANS Uses a solid stationary phase and a mobile liquid phase to
separate inks or dyes. Very rapid and sensitive.
Gas Chrom. (GC) - ANS Separates mixtures based on their distribution between a stationary
liquid phase and a moving gas phase. As the gas flows through the columns it carries the
components of the mixture. (Cannot produce specific identification)
Spectrophotometry - ANS Identifies a substance by its selective absorption to different
wavelengths of light (non destructive)
Mass Spectro. (MS) - ANS Material from the GC enters MS in a chamber where a beam of
electrons collide with the molecules. MS provides the specifics that GC doesn't.
Scanning Electron Microscope (SEM) - ANS Type of microscope that produces images of a
sample by scanning it with a focused beam of electrons.
Comparison Microscope - ANS Used to analyze side by side specimen up close
, ELISA test (immunoassay) - ANS Test that detects and measures antibodies in a persons
blood to determine if you have antibodies related to certain infectious conditions or diseases.
Short Tandem Repeats (STR) - ANS DNA regions with short repeated strands that contain
polymerase chain reactions (PCR) which help in identification of a person.
Questioned Document - ANS Any document whose authenticity or origin is suspect either as
a whole or a part.
Albert S. Osborn - ANS Teacher of penmanship, encouraged courts to accept questioned
documents as evidence, founded ASQDE
Professional groups for questioned documents - ANS ASQDE, NADE, ABFDE
Questioned document Examiner tasks - ANS Establish forgery, Identify or eliminate
handwriting or source of typewriting
Paper physical characteristics - ANS Watermarks, Inclusions, Color, Size (Use ALS or
Spectrophotometer)
Paper Chemicals - ANS Cellulose fibers, Bleaches/dyes, fillers or coatings (Use GCMS, color
by spectrogram)
Intentional Machine Marks - ANS Watermarks, TTI, Microprinting, safety features
Components of a questioned document - ANS Substrate, messaging compound, marking
mechanism (pen, pencil)
Light examination - ANS Uses filters to look beyond human vision, can locate additions or
obliteration (VSC 6000)
Investigation of fires - ANS Firefighters: determine cause and origin
Police: investigate non accidental
Chromatograph for fires - ANS Time of peak emergence (gas) or distance of travel (liquid)
Spectroscope - ANS Shows ion charge/mass ratio for component ions, finds the identity of
chemicals used
Flash point - ANS Temp. at which vapors will burn given a spark
Autoignition temp - ANS Temp. at which spontaneous burning occurs
Triangle of fire - ANS Air fuels the fire and causes it to rise and spread outward
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