Exam (elaborations)
FIS 201 WVU Final (Mohr)
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FIS 201 WVU Final (Mohr)
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FIS 201 WVU Final (Mohr)Marquis Reagent - CORRECT ANSWER-Turns purple with Heroin and Morphine,
orange/brown with amphetamines
Dillie-Koppanyi - CORRECT ANSWER-Violet blue with Barbiturates
Duquenosis-Levine - CORRECT ANSWER-Purple with marijuana when
chloroform is added
Van Urk - CORRECT ANSWER-Blue/purple with LSD (not appropriate for field
tests)
Scott Test - CORRECT ANSWER-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 - CORRECT ANSWER-Any of several analytical techniques for
separating organic mixtures into their components by attraction to their stationary
phase by a mobile phase
Stationary phase - CORRECT ANSWER-substance that stays fixed
Mobile phase - CORRECT ANSWER-solvent used to separate the mixture
Thin Layer Chrom. (TLC) - CORRECT ANSWER-Uses a solid stationary phase
and a mobile liquid phase to separate inks or dyes. Very rapid and sensitive.
Gas Chrom. (GC) - CORRECT ANSWER-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 - CORRECT ANSWER-Identifies a substance by its selective
absorption to different wavelengths of light (non destructive)
, Mass Spectro. (MS) - CORRECT ANSWER-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) - CORRECT ANSWER-Type of
microscope that produces images of a sample by scanning it with a focused
beam of electrons.
Comparison Microscope - CORRECT ANSWER-Used to analyze side by side
specimen up close
ELISA test (immunoassay) - CORRECT ANSWER-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) - CORRECT ANSWER-DNA regions with short
repeated strands that contain polymerase chain reactions (PCR) which help in
identification of a person.
Questioned Document - CORRECT ANSWER-Any document whose authenticity
or origin is suspect either as a whole or a part.
Albert S. Osborn - CORRECT ANSWER-Teacher of penmanship, encouraged
courts to accept questioned documents as evidence, founded ASQDE
Professional groups for questioned documents - CORRECT ANSWER-ASQDE,
NADE, ABFDE
Questioned document Examiner tasks - CORRECT ANSWER-Establish forgery,
Identify or eliminate handwriting or source of typewriting
Paper physical characteristics - CORRECT ANSWER-Watermarks, Inclusions,
Color, Size (Use ALS or Spectrophotometer)
Paper Chemicals - CORRECT ANSWER-Cellulose fibers, Bleaches/dyes, fillers
or coatings (Use GCMS, color by spectrogram)
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