Quiz 8 in Criminalistics.
16. The first and most popular step in the examination of standard/reference and crime scene fibers is a a. test for chemical composition b. microscopic comparison for color and diameter c. chromatographic seperation of dye constituents d. microspectrophotometer reading on dye composition 17. in addition to doing morphological and chemical composition tests another method that forensic scientists may use to compare synthetic fibers is to a. run tests that determine the origin of the fibers b. conduct a mitrochondrial DNA profile analysis c. measure the two refractive indices under a polarizing microscope d. reference the FBI's statistical database for the manufacturers of all the same class of fibers including probability formulas 18. The assertion that fiber evidence can be associated with virtually any type of crime leads to all of the following crime scene precautions except a. bagging articles separately to avoid cross contamination of evidence
b. taking adhesive tape lifts the body areas exposed to a wrapped blanket or carpet c. pinpointing crime scene areas or items suspected of containing transferred fiber evidence d. collecting any and all crime scene items that even remotely may have encountered fiber transfer
19. Pyrolysis gas chromatography has proven to be a valuable technique for comparing auto paint formulations for all of the following reasons except a. paint chips as small as 20 micrograms are sufficient for analysis b. it reveals the layer structure of paint in sufficient complexity to allow individualization c. the pyrogram is sufficiently detailed to reflect the chemical makeup of the paint binder d. in conjunction with color and layer comparisons the evidence forges a strong link between the suspect's car and crime scene 20. when investigating a break in, the scene investigator who is collecting evidence should follow all the following procedures except a. collecting paint from the impressions left by tools used to gain entry b. carefully wiping the scraping tool before using it to collect each paint sample c. packaging the break in tools without attempting to remove any paint from them d. obtaining all layers of paint from surfaces suspected of being in contact with the break in tool
m number 8. the rest of the questions:
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