Criminalistics EXAM 2 Question and
answers verified to pass
List & describe the four different techniques that are used to collect materials
evidence. (PMTV) - correct answer Picking: is using fine-point
forceps/tweezers to collect evidence requires good lighting.
Mechanical dislocation is less specific but more efficient. It is scraping and
shaking over a clean piece of paper that should be done in a lab environment.
The collected materials are then examined using a microscope.
Tape lifting is part of the evidence surface being covered with a piece of sticky
tape. The tape is then removed, placed on clear backing, and later examined
using a microscope. It is the most time-consuming technique but also the
most efficient.
Vacuuming uses a vacuum with a special container with filter paper attached.
Vacuuming is the least preferred method & should only be used as a last
resort.
List and describe the four sampling methods which can be used for dried
bloodstains. CaSSiE - correct answer Cutting is for stains on objects that are
difficult to submit to the lab. The cut portion should include unstained areas
around the bloodstain.
Swabbing is when a stain is transferred to a swab (Q-tip) that has been
moistened with sterile water or saline. Scraping is when a sharp instrument is
used to scrape the stain off of a surface and onto clean paper.
Elution is using a small amount of saline or distilled water to dissolve the dried
stain
List eight different items of evidence that may be present at a crime scene that
have the potential for DNA analysis. - correct answer Eight different items of
evidence that may be present at a crime scene that have the potential for
DNA analysis are blood, semen, saliva, urine/fecal material, teeth, hair, and
fingernails/toenails.
answers verified to pass
List & describe the four different techniques that are used to collect materials
evidence. (PMTV) - correct answer Picking: is using fine-point
forceps/tweezers to collect evidence requires good lighting.
Mechanical dislocation is less specific but more efficient. It is scraping and
shaking over a clean piece of paper that should be done in a lab environment.
The collected materials are then examined using a microscope.
Tape lifting is part of the evidence surface being covered with a piece of sticky
tape. The tape is then removed, placed on clear backing, and later examined
using a microscope. It is the most time-consuming technique but also the
most efficient.
Vacuuming uses a vacuum with a special container with filter paper attached.
Vacuuming is the least preferred method & should only be used as a last
resort.
List and describe the four sampling methods which can be used for dried
bloodstains. CaSSiE - correct answer Cutting is for stains on objects that are
difficult to submit to the lab. The cut portion should include unstained areas
around the bloodstain.
Swabbing is when a stain is transferred to a swab (Q-tip) that has been
moistened with sterile water or saline. Scraping is when a sharp instrument is
used to scrape the stain off of a surface and onto clean paper.
Elution is using a small amount of saline or distilled water to dissolve the dried
stain
List eight different items of evidence that may be present at a crime scene that
have the potential for DNA analysis. - correct answer Eight different items of
evidence that may be present at a crime scene that have the potential for
DNA analysis are blood, semen, saliva, urine/fecal material, teeth, hair, and
fingernails/toenails.
