Exam (elaborations)
WVU FIS 201 Exam 3.
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Exam of 9 pages for the course FIS 201 at FIS 201 (WVU FIS 201 Exam 3.)
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WVU FIS 201 Exam 3anatomy of fingerprints - CORRECT ANSWER-friction ridges
when do volar pads start forming? - CORRECT ANSWER-4 months
what is unique about volar pads? - CORRECT ANSWER-consistent throughout
life
3 steps of creating an impression - CORRECT ANSWER-- sebrum & sweat
- spreads along ridge surface
- sticks to substrate when pressed
foreign materials that could potentially have fingerprints - CORRECT ANSWER--
blood, ink, motor oil, pizza grease
3 types of prints - CORRECT ANSWER-patent, latent, impression/plastic
patent - CORRECT ANSWER-see without additional assistance
latent - CORRECT ANSWER-hidden fingerprint
impression/plastic - CORRECT ANSWER-occur when soft surface is deformed
2 ways to collect known prints - CORRECT ANSWER-- voluntary submission
- prints are taken at booking (live scan, rolled ink)
what print is naked to the eye? - CORRECT ANSWER-latent print
what print must be developed with chemicals or light? - CORRECT
ANSWER-latent print
porous - CORRECT ANSWER-immediately absorb water
nonporous - CORRECT ANSWER-do not absorb water
semiporous substrates - CORRECT ANSWER-can absorb water over time
, what substrates should dusting be used on? - CORRECT ANSWER-nonporous
& semiporous
how does dusting work? - CORRECT ANSWER-powder adheres to fats & oils
how to dust evidence? - CORRECT ANSWER-gently apply with fiberglass or
magnetic brush
locations to look for fingerprints - CORRECT ANSWER-door frames & handles,
windows, furniture, appliances
how to lift a print - CORRECT ANSWER-1. photograph
2. press the lifting tape across the print
3. smooth the tape flat
4. lift off the print
5. press it over the lift card
what substrates should ninhydrin be used on? - CORRECT ANSWER-porous
substrates
what does ninhydrin react to? - CORRECT ANSWER-reacts with amino acids in
print to form Ruhemann's Purple
what does ninhydrin also work with? - CORRECT ANSWER-faint prints in blood
what substrate is cyanoacrylate fuming used on? - CORRECT
ANSWER-nonporous
how does cyanoacrylate fuming work? - CORRECT ANSWER-binds to fats in the
presence of water and forms a protective layer over ridges
what is cyanoacrylate fuming useful for? - CORRECT ANSWER-degraded or
fragile prints
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