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WVU FIS 201 Exam 3 questions and correct answers
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WVU FIS 201 Exam 3 questions and correct answers
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WVU FIS 201 Exam 3 questions andcorrect answer
Explain how skin produces fingerprints - ANS Friction ridges: Volar pads that start forming at
4 months and are consistent throughout life
Impressions: Spreads along ridge surface and sticks to substrate when pressed
Explain how exemplars are collected - ANS Voluntary submission or taken at booking by
livescan or rolled ink
Identify common locations to use the dusting method - ANS 1. Door frames and handles
2. Windows
3. Furniture
4. Appliances
Three types of prints - ANS 1. Patent
2. Latent
3. Impression/Plastic
Latent prints - ANS Must be developed with chemicals or light and cannot be seen with the
naked eye. Any substrate
Identify which development method should be used for a given situation - ANS Ninhydrin:
Porous substrates, forms "Ruhumann's Purple, works in blood
Cyanoacrylate Fuming: Nonporous substrates, binds to fats in water, forms protective layer over
ridges, works for fragile prints
Textured surfaces - ANS Dust first and lift with a squishy material
1. Mikrosil/Polyvinylsiloxane
2. Diff-Lift: thick squashy tape
Blood prints - ANS 1. Leucrystal violet: reacts with hemoglobin, works on porous and
nonporous substrates
2. Protein reactive/nonporous surfaces: Amido Black, Coomassie Blue, Hungarian Red
Identify the component of fingerprints that different development materials adhere to - ANS
Body oils and lipids
Steps of lifting a print - ANS 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
Identify the historical features associated with human identification - ANS
Three fingerprint patterns - ANS 1. Arch
2. Loop
3. Whorl
Arches - ANS Ridges enter on one side of print and exit on the other. No deltas are present
*tented arches: have a spike in the center*
Loops - ANS One or more ridges that enter and leave on the same side. One delta present
Whorls - ANS Spiral pattern of ridges and grooves. Two deltas present
Identify minutiae in an image of a fingerprint - ANS 1. Core
2. Ending ridge
3. Short ridge
4. Fork
5. Delta
6. Hook
7. Eye
8. Dot or Island
9. Crossover
10. Bridge
Explain the steps of ACE-V - ANS 1. Analysis: Collect data
2. Comparison: Test data
3. Evaluation: Conclusion
4. Verification: Second examiner performs the ACE (peer review)
Explain what AFIS is and how it works - ANS Automated Fingerprint Identification System
takes a print to be scanned and digitally encoded. It then undergoes high speed computer
processing to convert the image into a digital minutiae. AFIS can make thousands of fingerprint
pattern comparisons in seconds
Three basic tool marks - ANS 1. Compression
2. Sliding
3. Cutting
Compression marks - ANS Formed by pressure on a surface. The quality depends on the
substrate, the particle size, and the hardness of the tool
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