Fingerprint Content Flashcards
made by fingers touching a surface after the ridges have been in contact with a colored material (ex: blood, paint, dirt, ink)
visible prints
ridge impressions left on a soft material (ex: putty, wax, soap, dust)
Plastic Prints/ Impressions
invisible prints left behind by clear oils on the fingertips
latent prints
can locate prints on most non-absorbent surfaces without the aid of a chemical or powders
RUVIS (reflected ultraviolet imaging systems)
can be used to make latent prints visible
fingerprint powders
… and … powders are adequate for most latent print work
black and gray
3 methods for collecting fingerprints
- Iodine Fuming
- Ninhydrin Chemical Reaction
- Super glue Fuming
prints remain … during an individuals lifetime with the exception of …
unchanged; injuries
careful study of ridge characteristics
minutiae
T/F: no two people have the same fingerprint
True
the center of a loop or whorl
core
a triangular region near a loop
delta
- counting from the core to the edge of the delta
- distinguishes one fingerprint from another
ridge count
3 types of whorls
- central pocket loop whorl
- double loop whorl
- accidental whorl
2 types of arches
- plain arch
- tented arch
What are fingerprints a result of?
oil and secration
Where are the soils and secration that are transferred to a surface by the what of ones finger?
ridges
fingerprints are considered to be a form of … evidence
class
You need at least a … from a crime scene in order for it to be used as evidence
partial print
… dusted in order to identify ridge patterns
Plastic/Impression
most common form of fingerprints?
loops
Program used to house fingerprints and make it possible to obtain a match of a fingerprint
AFIS (automated fingerprint identification system)
What does a fingerprint examiner look for between a suspect print and a crime scene print?
similar minute patterns
fingerprint extracting method that uses chemical reactions to make prints visible
superglue Fuming
When are fingerprints formed?
during pregnancy before birth
Why is the use of fingerprint identifications not perfect?
the current technology and examiners
T/F: A fingerprint pattern will remain unchanged for the life of an individual; however the print itself may change due to scars or skin disease
True
3 specific classes for all fingerprints?
- loops
- whorls
- arches
simplest type of fingerprints that are formed by ridges
arches
must have one delta and one or more ridge that enter and leave on the same side
loops
have at least one ridge that makes a complete circuit, and also have at least two deltas
whorls
65%
loop
30%
whorl
5%
arch
What is the minimum number of matching point required to identify an unknown latent print?
8
invisible print
latent print
visible print
patent print
4 stages of fingerprint analysis process?
1.) Analysis
2.) Comparison
3.) Verification
4.) Evauation
What is the origin of fingerprints?
unknown
