fingerprint identification
TRANSCRIPT
WHORLWHORL
LOOPLOOP
RIDGERIDGE
BIFURCATIO
N
BIFURCATIO
N
ENDING
RIDGEENDING
RIDGE
DOT
DOT DELTADELTA
CORECORE
IDENTIDENT
NON-IDENTNON-IDENT
ARCHARCH
FINGERPRINT COMPARISONFINGERPRINT COMPARISON
Facial Characteristics
Voice Recognition
DNA / Genetic Profile
Osteology (bones)
Odontology (teeth)
Facial Characteristics
Voice Recognition
DNA / Genetic Profile
Osteology (bones)
Odontology (teeth)
FORMS OF IDENTIFICATIONFORMS OF IDENTIFICATION
“Fingerprints”“Fingerprints”
FORMS OF IDENTIFICATIONFORMS OF IDENTIFICATION
WHY FINGERPRINTS?WHY FINGERPRINTS?
Fingerprint evidence is the most positive investigative means for identifying people.
Fingerprint evidence is the most positive investigative means for identifying people.
Fingerprints form on a person before birth and remain unchanged until the body decomposes after death.
Fingerprints form on a person before birth and remain unchanged until the body decomposes after death.
Every fingerprint is unique!Every fingerprint is unique!
WHAT IS A FINGERPRINT?WHAT IS A FINGERPRINT?
A fingerprint is a pattern of friction ridge details, that are comprised of ridges and valleys.
A Ridge – is a high.
A Valley – is a depression or low.
A fingerprint is a pattern of friction ridge details, that are comprised of ridges and valleys.
A Ridge – is a high.
A Valley – is a depression or low.
Friction ridges are also found on our palms, feet and toes.Friction ridges are also found on our palms, feet and toes.
RidgeRidgeValleyValley
THE PATTERNTHE PATTERN
The pattern is the unique characteristics of the ridges and valleys that make up the print. It is defined by the spatial relationship of lines with each other, their beginning and terminating points, and the unique pattern they make. The genes from our parents determine the general characteristics of the patterns.
The pattern is the unique characteristics of the ridges and valleys that make up the print. It is defined by the spatial relationship of lines with each other, their beginning and terminating points, and the unique pattern they make. The genes from our parents determine the general characteristics of the patterns.
1. What are fingerprints?1. What are fingerprints?Recorded impressions of the friction ridges located on the surface of the finger. Recorded impressions of the friction ridges located on the surface of the finger.
2. What is the purpose of fingerprint identification?2. What is the purpose of fingerprint identification?
To establish the identity or non-identity of two sets of fingerprints. To establish the identity or non-identity of two sets of fingerprints.
FINGERPRINT IDENTIFICATIONFINGERPRINT IDENTIFICATION
FINGERPRINT IDENTIFICATIONFINGERPRINT IDENTIFICATION
3. What are fingerprint characteristics? 3. What are fingerprint characteristics?
These are also known as ridge detail, points of identification, or identifying characteristics.These are also known as ridge detail, points of identification, or identifying characteristics.
A. Ending RidgesB. BifurcationsC. DotsD. EnclosuresE. Short Ridges
A. Ending RidgesB. BifurcationsC. DotsD. EnclosuresE. Short Ridges
4. How are fingerprints compared?4. How are fingerprints compared?
A. Fingerprints are compared by noting the ridge characteristics on two prints to determine whether or not they match.
B. An identification is established when a number of these characteristics occupy the same relative position on the two prints.
A. Fingerprints are compared by noting the ridge characteristics on two prints to determine whether or not they match.
B. An identification is established when a number of these characteristics occupy the same relative position on the two prints.
FINGERPRINT IDENTIFICATIONFINGERPRINT IDENTIFICATION
5. How many points of identification (characteristics) are sufficient to establish an identification?
5. How many points of identification (characteristics) are sufficient to establish an identification?
A. No set standard number required.A. No set standard number required.
B. Left to each individual fingerprint examiner.B. Left to each individual fingerprint examiner.
C. Deciding factors:C. Deciding factors:
1. Clarity of impressions1. Clarity of impressions
2. Uniqueness of formations2. Uniqueness of formations
3. Fingerprint examiners experience and ability3. Fingerprint examiners experience and ability
FINGERPRINT IDENTIFICATIONFINGERPRINT IDENTIFICATION
POINTS OF IDENTIFICATION
POINTS OF IDENTIFICATION
• United States No Set Numbe
• England 16
• France 17
• Germany 12
• United States No Set Numbe
• England 16
• France 17
• Germany 12
NOTE: As many as 150 ridge characteristic can be noted in the average fingerprint.
NOTE: As many as 150 ridge characteristic can be noted in the average fingerprint.
6. Be extremely cautious!6. Be extremely cautious!
The integrity of the identification process depends on the fingerprint examiner devoting his or her attention to comparison work at all times.
The integrity of the identification process depends on the fingerprint examiner devoting his or her attention to comparison work at all times.
A. Always be certain that the fingerprints have been printed in the proper finger blocks.
B. Be absolutely certain of your decision
A. Always be certain that the fingerprints have been printed in the proper finger blocks.
B. Be absolutely certain of your decision
FINGERPRINT IDENTIFICATIONFINGERPRINT IDENTIFICATION
RIDGE CHARACTERISTICS RIDGE CHARACTERISTICS
COMMONCOMMON OCCASIONALOCCASIONAL RARERARE
Ending RidgeEnding Ridge
BifurcationBifurcation
DotDot
EnclosureEnclosure
“T” Junction“T” Junction
Short RidgeShort Ridge
TrifurcationTrifurcation
Ridge CrossingRidge Crossing
Row of DotsRow of Dots
RIDGE CHARACTERISTICS MAGNIFIEDRIDGE CHARACTERISTICS MAGNIFIED
Points 1, 2, 4, 5 are Ending RidgesPoints 1, 2, 4, 5 are Ending Ridges
Points 8, 10, 11 are BifurcationsPoints 8, 10, 11 are Bifurcations
Point 7 Short RidgePoint 7 Short Ridge
Points 3 and 9 are DotsPoints 3 and 9 are Dots
Point 6 is an Enclosure (ISLAND)Point 6 is an Enclosure (ISLAND)
11
22
44
55
88
10101111
99
77
33
66
HOW TO COMPARE FINGERPRINTSHOW TO COMPARE FINGERPRINTS
• By noting the ridge characteristics in two fingerprint impressions to determine whether or not they match.
• An identification is established when a number of characteristics occupy the same relative position in the two fingerprint impressions.
• First observation should be the pattern type.A. Loops - 65%B. Whorls - 30%C. Arches – 5%
• By noting the ridge characteristics in two fingerprint impressions to determine whether or not they match.
• An identification is established when a number of characteristics occupy the same relative position in the two fingerprint impressions.
• First observation should be the pattern type.A. Loops - 65%B. Whorls - 30%C. Arches – 5%
• Second observation should be to examine the line of flow.A. Right B. Left
• Third observation should be fingerprint characteristics. Looking for the most obvious point(s) of identification (i.e., what captures your eye first).
• Second observation should be to examine the line of flow.A. Right B. Left
• Third observation should be fingerprint characteristics. Looking for the most obvious point(s) of identification (i.e., what captures your eye first).
HOW TO COMPARE FINGERPRINTSHOW TO COMPARE FINGERPRINTS
• Fourth observation is to ensure the characteristics are in the same relative position. A. Count from one characteristic to another.B. Look for characteristics that are alike.
Remember that inking, pressure, occupation, failure to roll fingerprints nail to nail and scars can change the appearance of characteristics.
• Fourth observation is to ensure the characteristics are in the same relative position. A. Count from one characteristic to another.B. Look for characteristics that are alike.
Remember that inking, pressure, occupation, failure to roll fingerprints nail to nail and scars can change the appearance of characteristics.
HOW TO COMPARE FINGERPRINTSHOW TO COMPARE FINGERPRINTS
HOW TO COMPARE FINGERPRINTSHOW TO COMPARE FINGERPRINTS
• Fifth observation is to ensure that the fingerprints are in sequential order by checking the plain impressions with the rolled impressions.
• Never non-ident fingerprints using only one finger. This will help eliminate errors.
• Flat or Plain impressions taken simultaneously give a true or better reading of how the ridges actually appear.
• Fifth observation is to ensure that the fingerprints are in sequential order by checking the plain impressions with the rolled impressions.
• Never non-ident fingerprints using only one finger. This will help eliminate errors.
• Flat or Plain impressions taken simultaneously give a true or better reading of how the ridges actually appear.
Not Fully Inked or RolledNot Fully Inked or Rolled
FINGERPRINT COMPARISONPlain or Flat Impressions
FINGERPRINT COMPARISONPlain or Flat Impressions
FINGERPRINT COMPARISONFINGERPRINT COMPARISON
FINGERPRINT COMPARISONFINGERPRINT COMPARISON
FINGERPRINT COMPARISONFINGERPRINT COMPARISON
FINGERPRINT COMPARISONFINGERPRINT COMPARISON
“THINGS TO REMEMBER”“THINGS TO REMEMBER”
• Look for the obvious characteristics• Utilize the entire fingerprint• Never base your decision on a scar• Never non-ident by one finger only• Ensure sequence is correct• Unable when not 100% positive of decision• Utilize existing enhancement tools• Take sufficient time to process• Avoid distractions & beware of complacency• Maintain good work habits
• Look for the obvious characteristics• Utilize the entire fingerprint• Never base your decision on a scar• Never non-ident by one finger only• Ensure sequence is correct• Unable when not 100% positive of decision• Utilize existing enhancement tools• Take sufficient time to process• Avoid distractions & beware of complacency• Maintain good work habits
QUESTIONS?QUESTIONS?