Chapter 6 Fingerprints
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1 Chapter 6 Fingerprints By the end f this chapter yu will be able t: Discuss the histry f fingerprinting Describe the characteristics f fingerprints and fingerprinting minutiae Explain when and hw fingerprints frm Describe hw fingerprints can be left n bjects Identify the basic types f fingerprints Describe hw criminals attempt t alter their fingerprints 1 All Rights Reserved Suth-Western / Cengage Learning 2012, 2009 Frensic Science: Fundamentals & Investigatins, Chapter 6
2 Chapter 6 Fingerprints By the end f this chapter yu will be able t: Determine the reliability f fingerprints as a means f identificatin Describe the Integrated Autmated Fingerprint Identificatin System (IFAIS) Explain hw fingerprint evidence is cllected Describe the latest identificatin technlgies Determine if a fingerprint matches a fingerprint n recrd Use the prcess f lifting a latent print 2 Frensic Science: Fundamentals & Investigatins, Chapter 6
3 Histrical Develpment 1. 3rd century B.C. in China ldest knwn dcuments 2. Ancient Babyln ( B.C.) fingerprints pressed int clay tablets marked cntracts Dr. Nehemiah s paper describes the patterns n human hands, including the presence f ridges Jhann Mayer nted that the arrangement f skin ridges is never duplicated in tw persns 3 Frensic Science: Fundamentals & Investigatins, Chapter 6
4 Histrical Develpment Jan Evangelist Purkyn describes nine fingerprint patterns Sir William Herschel (right) began the cllectin f fingerprints and nted they were nt altered by age Alphnse Bertilln created a way t identify criminals that were repeat ffenders 4 Frensic Science: Fundamentals & Investigatins, Chapter 6
5 Histrical Develpment Sir Francis Galtn (r) and Sir Edmund Richard Henry develped the fingerprint classificatin system still used in the US Iván (Juan) Vucetich cllected all ten fingerprint impressins and nted measurements Sir Henry, with tw clleagues, created a system that divided fingerprints int grups. All ten fingerprints are imprinted n a card (called a ten card) alng with ther ntatins 5 Frensic Science: Fundamentals & Investigatins, Chapter 6
6 Example f a Ten Card 6 Frensic Science: Fundamentals & Investigatins, Chapter 6
7 What Are Fingerprints? 7 All fingers, tes, feet, and palms are cvered in small ridges Ridges help us grip bjects Ridges are arranged in cnnected units called dermal, r frictin, ridges Fingers accumulate natural secretins and dirt Fingers leave create prints n bjects we tuch Als knwn as dactylgrams Frensic Science: Fundamentals & Investigatins, Chapter 6
8 Structure f Skin 8 Frensic Science: Fundamentals & Investigatins, Chapter 6
9 Frmatin f Fingerprints Skin cnsists f: Inner layer dermis Outer layer epidermis Basal layer in between Basal layer grws faster than the layers abve and belw it Basal layer cllapses and flds t frm intricate shapes Fingerprints begin frming near the 10 th week f pregnancy 9 Frensic Science: Fundamentals & Investigatins, Chapter 6
10 Characteristics f Fingerprints There are 3 general fingerprint distinctins: 10 ARCH Abut 5% Ridges enter n ne side and exit n the ther. Frensic Science: Fundamentals & Investigatins, Chapter 6 WHORL Abut 30% f the ppulatin Cnsists f circles, mre than ne lp, r a mix f pattern types LOOP Abut 65% Ridges enter n ne side and exit n the same side.
11 Characteristics f Fingerprints Dactylscpy- the study f fingerprint identificatin Frensic examiners lk fr Cre (the center f a whrl r lp) Deltas (triangular regins near a lp) Ridge cunt Cunting frm the cre t the edge f the delta Distinguishes ne fingerprint frm anther 11 Frensic Science: Fundamentals & Investigatins, Chapter 6
12 Characteristics f Fingerprints 12 Frensic Science: Fundamentals & Investigatins, Chapter 6
13 Characteristics f Fingerprints 13 Frensic Science: Fundamentals & Investigatins, Chapter 6
14 Characteristics f Fingerprints Ulnar Lp (Right hand) Radial Lp (Right hand) 14 Ulnar lps pen twards the pinkie finger; Radial lps pen twards the thumb Frensic Science: Fundamentals & Investigatins, Chapter 6
15 Characteristics f Fingerprints Basic patterns can be further divided: Arch patterns: 4% plain 1% tented Whrl patterns: 2% central pcket 4% duble lp 0.01% accidental Even twins have unique fingerprints 15 Frensic Science: Fundamentals & Investigatins, Chapter 6
16 Fingerprint Minutiae Patterns 16 Frensic Science: Fundamentals & Investigatins, Chapter 6
17 Types f Fingerprints There are 3 types f prints that investigatrs lk fr at crime scenes: 1. Patent fingerprints visible prints transferred nt smth surfaces by bld r ther liquids 2. Plastic fingerprints indentatins left in sft materials such as clay r wax 3. Latent fingerprints made visible by dusting with pwders r the use f chemicals 17 Frensic Science: Fundamentals & Investigatins, Chapter 6
18 Fingerprint Frensic FAQs Hw are latent fingerprints cllected? 18 Frensic Science: Fundamentals & Investigatins, Chapter 6
19 Fingerprint Frensic FAQs Can fingerprints be erased? Only temprarily; they will grw back if remved with chemicals Is fingerprint identificatin reliable? Yes, but analysts can make mistakes Can cmputers perfrm matches in secnds? N, but the FBI s Integrated Autmated Fingerprint Identificatin System (IAFIS r AFIS) can prvide a match in 2 hurs 19 Frensic Science: Fundamentals & Investigatins, Chapter 6
20 The Future f Fingerprinting New scanning technlgies Yield detail in minute patterns Reduce analytical mistakes Analyze trace elements f bjects n the skin Technlgies that recgnize patterns in Retina Face Veins in yur palm 20 Frensic Science: Fundamentals & Investigatins, Chapter 6
21 Summary.... Fingerprints have lng been used fr identificatin, and in the mid-1800s were recgnized as unique t each persn. Three main grups include arches, whrls, and lps. Basic analysis includes lking fr cres and deltas and making a ridge cunt. 21 Frensic Science: Fundamentals & Investigatins, Chapter 6
22 Summary Investigatrs search fr patent, plastic, and latent prints. Dusting with pwders r using special chemicals can make latent fingerprints visible. New develpments may eliminate errrs by analysts. 22 Frensic Science: Fundamentals & Investigatins, Chapter 6
Chapter 6 Fingerprints By the end of this chapter you will be able to:
Chapter 6 Fingerprints By the end f this chapter yu will be able t: Discuss the histry f fingerprinting Describe the characteristics f fingerprints and fingerprinting minutiae Explain when and hw fingerprints
More informationChapter 6 Fingerprints By the end of this chapter you will be able to:
Chapter 6 Fingerprints By the end f this chapter yu will be able t: Discuss the histry f fingerprinting Describe the characteristics f fingerprints and fingerprinting minutiae Explain when and hw fingerprints
More informationChapter 6 Fingerprints
Chapter 6 Fingerprints Vcabulary: Arch: a fingerprint pattern in which the ridge pattern riginates frm ne side f the print and leaves frm the ther side Cre: Delta: a triangular ridge pattern with ridges
More informationForensic Science: Fundamentals & Investigations, 2e Chapter 6. All rights Reserved Cengage/NGL/South-Western 2016
1 Frensic Science: Fundamentals & Investigatins, 2e Cengage/NGL/Suth-Western 2016 Fingerprints By the end f this chapter yu will be able t: 6.1 Outline the histry f fingerprinting. 6.2 Describe the characteristics
More informationChapter 6 Fingerprints By the end of this chapter you will be able to:
Chapter 6 Fingerprints By the end of this chapter you will be able to: discuss the history of fingerprinting describe the characteristics of fingerprints and fingerprinting minutiae explain when and how
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Frensic Science: Fundamentals & Investigatins, e Cengage/NGL/Suth-Western 06 Fingerprints By the end f this chapter yu will be able t: 6. Outline the histry f fingerprinting. 6. Describe the characteristics
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