Fingerprinting

9/20/13

History of Fingerprinting

• 1924 in 1924, an act of congress established the

Identification Division of the FBI. The National Bureau and Leavenworth consolidated to form the nucleus of the FBI fingerprint files.

AFIS-Automated Fingerprint Identification System

• The FBI’S Integrated Automated Fingerprint Identification System (IAFIS) in Clarksburg, WV has more than 40 million individual computerized fingerprints records for known criminals

Fingerprints

• Form around 5 months gestation• Found in the dermis-middle layer of skin• Formed by the dermal papillae pushing up on

the epidermis

3 Types of Fingerprints: Arch, Loop, Whorl

• Arch: in an arch pattern, the ridges enter from one side, make a rise in the center and exist primarily on the opposite side.

Loops

• In a loop pattern, the ridges enter from either side, re-curve, and pass out or bend to pass out the same side they entered.

Fingerprint characterization

Types of Fingerprints at crime scenes

• Patent prints: prints easily seen such as left by blood or paint

• Plastic prints: found as impressions on wax or grease

• Latent prints: not visible to the naked eye.

Whorl

Classification: plain arch, Tented arch, loop, Plain whorl, central pocket whorl, Double Loop, Accidental

R. Thumb___________ L. Thumb__________R. Index_____________ L. Index____________R. Middle____________ L. Middle___________R. Ring______________ L. Ring______________R. Little______________ L. Little_____________

Characterization

Fingerprint characteristic

Agenda 10/1/13

Bell ringer: Application and Critically questions 1 and 2 p.504. fingerprints are on p.503Use p. 480 to answer p. 480Objective: students will use modified Henry classification system to classify own printsActivity: use page 480 to classify your own fingerprint

Writing prompt

• You are a forensic fingerprint identification expert who has been asked to give a expert testimony regarding a homicide in court

• R-Role (Expert)• A-Audience (court)• F-Format (report-hypothesis, investigation,

analysis and conclusion• T-Task ( determination of case-guilty/non-guilty)

0/15/13 Case Analysis questions p. 98, 1-5 Due Next Week Friday October 25Case Reading : Fiber Evidence and the Wayne Williams Trial p.100-107

Finger print Analysis

• Classify fingerprints as Arch, Loop and Whorl• Match Crime scene fingerprints to one of the

suspect• Characterization of CSI slide and suspect, find

at least five characters