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Fingerprints

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by

nermine ahmed

on 8 October 2014

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Transcript of Fingerprints

Fingerprints conditions
Fingerprints classification system
Fingerprints examination
Loop
Forensic and clinical toxicology
Assistant lecturer
Nermine Ahmed
Development & Importance
Introduction
Fingerprints comparison
Skin is formed of three main layers: epidermis, dermis,
and hypodermis
Fingerprints
Ridge formation begins by rapid proliferation of the basal layer of epidermis into the dermis
Ridges and valleys
Identification
Fingerprints are the most reliable method for ..........
Because:
1.
unique
pattern of friction ridges
2. Friction ridge skin is developed during the early intrauterine life and their form
does not change
throughout the person's life.
EXCEPT...........
3. It is be
deposited
on any touched object
Medicolegal importance of
dermatoglyphics
Dermatoglyphics
Pattern of skin ridges on the palm, fingers, sole and toes
Dactylography
Pattern of skin ridges at terminal phalanges of the fingers (fingerprints)
Inked fingerprints
Visible fingerprints
Latent/ Invisible fingerprints
Dust, dirt, blood, grease
Optical methods
Physical methods
Chemical methods
Moulded fingerprints
Arch
Plain arch
Tented arch
Ulnar loop
Radial loop
Whorl
Plain whorl
central pocket loop
Double loop whorl
Accidental
Minutiae
Pattern
Arch
Loop
Whorl
Pores
small ridge characteristics
Automated fingerprint identefication system (AFIS)
Manual comparison
fingerprints:






Criminal
Identification of assailant or victim
Sole prints
new borns
pilots

Palm prints
:
medical diseases with congenital or genetic origin
CIVIL:

Military
Marraige
Application of job
signature of illiterate

Mass disaster
Patent:
inked
visible
moulded
Latent

sweat
Water soluble
Water insoluble
Aminoacids
salts
large sized protein
Fat
Ninhydrin
Silver nitrate
Physical developer
oil red 0
Surfaces
Porous
Non porous
Steps of collection and analysis of fingerprints
1. Recovery and visualization
2. Lifting and preservation
3. Examination
4.comparison
Full transcript