Evaluation of fingerprints determined on non-porous surfaces according to the medium conditions in theft


Thesis Type: Postgraduate

Institution Of The Thesis: Uludağ Üniversitesi, Turkey

Approval Date: 2017

Thesis Language: Turkish

Student: ERMAN KARABEY

Supervisor: GÜRCAN GÜLERYÜZ

Abstract:

The traces at the crime scene have an important role in illuminating the events. The detecting of the fingerprints have been affected by factors such as contamination, gender, trace surface, climate, environment, occupation and disease and psychological condition of person.The detection of new traces left at the crime scene are easier, than the detections of traces found much later after the incident.For this reason, how long the fingerprints will stay at the crime scene is important.In this thesis study, it has been compared by sex how much time and environmental conditions can affect the distinguishing characteristics of the fingerprints on non-porous surfaces such as glass, plastic, metal, nylon which are frequently encountered in theft.Fingerprints, obtained from various surfaces were monitored for 60 days depending on storage conditions under different environmental conditions.Super Glue, SPR, physical methods have been applied to concretize the traces on glass, metal, PVC and nylon surfaces.Fluorescence staining were applied to the traces on the PVC surface after Super Glue application.Then by photographing the traces, the distinguishing characteristics of the fingerprints were counted.As a result, in detection of the distinguishing characters on the fingerprint, different results were obtained according to various surface and environmental conditions. It has been found that when the materials stayed longer in the crime scene, the distinguishing characters on the fingerprint diminished.It was found that the dark environment was the best storage medium for fingerprints while the west-moist medium was to be insufficient for all surface.