Dry bloodstain detection on various black fabric using forensic light sources

Blood is one of the most frequent and crucial biological methods used to identify and characterise criminals and regularly used to establishing a link between the offender, the victim, and the crime. Blood and bloodstain evidence in the form of fluids or stains found at the scene of a crime in la...

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Main Author:	Mohamed, Omar Osman
Format:	Thesis
Language:	English
Published:	2022
Subjects:	HV Social pathology Social and public welfare HV6251-6773.55 Crimes and offenses
Online Access:	http://eprints.usm.my/58501/1/OMAR%20OSMAN%20MOHAMED-24%20pages.pdf
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id	my-usm-ep.58501
record_format	uketd_dc
spelling	my-usm-ep.585012023-05-18T00:44:50Z Dry bloodstain detection on various black fabric using forensic light sources 2022-09 Mohamed, Omar Osman HV Social pathology. Social and public welfare HV6251-6773.55 Crimes and offenses Blood is one of the most frequent and crucial biological methods used to identify and characterise criminals and regularly used to establishing a link between the offender, the victim, and the crime. Blood and bloodstain evidence in the form of fluids or stains found at the scene of a crime in large quantities or in tiny amounts. This study investigates dried blood stain on the dark fabric of cotton, polyester, and mixed (cotton/polyester). This study looked into using Crime lite to photograph bloodstains to provide an alternative noninvasive tool. This study examined whether blood always absorbed light in the 300nm to 900nm range and the best wavelength for observing blood on black fabrics. It also investigated whether fabric type affected the ability to view blood on fabrics, if washing and drying the fabric affected the use of forensic light source (FLS) and if so, to what extent. Blood drops were deposited on three fabrics were photographed in the Crime-lite 2s FLS kit (Foster and Freeman) with and without a filter under 400-700nm (white light), 350nm- 380nm (UV), 400nm-430nm (Violet), 420nm-470nm (Blue), and 445nm-510nm (Blue green). The observation was optimized using positive control samples and violet light was selected. In total, 1132 photographs were in this entire study. Results indicated that photography with FLS was a viable non-destructive, chemical free and effective method for blood detection on dark fabrics. Furthermore, violet light with no filter was the most effective light source for viewing blood stains on dark fabrics without using chemicals. Using the violet light, washed fabric without detergent retain bloodstain for up to six cycles while fabric washed with detergent was only able to retain bloodstain in only two cycles 2022-09 Thesis http://eprints.usm.my/58501/ http://eprints.usm.my/58501/1/OMAR%20OSMAN%20MOHAMED-24%20pages.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Kesihatan
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	HV Social pathology Social and public welfare HV6251-6773.55 Crimes and offenses
spellingShingle	HV Social pathology Social and public welfare HV6251-6773.55 Crimes and offenses Mohamed, Omar Osman Dry bloodstain detection on various black fabric using forensic light sources
description	Blood is one of the most frequent and crucial biological methods used to identify and characterise criminals and regularly used to establishing a link between the offender, the victim, and the crime. Blood and bloodstain evidence in the form of fluids or stains found at the scene of a crime in large quantities or in tiny amounts. This study investigates dried blood stain on the dark fabric of cotton, polyester, and mixed (cotton/polyester). This study looked into using Crime lite to photograph bloodstains to provide an alternative noninvasive tool. This study examined whether blood always absorbed light in the 300nm to 900nm range and the best wavelength for observing blood on black fabrics. It also investigated whether fabric type affected the ability to view blood on fabrics, if washing and drying the fabric affected the use of forensic light source (FLS) and if so, to what extent. Blood drops were deposited on three fabrics were photographed in the Crime-lite 2s FLS kit (Foster and Freeman) with and without a filter under 400-700nm (white light), 350nm- 380nm (UV), 400nm-430nm (Violet), 420nm-470nm (Blue), and 445nm-510nm (Blue green). The observation was optimized using positive control samples and violet light was selected. In total, 1132 photographs were in this entire study. Results indicated that photography with FLS was a viable non-destructive, chemical free and effective method for blood detection on dark fabrics. Furthermore, violet light with no filter was the most effective light source for viewing blood stains on dark fabrics without using chemicals. Using the violet light, washed fabric without detergent retain bloodstain for up to six cycles while fabric washed with detergent was only able to retain bloodstain in only two cycles
format	Thesis
qualification_level	Master's degree
author	Mohamed, Omar Osman
author_facet	Mohamed, Omar Osman
author_sort	Mohamed, Omar Osman
title	Dry bloodstain detection on various black fabric using forensic light sources
title_short	Dry bloodstain detection on various black fabric using forensic light sources
title_full	Dry bloodstain detection on various black fabric using forensic light sources
title_fullStr	Dry bloodstain detection on various black fabric using forensic light sources
title_full_unstemmed	Dry bloodstain detection on various black fabric using forensic light sources
title_sort	dry bloodstain detection on various black fabric using forensic light sources
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Kesihatan
publishDate	2022
url	http://eprints.usm.my/58501/1/OMAR%20OSMAN%20MOHAMED-24%20pages.pdf
_version_	1776101225431826432

Dry bloodstain detection on various black fabric using forensic light sources

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