Browsing by Author "AHMED"

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    Persistence of semen on five different fabric types from four different water environments
    (UMT Lahore, 2021) AHMED
    Evidence collected from biological fluids obtained from a crime scene is essentially important in forensic cases. A potential profile can be generated from these obtained samples, and this can help in identifying the victims and/or suspects of sexual assault. The water environments selected for this study are all related to potential crime scenes from which there is a possibility of finding a dead body or clothing of a sexual assault victim. Tap water, river water, swimming pool water, and canal water were selected. Fabric types selected were khaddar, linen, silk, polyester, and chiffon. Detection of seminal stains was carried out by three methods: ALS, Acid Phosphatase (AP) testing, and Kernechtrot-Picro-indigo-carmine (KPIC) testing. These tests were performed for each fabric type in each water environment after regular intervals of 24h, 48h, 72h, 4 days, 7 days, and 14 days. Fluorescence was only detected in tap water-soaked silk fabric after 14 days of immersion. Seminal fluid was detected in khaddar, chiffon, silk, and polyester in samples immersed for 14 days in tap water. Spermatozoa were retained by khaddar and silk immersed in tap water, polyester fabric in tap and river water, chiffon in only river water, and linen in swimming pool water when immersed for 14 days. However, fluorescence, seminal fluid, or spermatozoa were not detected in linen fabric regardless of all the aforementioned variables. DNA analysis should not be disregarded even after 14 days post-assault when dealing with khaddar, silk, and especially chiffon and polyester fabrics on a crime scene.