How was blood deposited on garment dna technology has

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Unformatted text preview: • • • Whose blood is on garment? How was blood deposited on garment? DNA technology has assisted in DNA identification of whose blood is present present Chapter 12 32 32 Interpretations of Bloodstains on Interpretations Clothing and Footwear Clothing • Two categories of bloodstain Two deposition onto garments deposition • • Passive bloodstaining – transfer, flow Passive patterns, saturation stains, and stains from dripping blood from Active bloodstaining – impact spatter, Active arterial spurts, expirated bloodstains, and castoff. castoff. Chapter 12 33 33 Interpretations of Bloodstains on Interpretations Clothing and Footwear Clothing • • Take photomacrographs and Take photomicrographs of before cuttings or stains are removed stains Obtain a history of garment handling Obtain and where it has been – check for contamination or compromise of garment garment Chapter 12 34 34 The Use of Luminol Photography The for Bloodstain Pattern Analysis for Luminol is a chemiluminescent reagent Luminol that can be utilized both as a presumptive test for blood as well as a method of chemical enhancement of impressions in blood on various surfaces Used to check for latent prints or bloodstains where area has been cleaned by suspect or others cleaned Chapter 12 35 35 The Use of Luminol Photography The for Bloodstain Pattern Analysis for • • • • • Luminol is not specific for human blood- also Luminol reacts with animal blood reacts Should be used in darker conditions Special photography should be used – 35 Special mm camera with a wide open aperture – f-2.8 or f-3.5 with an exposure time of 40 to 80 seconds seconds Color film is preferred Photograph before and after application Chapter 12 36 36...
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This document was uploaded on 03/13/2014 for the course SCI 1901F at Clayton.

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