Module 11 Case Study Answers

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Experimental Protocol

In this study, they wanted to mimic crime scene interactions, evidence handling, and evidence analyzing as closely to the real world as possible. They started by asking two different police districts their cleaning procedures and evidence handling.
Wipe test Any look at contamination would be remiss without taking a first look into cleaning or, specifically, cleaning procedures! The study looked at two different police districts in Norway, and an important thing to note was that there was no standard universal procedure regarding washing/cleaning up after examining exhibits or evidence taken from crime scenes. The one thing they had in common was washing examination tables and floors, but there was no specific cleaning attention paid to regularly touched spots. In one district, examinations involving blood stains were followed with a cleaning regime of Rely+On Vircon; otherwise, household soap was used. In contrast, ethanol wipes were the chosen implement of …show more content…

In light of police procedure of handling and examining evidence before DNA analysis, it is speculated that this contamination could be due to environmental DNA via multiple transfers from gloves to exhibits. In contrast, domestic contamination could arise from inadequate protective equipment such as infrequently changed gloves or even indirect transfer from the outside of evidence bags (rare at 0.0024% vs contamination by police at 0.04%). New profiling systems may have increased the detection rate of contamination events, and police protocols fall short of matching the new standards required. Even though police contamination events increased, NIPH contamination has been on the decline with the main risk coming from before the bag even sets an anthropomorphized foot in the

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