Sexual assault cases can involve many questions about transfer and persistence of DNA
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Sexual assault cases can involve many questions about transfer and persistence of DNA. Sources of DNA can range from DNA transferred through grabbing/groping/digital penetration in the absence of a body fluid (such as the fingernail study) to transfer of DNA from multiple body fluid sources (blood, semen, saliva, and vaginal secretions).
Often the question at time of court is no longer focusing on “whose DNA is it?” or “what is the source” but instead focuses more on how did it get there and what does it mean in relation to the allegations.
In your readings you have read about the transfer of DNA. There has been examples of active transfer through scratching, or cunnilingus; there has been passive transfer through cohabitation and washing. There has been primary transfer with semen deposited directly onto swabs, and indirect, bidirectional transfer.
You have read about differential extractions, chemical and environmental insults (such as washing), the effect of the passage of time on spermatozoa retention, the impact of other body fluids (like vaginal secretions) and examples of mock degradation of DNA though the incubation at high temperatures.
You have read the papers with the purpose of identifying the primary and secondary purpose. You have seen examples of literature review to help inform opinions or predictions. You have read methods to identify body fluids and to extract, measure, and amplify DNA.
The final product of this course is going to be a research proposal in the form of a maximum 5- page paper structed similarly to the articles you have been reading. The research proposal will outline an experimental design to demonstrate the transfer and persistence of DNA and/or body fluids that will be able to provide real-world assistance to those looking to answer court questions in sexual assault cases. This final product will be due on/before the scheduled exam time period for this course (please note there is no exam. You will not be required to come to an exam class, you will have to ensure your final paper has been handed in by the end of that exam period).
However, to prepare you for that product and to ensure you are on the right track the first step is to submit a research proposal outline in the following format and it will be judged against the criteria outlined below.
What is the purpose of your
study?
Is there a secondary purpose of your study?
What real-world scenario will this apply to?
Give an example Hp Hd
What source(s) of DNA are you using?
How will you demonstrate primary/direct transfer?
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