Abstract
Sexual assault cases are the type of case that often produces questions about the cellular source of DNA. In these cases multiple findings of microscopy, DNA profiling and presumptive testing need to be considered when addressing source level propositions. In this work, I consider a line of questioning that has been raised a number of times in the recent past, where in court it was disputed that low levels of sperm seen on a microscope slide were the cellular source of the male DNA profile component generated from the sperm fraction of a differential DNA extraction. I demonstrate how the cell scoring results and DNA profiling results can be considered together, in helping address this source level question through the use of Bayesian Networks.
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