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This case highlights the 'shades of grey' that come with forensic results. At some point, there needs to be an interpretation of the evidence, and the weight of the evidence towards the ultimate outcome.
Surrounding information / evidence can greatly assist in these situations, however where it is left to the domain of the forensic evidence alone, a degree of subjective assessment may need to be employed.
In this case, there does not appear to be any dispute around the actual forensic outcome, the issue is around the interpretation of that outcome.