Abstract
Cold case reinvestigations are a common occurrence. Occasionally some of the original work was conducted up to 30 years ago using profiling systems of the early 1990s, which targeted HLA-DQA1, ApoB, D1S80 and D17S5. When contemporary work is carried out, if a suspect is identified they will be profiled in contemporary profiling kits such as GlobalFiler. It would be common to then also attempt to profile the evidence profiles in the same contemporary profiling kit. Imagine a scenario where two evidence samples, E1 and E2, had previously produced single-source profiles, but only E2 had any DNA extract left to re-profile with GlobalFiler. At the old loci E1 matched E2, and at the new loci E2 matched the suspect reference. Of interest to the investigation was whether anything could be said about the suspect being a donor of DNA to E1 even though the reference of the suspect and the profile from E1 had no loci in common, by using the information from the profile of E2. This paper explores that possibility.
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