Background: Commercial kits for Human Identification (HID) purposes, based on 15 short tandem repeat (STR) regions, allow the resolution of most forensic and paternity cases. However, some pitfalls arise in situations such as identification of missing persons, disaster victims, and in motherless paternities. We describe nine fortuitous matches found during the inclusion of new DNA profiles and/or searching for missing persons within a Mexican STR database (N = 2000). For these cases, we estimated both the likelihood ratio (LR) and the modified LR according to National Research Council (NRC) recommendations (i.e., LR NRC ).
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