Recently, a number of laboratories in Europe, the United States and New Zealand have obtained results with SIR analysis that indicated apparent links from unconnected cases that had been processed in geographically different areas in different laboratories. Further investigation suggested that the DNA had been introduced during the process of manufacturing consumables and products used in the DNA analysis process. This was confirmed after comparing DNA profiles obtained from staff working in the plastic-ware factory and DNA profiles derived during the course of casework in the United Kingdom [1]. Contamination of disposable plastic-ware at a manufacturing source was originally suggested [2] in relation to the analysis of mitochondrial DNA. SWGDAM recommends that this position statement be limited to nuclear DNA.
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