The Houston PD DNA lab The analysts never ran extraction blanks (and didnt understand why they should) until around 1999, then did so sporadically The analysts never ran extraction blanks (and didnt understand why they should) until around 1999, then did so sporadically The analysts who performed DNA extractions were not trained to do PCR and had no understanding of the sensitivity and contamination issues The analysts who performed DNA extractions were not trained to do PCR and had no understanding of the sensitivity and contamination issues
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