Asked to explain how that could have happened, PathWest scientist Scott Egan said it was likely to be a"manual handling issue" or"operator error".
The same batch of micro centrifuge tubes were used for both cases, Mr Egan said, and one of them was probably"contaminated with that unrelated case sample" and then used to store an extract from the twig.The journey towards reasonable doubt He said this would have likely happened because he wasn't wearing a face mask when he prepared glass slides from the samples in April 1997.
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