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Earl Attlee to ask Her Majesty's Government whether they, or their agencies, regularly determine the operational false positive rates for polymerase chain reaction tests carried out at each laboratory undertaking analysis for mass COVID-19 testing; whether they use an ‘end to end’ method to audit those rates; if not, what methodology they use to make such determinations; and whether those methods include inserting samples into the system that cannot be positive. HL10846
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