I suspect that those waiting in line are checked in, and listed on a sheet(sequentially), and proceed to the tester(in line). But, when they unexpectedly depart the line, they are not crossed off the sheet (i.e. the checker isn't aware they left?), so the tester may be doing the swabs and recording them(sequentially)? Hence, the mix-ups? I'm not saying it's okay, but perhaps a flaw in procedure?
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