Yeah, that's the fundamental problem with this kind of cheap, quick test - it's really hard to get good enough specificity to make them viable. This is part of

Yeah, that's the fundamental problem with this kind of cheap, quick test - it's really hard to get good enough specificity to make them viable. This is part of the reason the UK has rejected pretty much every such test it's tried, with Matt Hancock infamously declaring that "no test is better than a bad test" (though I think those tests were rather worse than this one).