I think you need to be careful what you eat/drink before doing an LF - lot of false positives caused by fruit drinks etc.. apparently.
https://www.the-scientist.com/news-o...19-tests-68965
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I think you need to be careful what you eat/drink before doing an LF - lot of false positives caused by fruit drinks etc.. apparently.
https://www.the-scientist.com/news-o...19-tests-68965