Soda can give false positives on one type of covid test

My thing this is calculated technique but what else could cause false positives accidentally. Think of all the positive but asymptomatic cases. I would find it hard to believe other tests are not open to mistake or a misinterpretation/reaction to certain variables

Or a negative test for that matter. Should add in the original op article it also mentions fruit can do the samething in many cases.
 

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