do these tests give false positives?

Question

I took this one yesterday. I thought it was positive then this morning I took one and it was negative.....

Answer

I’ve heard your more likely to get a false negative than positive. I’ve also heard some people say blue dye tests tend to run causing false positives.

Answer

I see it! I never got false positive on one unless it was after time frame then a line would show but not false within time

do these tests give false positives?

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