What is the percentage of dna paternity try-out person wrong and why did it vote he be the father the second time?

i took it why did it say he was the father the second time when we did testing to see if he be my sons father but first time it was 0%
Answers:    Well like the first poster said, the home DNA tests aren't reliable. too much randomness of contamination. I'd trust a state or court ordered DNA test done properly in a lab.
was it a state paternity theory test or a at home one?
i heard the $99 paternity tests are a scam

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