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But how would one actually know if a result is a false positive or not?

Sure, in extreme cases it might be obvious, but if you just know that one test gives more matches than another, not knowing which one is the one giving false results?

But genetic evidence is often enough to convict by itself. A false positive is far more likely to land a conviction than an embarrassment to the prosecutor. I mean we live in a world where DNA evidence will easily override solid alibis.

A product that doesn't work wouldn't be considered.