Paternity test fraud: How to spot it

I was hoping someone might be able to offer some guidance here. I'm wondering if it’s actually possible for a paternity test to be manipulated—specifically, could a result come back claiming a man isn't the father when he actually is? I've heard some talk about people consuming certain foods or drinks that might somehow skew the findings toward a negative result.

If anyone has any insight into this, please let me know. I would truly appreciate it...

There is absolutely zero chance that anyone could rig that test!!!

Thanks so much...