[BenLurkin]

Unsure mothers swab the inside of their child's mouth - and the mouth of the suspected father...

What do the unsure "fathers" do?

[Frank_2001]

“What do the unsure “fathers” do?”

Just shut up and pay the child support!;)

[Huntress]

Unsure mothers swab the inside of their child's mouth - and the mouth of the suspected father...

What do the unsure "fathers" do?

Collect the samples when the mother's not around. If the kid's not his, he should consider confronting mom with the results and consulting an attorney. If the kid is his, he should be a good father and never tell mom or the kid that he had the test done.