[Strategerist]

Given that a chimera would still have very closely related DNA to himself I'm fairly confident that such a result would provoke more detailed testing. At the very least, they'd check if the guy had any brothers and whether they could be linked to the crime, at first.

It's not possible for a chimera to have different DNA completely unrelated to its other set of DNA.

[Question_Assumptions]

In the two cases detailed in that program, the DNA was so different that the DNA testers thought the woman wasn't the mother of her own children and they could only establish the relationship by looking at the woman's parents or siblings. If they can tell a mother that she's not the mother of her child, then I can imagine them claiming "no match" for a male chimera and a semen sample that's similarly different.