In such circumstances, if the child's ancestry is to be certified, a blood relationship to the guardian parents must be ruled out. The results of tests requested in cases of extramarital affairs show that nearly 30 % (28 % to be exact) of presumptive fathers are not in fact the biological father.
若依照受檢原因來檢視鑑定結果，在婚外情的個案中，竟有接近三成（28％）的假設父親被排除為生父，這結果足以讓偷腥的男人心生警惕。