Three major causes of the high incidence of paternity fraud are
1: The woman having multiple partners: When a woman has sexual relationships with more than one partner within the same timeframe, this can lead to uncertainty about the biological father of the child conceived during this time.
2: The woman not understanding her menstrual cycle to accurately estimate the time of ovulation. Some women who have multiple partners and can't calculate their ovulation are not aware of who the father of their child is until a DNA test is done.
I think these two points are same, it's needless separating them. If a woman is faithful, whether she had sex during or after her ovulation, any pregnancy that arises from the sex will be a responsibility of the partner that she is faithful to.
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Since there is a means to go by in judging through the real owner of a child being born, we can always result for DNA test in doing that, but its such a pity that even in some areas where truth is far from being established in their endeavors, they will try to manipulate the DNA result and present a fake one through the influence of someone involved who is influential financially, truth is sometimes far away from any process we go through if we are not dealing with the right ones.
What is the cost of conducting an effective DNA test and how many average citizens can afford it in your country. Manipulating the DNA test is a secondary case that can be tackled by conducting the test in a different environment alien to both partners.