I think there should be a DNA test required at birth of every child.Thousands of men that are married are raising kids they believe to be theirs when they really arent.Married or not the test should be required then there is no doubt as to paternity.Might cut back on some of the married women and men screwing around too.
I know two men that are paying child support even though the children arent theirs.
If you are married its usually automatically awarded regardless and if the father wasnt married at the time but just accepted responsibility it was his child without asking for DNA test they usually have to pay.