Should An Adopted Child Be Able To Locate The Birth Parents?

Children are put up for adoption for various reasons, often because the birth mother believes she will not be able to raise the child properly. Perhaps her family believes she is too young, perhaps she feels she is emotionally and financially incapable of caring for a child. Whatever the circumstances, it is an intensely personal decision. When a couple adopts an infant, they often choose to raise the child as their own, not revealing the true birth origins. So what happens when a child discovers they are adopted? Should they be able to locate the birth parents? Could that bring up a painful past for a mother or father who did not want to be found? Doesn't every person have a right to know who they come from, even if just for medical reasons to know hereditary traits? If you discover you're adopted, what happens if you find your birth parents and they don't want to know you?  How will the parents who raised you feel if you go seeking the people gave you up?