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such as hemophilia is only passed down from parenen to the child if the child is a boy. if the test shows it's a girl, expensive genetic testing can be avoided altogether. >> i think there's a potential medical good for this. i think there's a potential for this to be misused. i'm concerned about that. >> reporter: some worry these test might influence them to have an abortion if it's not what they hope for. >> we have to make sure that we say as a society, it isn't right to end a pregnancy just because you don't like the gender of your baby. >> r rorter: it's important to realize the blood test is in addition to and not in lieu of the ultrasound or other prenatal tests. linsey davis, abc news, new york. >> and when we come back on the broadcast tonight -- what happened 50 years ago today and that moment peter jennings witnessed, all of those years later. yeah, dirt? do you think the two of us will ever find the one?