In one small pocket of Washington state, a devastating type of birth defect is occurring at rates that are off-the-charts. Almost all affected babies die shortly after birth. Some experts say that it's possible this is just a random cluster of horrible luck. But what if something in the environment is the culprit? State health officials say they've looked and found nothing. But there are serious questions being raised about that investigation. Senior Medical Correspondent Elizabeth Cohen has the story.
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